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Ecological site R102AY003SD

Subirrigated

Last updated: 6/27/2024
Accessed: 11/23/2024

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General information

Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.

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Figure 1. Mapped extent

Areas shown in blue indicate the maximum mapped extent of this ecological site. Other ecological sites likely occur within the highlighted areas. It is also possible for this ecological site to occur outside of highlighted areas if detailed soil survey has not been completed or recently updated.

MLRA notes

Major Land Resource Area (MLRA): 102A–Rolling Till Prairie

The Rolling Till Prairie (102A) is located within the Central Feed Grains and Livestock Land Resource Region. It spans 3 states (Minnesota 58 percent, South Dakota 42 percent, and small part in North Dakota), encompassing over 16,000 square miles (Figure 1). The elevation ranges from approximately over 2,000 feet above sea level (ASL) on the Prairie Coteau in Northeastern South Dakota to about 1,000 feet ASL on lowlands. The dominate landform in this area are stagnation moraines, end moraines, glacial outwash plains, terraces, and flood plains. The area is dominated by till covered moraines. The stagnation moraines are gently undulating to steep and have many depressions and poorly defined drainages. Small outwash areas are adjacent to the watercourses. The Cretaceous Pierre Shale underlies the till in the most of the area. Precambrian rocks also occur at depth. Granite is quarried near Milbank, South Dakota and outcrops of Sioux Quartzite are common. (USDA-NRCS 2006).

The dominant soil order in this MLRA is Mollisols. The soils in the area dominantly have a frigid soil temperature regime, an aquic or udic soil moisture regime, and mixed mineralogy. They generally are very deep, well drained to very poorly drained. This area supports true prairie vegetation characterized by big bluestem (Andropogon gerardii), little bluestem (Schizachyrium scoparium), porcupinegrass (Hesperostipa spartea), and green needlegrass (Nassella viridula). Prairie cordgrass (Spartina pectinata) commonly grows in wet areas. (USDA-NRCS 2006).

Classification relationships

Major Land Resource Area (MLRA): Rolling Till Prairie (102A) (USDA-NRCS 2006)

USFS Subregions: North Central Glaciated Plains Section (251B); Upper Minnesota River-Des Moines Lobe Subsection (251Ba); Outer Coteau des Prairies Subsection (251Bb); Northwest Iowa Plains Subsection (251Bd); Minnesota and Northeast Iowa Morainal-Oak Savannah Section (222M); Alexandria Moraine-Hardwood Hills Subsection (222Ma) (Cleland et al. 2007).

US EPA Level IV Ecoregion: Tewaukon/Big Stone Stagnation Moraine (46e), Prairie Coteau (46k), Prairie Coteau Escarpment (46l), Big Sioux Basin (46m), Minnesota River Prairie (46o), Des Moines Lobe (47b) , Lake Agassiz Plains (48d), Alexandria Moraines and Detroit Lakes Outwash Plain (51j) (USEPA 2013)

Ecological site concept

The Subirrigated ecological site typically occurs in drainageways which can receive moderate run off moisture from within the watershed. Soils are formed in alluvium and are somewhat poorly drained, which have a water table within 2 to 5 feet of the soil surface that persists longer than the wettest part of the growing season typically until the month of August. Vegetation in the Reference State is dominated by warm season grasses including big bluestem, Indiangrass, and switchgrass. Grass-like species occurring on this site may include clustered field sedge. Forbs present may include goldenrod, cudweed sagewort, asters, and western yarrow. Non-native species such as Kentucky bluegrass and smooth brome may invade the site due to changes in disturbance regime.

Associated sites

R102AY006SD	Limy Subirrigated These sites occur along the edges of drainageways. Soils are somewhat poorly drained which have a water table within 2 to 5 feet of the soil surface that persists longer than the wettest part of the growing season typically until the month of August. Soils will effervesce with acid at or near the surface. The central concept soil series is Cubden, Hamerly, McKranz, but other series are included.
R102AY020SD	Loamy Overflow These sites occur in upland swales. Soils are moderately well drained which have water flow into and over/through the site. The central concept soil series is Aastad, Brookings, Svea, and Waubay but other series are included.
R102AY004SD	Wet Meadow These sites occur in a basin or closed depression. Soils are poorly drained and the site ponds water for 4 to 8 weeks in the spring of the year or after a heavy rain. The central concept soil series is Tonka, but other series are included.

R102AY006SD

Limy Subirrigated

These sites occur along the edges of drainageways. Soils are somewhat poorly drained which have a water table within 2 to 5 feet of the soil surface that persists longer than the wettest part of the growing season typically until the month of August. Soils will effervesce with acid at or near the surface. The central concept soil series is Cubden, Hamerly, McKranz, but other series are included.

R102AY020SD

Loamy Overflow

These sites occur in upland swales. Soils are moderately well drained which have water flow into and over/through the site. The central concept soil series is Aastad, Brookings, Svea, and Waubay but other series are included.

R102AY004SD

Wet Meadow

These sites occur in a basin or closed depression. Soils are poorly drained and the site ponds water for 4 to 8 weeks in the spring of the year or after a heavy rain. The central concept soil series is Tonka, but other series are included.

Similar sites

R102AY006SD	Limy Subirrigated The Limy Subirrigated site occurs along the edges of drainageways. Soils are similar in drainage class and water table, but will effervesce with acid at or near the surface. A Limy subirrigated site will have less big bluestem, more little bluestem and lower production than a Subirrigated site.

R102AY006SD

Limy Subirrigated

The Limy Subirrigated site occurs along the edges of drainageways. Soils are similar in drainage class and water table, but will effervesce with acid at or near the surface. A Limy subirrigated site will have less big bluestem, more little bluestem and lower production than a Subirrigated site.

Table 1. Dominant plant species

Tree	Not specified
Shrub	Not specified
Herbaceous	(1) Andropogon gerardii (2) Sorghastrum nutans

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Physiographic features

The Subirrigated ecological site typically occurs in drainageways.

Table 2. Representative physiographic features

Landforms	(1) Drainageway
Flooding duration	Brief (2 to 7 days)
Flooding frequency	Frequent
Ponding duration	Long (7 to 30 days)
Ponding frequency	None to occasional
Elevation	305 – 610 m
Slope	1 – 2%
Ponding depth	0 – 30 cm
Water table depth	30 – 152 cm
Aspect	Aspect is not a significant factor

Climatic features

MLRA 102A is considered to have a continental climate – cold winters and relatively hot summers, low to moderate humidity, light rainfall, and much sunshine. Extremes in temperature may also abound. The climate is the result of this MLRA’s location near the geographic center of North America. There are few natural barriers on the Northern Great Plains and air masses move freely across the plains and account for rapid changes in temperature.

Annual precipitation typically ranges from 21 to 27 inches per year. The average annual temperature is about 43°F. January is the coldest month with average temperatures ranging from about 5°F (Mahnomen 1 W, Minnesota (MN)), to about 14°F (Tracy, MN). July is the warmest month with temperatures averaging from about 69°F (Mahnomen 1 W, MN), to about 73°F (Tracy, MN). The range of normal average monthly temperatures between the coldest and warmest months is about 62°F. This large annual range attests to the continental nature of this area's climate. Hourly winds are estimated to average about 11 miles per hour (mph) annually, ranging from about 13 mph during the spring to about 10 mph during the summer. Daytime winds are generally stronger than nighttime and occasional strong storms may bring brief periods of high winds with gusts to more than 50 mph.

Growth of cool-season plants begins in early to mid-March, slowing or ceasing in late June. Warm-season plants begin growth about mid-May and continue to early or mid-September. Greenup of cool-season plants may occur in September and October when adequate soil moisture is present.

Table 3. Representative climatic features

Frost-free period (characteristic range)	111-128 days
Freeze-free period (characteristic range)	136-151 days
Precipitation total (characteristic range)	635-711 mm
Frost-free period (actual range)	99-131 days
Freeze-free period (actual range)	130-153 days
Precipitation total (actual range)	610-711 mm
Frost-free period (average)	120 days
Freeze-free period (average)	143 days
Precipitation total (average)	660 mm

Characteristic range

Actual range

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Figure 2. Monthly precipitation range

Characteristic range

Actual range

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Figure 3. Monthly minimum temperature range

Characteristic range

Actual range

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Figure 4. Monthly maximum temperature range

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Figure 5. Monthly average minimum and maximum temperature

Figure 6. Annual precipitation pattern

Figure 7. Annual average temperature pattern

Climate stations used

(1) FOSSTON 1 E [USC00212916], Fosston, MN
(2) MAHNOMEN [USC00215012], Mahnomen, MN
(3) ROY LAKE [USC00397326], Lake City, SD
(4) MILBANK 4 NW [USC00395536], Milbank, SD
(5) CLARK [USC00391739], Clark, SD
(6) ARTICHOKE LAKE [USC00210287], Correll, MN
(7) MORRIS WC EXP STN [USC00215638], Hancock, MN
(8) MELROSE [USC00215325], Melrose, MN
(9) BENSON [USC00210667], Benson, MN
(10) CLEAR LAKE [USC00391777], Clear Lake, SD
(11) ARLINGTON 1 W [USC00390281], Arlington, SD
(12) TYLER [USC00218429], Tyler, MN
(13) TRACY [USC00218323], Tracy, MN
(14) LAKE WILSON [USC00214534], Lake Wilson, MN
(15) PIPESTONE [USC00216565], Pipestone, MN
(16) BROOKINGS 2 NE [USC00391076], Brookings, SD
(17) BROWNS VALLEY [USC00211063], Beardsley, MN
(18) CASTLEWOOD [USC00391519], Castlewood, SD
(19) FERGUS FALLS [USC00212768], Fergus Falls, MN
(20) MILAN 1 NW [USC00215400], Milan, MN
(21) SISSETON [USC00397742], Sisseton, SD
(22) SUMMIT 1 W [USC00398116], Summit, SD
(23) WATERTOWN 1W [USC00398930], Watertown, SD
(24) WEBSTER [USC00399004], Webster, SD

Soil features

The Subirrigated ecological site typically occurs in drainageways. Soils are somewhat poorly drained which have a water table within 2 to 5 feet of the soil surface that persists longer than the wettest part of the growing season typically until the month of August. The central concept soil series is Badger, but others are included.

Table 4. Representative soil features

Surface texture	(1) Loam (2) Silty clay loam (3) Sandy loam
Family particle size	(1) Loamy
Drainage class	Somewhat poorly drained
Permeability class	Slow to moderately rapid
Soil depth	203 cm
Surface fragment cover <=3"	0 – 12%
Surface fragment cover >3"	0 – 2%
Available water capacity (0-101.6cm)	10.16 – 20.32 cm
Calcium carbonate equivalent (0-101.6cm)	0 – 25%
Electrical conductivity (0-101.6cm)	0 – 4 mmhos/cm
Sodium adsorption ratio (0-101.6cm)	0 – 3
Soil reaction (1:1 water) (0-101.6cm)	6.6 – 8.4
Subsurface fragment volume <=3" (Depth not specified)	0 – 12%
Subsurface fragment volume >3" (Depth not specified)	0 – 3%

Ecological dynamics

The site which is located in the Prairie Pothole Region developed under Northern Great Plains climatic conditions and included natural influence of large herding herbivores and occasional fire. Changes will occur in the plant communities due to weather fluctuations and/or management actions. Under adverse impacts, a relatively rapid decline in vegetative vigor and composition can occur. Under favorable conditions the site has the potential to resemble the Reference State. Interpretations for this site are based primarily on the 1.1 Big Bluestem-Indiangrass-Switchgrass Plant Community Phase. This community phase and the Reference State have been determined by study of rangeland relic areas, areas protected from excessive disturbance, and areas under long-term rotational grazing regimes. Trends in plant community dynamics ranging from heavily grazed to lightly grazed areas, seasonal use pastures, and historical accounts also have been considered.

This ecological site (ES) has been grazed by domestic livestock since they have been introduced into the area. The introduction of domestic livestock and the use of fencing and reliable water sources have changed the ecological dymanics of this site. Heavy continuous grazing causes Kentucky bluegrass (Poa pratentsis) to invade and eventually develop into a sod condition. Extended periods of nonuse and no fire will result in a plant community having high litter levels, which favors an increase in Kentucky bluegrass and smooth bromegrass (Bromus inermis). In time, shrubs such as western snowberry (Symphoricarpos occidentalis) will also increase.

Following the state and transition diagram are narratives for each of the described states and community phases. These may not represent every possibility, but they are the most prevalent and repeatable states/community phases. The plant composition tables shown below have been developed from the best available knowledge at the time of this revision. As more data are collected, some of these community phases and/or states may be revised or removed, and new ones may be added. The main purpose for including the descriptions here is to capture the current knowledge and experience at the time of this revision.

State and transition model

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Ecosystem states

1. Reference State

2. Native/Invaded State

3. Invaded State

4. Crop Production State

T1A	-	non-use and/or no surface fire and/or heavy continuous grazing or invasion
T1B	-	Tillage
T2A	-	Non-use and/or no surface fire, or heavy continuous grazing
T2C	-	Tillage
R3A	-	Long-term prescribed grazing, prescribed burning, seeding
T3	-	Tillage
R4A	-	Seeding
R4B	-	Seeding, Cropping followed by abandonment

State 1 submodel, plant communities

1.1. Big Bluestem-Indiangrass-Switchgrass

1.2. Clustered Field Sedge-Big Bluestem-Switchgrass-Forbs

1.1A	-	Heavy continuous grazing
1.2A	-	Prescribed grazing and/or prescribed burning

State 2 submodel, plant communities

2.1. Big Bluestem-Indiangrass-Switchgrass

2.2. Clustered Field Sedge-Big Bluestem-Kentucky Bluegrass-Switchgrass

2.1A	-	Heavy continuous grazing
2.2A	-	Prescribed grazing

State 3 submodel, plant communities

3.1. Smooth Bromegrass-Kentucky Bluegrass-Little Bluestem

3.2. Kentucky Bluegrass-Spike Rush-Forbs

3.3. Annual Pioneer-Perennial Pioneer

3.1A	-	Heavy continuous grazing
3.2A	-	Prescribed grazing
3.3A	-	Time w/wo disturbances

State 4 submodel, plant communities

4.1. Annual Crops

State 1
Reference State

The Reference State represents the natural range of variability that dominates the dynamics of this ES. This state is typically dominated by warm-season grass and grass-like species. Before European settlement, the primary disturbance mechanisms for this site in the reference condition included periodic fire, grazing by large herding ungulates, and fluctuations in the water table and ponding frequency and duration. Frequent surface fires (3 to 5 years) and grazing coupled with weather events dictated the dynamics that occurred within the natural range of variability. Today, the primary disturbance is from a lack of fire, concentrated livestock grazing, and weather fluctuations. Species that are desirable for livestock and wildlife can decline and a corresponding increase in less desirable species will occur.

Community 1.1
Big Bluestem-Indiangrass-Switchgrass

Interpretations are based primarily on the 1.1 Big Bluestem-Indiangrass-Switchgrass Plant Community Phase (this is also considered to be climax). This plant community evolved with grazing by large herbivores, frequent surface fires, and periodic flooding events and is suited for grazing by domestic livestock. This plant community can be found on areas that are grazed and where the grazed plants receive adequate periods of rest during the growing season in order to recover. The potential vegetation was about 80 percent grasses or grass-like plants, 15 percent forbs, and 5 percent shrubs. The community was dominated by warm-season grasses. The major grasses included big bluestem, Indiangrass, and switchgrass. Other grass or grass-like species included little bluestem (Schizachyrium scoparium), prairie cordgrass (Spartina pectinata), Canada wildrye (Elymus canadensis), sideoats grama (Bouteloua curtipendula), prairie dropseed (Sporobolus heterolepis), slender wheatgrass (Elymus trachycaulus), and sedge (Carex). This plant community was resilient and well adapted to the Northern Great Plains climatic conditions. The diversity in plant species allowed for high drought tolerance. This was a sustainable plant community in regards to site/soil stability, watershed function, and biologic integrity. This is a sustainable plant community in terms of soil stability, watershed function, and biologic integrity.

Figure 8. Annual production by plant type (representative values) or group (midpoint values)

Table 5. Annual production by plant type

Plant type	Low (kg/hectare)	Representative value (kg/hectare)	High (kg/hectare)
Grass/Grasslike	4562	5235	5750
Forb	258	605	1076
Shrub/Vine	112	212	347
Total	4932	6052	7173

Figure 9. Plant community growth curve (percent production by month). SD0205, Rolling Till Prairie, warm-season dominant.. Warm-season dominant..

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
J	F	M	A	M	J	J	A	S	O	N	D
0	0	2	5	15	25	30	15	7	1	0	0

Community 1.2
Clustered Field Sedge-Big Bluestem-Switchgrass-Forbs

This plant community evolved under heavy continuous grazing or from over utilization during extended drought periods. The potential plant community was made up of approximately 80 percent grasses and grass-like species, 15 percent forbs, and 5 percent shrubs. Dominant grass and grass-like species included clustered field sedge (Carex praegracilis), big bluestem, and switchgrass. Grass and grass-like species of secondary importance included Indiangrass, slender wheatgrass, plains bluegrass (Poa arida), little bluestem, rush (Juncaceace), and Canada wildrye. Forbs commonly found in this plant community included goldenrod (Solidago), cudweed sagewort (Artemisia ludoviciana), heath aster (Symphyotrichum ericoides), Indian hemp (Apocynum cannabinum), and western yarrow (Achillea millefolium). This plant community had similar plant composition to the 2.2 Sedge-Bluestem-Kentucky Bluegrass-Switchgrass Plant Community Phase. The main difference is that this plant community phase did not have the presence of non-native invasive grass species. When compared to the 1.1 Big Bluestem-Indiangrass-Switchgrass Plant Community Phase, sedges, plains bluegrass, and grass-like species increased. Production of tall warm-season grasses was reduced. This plant community was moderately resistant to change. The herbaceous species present were well adapted to grazing; however, species composition could be altered through long-term overgrazing. If the herbaceous component was intact, it tended to be resilient if the disturbance was not long-term. Most of the components of the ecological processes would have been functioning at optimum levels. However, the vigor and reproductive capability of the tall warm-season grasses would have been reduced due to grazing pressure or a combination of stressors. A reduction of this dominant functional group allowed for an increase in shorter-statured (and shallower rooted) species.

Figure 10. Plant community growth curve (percent production by month). SD0204, Rolling Till Prairie, warm-season dominant, cool-season subdominant.. Warm-season dominant, cool-season subdominant..

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
J	F	M	A	M	J	J	A	S	O	N	D
0	0	3	7	17	25	25	15	7	1	0	0

Pathway 1.1A
Community 1.1 to 1.2

Pathway 1.2A
Community 1.2 to 1.1

Prescribed Grazing, and/or prescribed burning returned to normal disturbance regime levels and frequencies or periodic light to moderate grazing possibly including periodic rest would have converted this plant community to the 1.1 Big Bluestem-Indiangrass-Switchgrass Plant Community Phase.

State 2
Native/Invaded State

This state represents the more common range of variability that exists with higher levels of grazing management but in the absence of periodic fire due to fire suppression. This state is dominated by warm-season grasses. It can be found on areas that are properly managed with grazing and/or prescribed burning, and sometimes on areas receiving occasional short periods of rest. Taller warm-season species can decline and a corresponding increase in short statured grass will occur.

Community 2.1
Big Bluestem-Indiangrass-Switchgrass

This plant community phase is similar to the 1.1 Big Bluestem-Indiangrass-Switchgrass Plant Community Phase, but it also contains minor amounts of nonnative invasive grass species such as Kentucky bluegrass and smooth bromegrass (up to about 10 percent by air-dry weight). The potential vegetation is about 80 percent grasses or grass-like plants, 15 percent forbs, and 5 percent shrubs. The community is dominated by warm-season grasses. The major grasses include big bluestem, Indiangrass, and switchgrass. Other grass or grass-like species include little bluestem, prairie cordgrass, Canada wildrye, sideoats grama, prairie dropseed, slender wheatgrass, and sedges. This plant community is resilient and well adapted to the Northern Great Plains climatic conditions. The diversity in plant species allows for high drought tolerance. This is a sustainable plant community in regards to site/soil stability, watershed function, and biologic integrity.

Figure 11. Plant community growth curve (percent production by month). SD0205, Rolling Till Prairie, warm-season dominant.. Warm-season dominant..

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
J	F	M	A	M	J	J	A	S	O	N	D
0	0	2	5	15	25	30	15	7	1	0	0

Community 2.2
Clustered Field Sedge-Big Bluestem-Kentucky Bluegrass-Switchgrass

This plant community is a result of heavy continuous grazing or from over utilization during extended drought periods. The potential plant community is made up of approximately 80 percent grasses and grass-like species, 15 percent forbs, and 5 percent shrubs. Dominant grass and grass-like species include clustered field sedge, big bluestem, Kentucky bluegrass, and switchgrass. Grass and grass-like species of secondary importance include Indiangrass, slender wheatgrass, plains bluegrass, little bluestem, rush, and Canada wildrye. Forbs commonly found in this plant community included goldenrod, cudweed sagewort, heath aster, Indian hemp, and western yarrow. When compared to the 1.1 Big Bluestem-Indiangrass-Switchgrass Plant Community Phase, sedge, plains bluegrass, and grass-like species increased. Kentucky bluegrass has also invaded. Production of tall warm-season grasses was reduced. This plant community is moderately resistant to change. The herbaceous species present are well adapted to grazing; however, species composition can be altered through long-term overgrazing. If the herbaceous component is intact, it tends to be resilient if the disturbance is not long-term. Most of the components of the ecological processes are functioning at optimum levels. However, the vigor and reproductive capability of the tall warm-season grasses are reduced due to grazing pressure or a combination of stressors. A reduction of this dominant functional group allows for an increase in shorter-statured (and shallower rooted) species. The introduction of nonnative invasive species such as Kentucky bluegrass and smooth bromegrass (Bromus inermis) results in alterations to the soil profile. Organic matter levels tend to decrease and begin to be concentrated more in the surface layers and the structure will begin to be modified. These changes favor the shallow rooted species and hasten their eventual dominance if steps are not taken to reduce these species.

Figure 12. Annual production by plant type (representative values) or group (midpoint values)

Table 6. Annual production by plant type

Plant type	Low (kg/hectare)	Representative value (kg/hectare)	High (kg/hectare)
Grass/Grasslike	3335	4096	4713
Forb	207	471	846
Shrub/Vine	45	141	269
Total	3587	4708	5828

Figure 13. Plant community growth curve (percent production by month). SD0204, Rolling Till Prairie, warm-season dominant, cool-season subdominant.. Warm-season dominant, cool-season subdominant..

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
J	F	M	A	M	J	J	A	S	O	N	D
0	0	3	7	17	25	25	15	7	1	0	0

Pathway 2.1A
Community 2.1 to 2.2

Heavy continuous grazing which includes herbivory at moderate to heavy levels at the same time of year each year without adequate recovery periods, or during periods of below normal precipitation when grazing frequency and intensity increases on these sites due to limited forage availability on adjacent upland sites and no surface fire for extended periods of time (typically for 10 years or more) causing litter levels to become high enough to reduce native grass vigor, diversity, and density will shift this community to the 2.2 Clustered Field Sedge-Big Bluestem-Kentucky Bluegrass-Switchgrass Plant Community Phase.

Pathway 2.2A
Community 2.2 to 2.1

Prescribed grazing (alternating season of use and providing adequate recovery periods) or periodic light to moderate grazing possibly including periodic rest will convert this plant community to the 2.1 Big Bluestem-Indiangrass-Switchgrass Plant Community Phase.

Conservation practices

Prescribed Grazing

State 3
Invaded State

This state is a result of encroachment mainly by invasive introduced cool-season grasses. The ecological processes are not functioning, especially the biotic processes and the hydrologic functions. The introduced cool-season grasses cause reduced infiltration and increased runoff. Preliminary studies would tend to indicate this threshold may exist when Kentucky bluegrass exceeds 30 percent of the plant community and native grasses represent less than 40 percent of the plant community composition. The opportunity for high intensity spring burns is severely reduced by early greenup and increased moisture and humidity at the soil surface, and grazing pressure cannot cause a reduction in sodgrass dominance. Production is limited to the sod forming species. Infiltration continues to decrease and runoff increases and energy capture into the system is restricted to early season low producing species. Nutrient cycling is limited by root depth of the dominant species.

Community 3.1
Smooth Bromegrass-Kentucky Bluegrass-Little Bluestem

This plant community phase is a result of extended periods of nonuse and no fire or occasionally light levels of grazing over several years. It is characterized by dominance of smooth bromegrass, Kentucky bluegrass, and little bluestem. The dominance is at times so complete that other species are difficult to find on the site. A thick duff layer also accumulates at or above the soil surface and eventualy a thatch-mat layer may develop at the surface. Nutrient cycling is greatly reduced and native plants have great difficulty becoming established. When dominated by smooth bromegrass, infiltration is moderately reduced and runoff is moderate. Production can be equal to or higher than the interpretive plant community. However, when dominated by Kentucky bluegrass, infiltration is greatly reduced and runoff is high. Production in this case will likely be significantly less. In either case, the period that palatability is high is relatively short as these cool-season species mature rapidly. Energy capture is also reduced. The dominance of these introduced species has been shown to alter the biotic component of the soil, as well as, organic matter levels and eventually the soil structure. These alterations perpetuate the dominance of Kentucky bluegrass and smooth bromegrass and tend to make establishment of native species extremely difficult.

Figure 14. Annual production by plant type (representative values) or group (midpoint values)

Table 7. Annual production by plant type

Plant type	Low (kg/hectare)	Representative value (kg/hectare)	High (kg/hectare)
Grass/Grasslike	3979	4815	5554
Forb	230	404	639
Shrub/Vine	50	161	308
Total	4259	5380	6501

Figure 15. Plant community growth curve (percent production by month). SD0201, Rolling Till Prairie, cool-season dominant.. Cool-season dominant..

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
J	F	M	A	M	J	J	A	S	O	N	D
0	0	4	12	25	36	10	5	4	4	0	0

Community 3.2
Kentucky Bluegrass-Spike Rush-Forbs

This plant community phase is a result of heavy, continuous seasonal grazing or heavy, continuous season-long grazing. It is characterized by a dominance of Kentucky bluegrass, grass-like species, and forbs. The dominance is at times so complete that other species are difficult to find on the site. A relatively thick duff layer can sometimes accumulate at or above the soil surface and eventually a thatch-mat layer may develop at the surface. Nutrient cycling is greatly reduced and native plants have great difficulty becoming established. Infiltration is greatly reduced and runoff is high. Production will be significantly reduced when compared to the interpretive plant community. The period that palatability is high is relatively short as Kentucky bluegrass matures rapidly. Energy capture is also reduced. Biological activity in the soil is likely reduced significantly in this phase.

Figure 16. Annual production by plant type (representative values) or group (midpoint values)

Table 8. Annual production by plant type

Plant type	Low (kg/hectare)	Representative value (kg/hectare)	High (kg/hectare)
Grass/Grasslike	2315	2909	3379
Forb	151	420	807
Shrub/Vine	–	34	73
Total	2466	3363	4259

Figure 17. Plant community growth curve (percent production by month). SD0201, Rolling Till Prairie, cool-season dominant.. Cool-season dominant..

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
J	F	M	A	M	J	J	A	S	O	N	D
0	0	4	12	25	36	10	5	4	4	0	0

Community 3.3
Annual Pioneer-Perennial Pioneer

This plant community developed under continuous heavy grazing or other excessive disturbances. The potential plant community is made up of approximately 40 to 80 percent grasses and grass-like species, 20 to 60 percent forbs, and 0 to 5 percent shrubs. The species present in this phase are highly variable, but often include nonnative invasive and/or early seral species. Plant diversity is low (plant richness may be high but areas are often dominated by a few species). The ecological processes are difficult to restore because of the loss of plant diversity and overall soil disturbance. Soil erosion is potentially very high because of the bare ground and shallow rooted herbaceous plant community. Water runoff will increase and infiltration will decrease due to animal related soil compaction and loss of root mass due to low plant diversity and vigor. This plant community will require significant economic inputs and time to move towards another plant community. This movement is highly variable in its succession. This is due to the loss of diversity (including the loss of the seed bank), within the existing plant community, and the plant communities on adjacent sites.

Pathway 3.1A
Community 3.1 to 3.2

Heavy continuous grazing which includes herbivory at moderate to heavy levels at the same time of year each year without adequate recovery periods, or during periods of below normal precipitation when grazing frequency and intensity increases on these sites due to limited forage availability on adjacent upland sites and no surface fire for extended periods of time (typically for 10 years or more) causing litter levels to become high enough to reduce native grass vigor, diversity, and density will shift this community to the 3.2 Kentucky Bluegrass-Spike Rush-Forbs Plant Community Phase.

Pathway 3.2A
Community 3.2 to 3.1

Prescribed grazing (alternating season of use and providing adequate recovery periods) or periodic light to moderate grazing possibly including periodic rest may convert this plant community to the 3.1 Smooth Bromegrass-Kentucky Bluegrass-Little Bluestem Plant Community Phase.

Conservation practices

Prescribed Grazing

Pathway 3.3A
Community 3.3 to 3.2

This community pathway occurs with the passage of time as successional processes take place and perennial plants gradually begin to establish on the site again. This pathway will lead to the 3.2 Kentucky Bluegrass-Spike Rush-Forbs Plant Community Phase.

State 4
Crop Production State

This state is characterized by the production of annual crops using a variety of tillage and cropping systems along with management practices.

Community 4.1
Annual Crops

This plant community developed with the use of a variety of tillage systems and cropping systems for the production of annual crops including corn, soybeans, wheat, sugar beet and a variety of other crops.

Transition T1A
State 1 to 2

Non-use and/or no surface fire for extended periods of time (typically for 10 or more years) causing litter levels to become high enough to reduce native grass vigor, diversity, and density, and/or heavy continuous grazing or invasion of non-native plant species will likely lead this state over a threshold resulting in the Native-Invaded State (State 2).

Transition T4
State 1 to 3

Encroachment of non-native invasive/noxious species, abandonment of cropping, or seeding of introduced and/or native improved varieties of forage species may lead this plant community phase over a threshold to the Invaded State (State 3) and more specifically to the 3.3 Annual/Pioneer, Non-native Perennial Plant Community Phase. In the case of a seeding, refer to the corresponding Forage Suitability Group (FSG) description for adapted species and expected production (production estimates in the FSG description may be unrealistically high due to the degraded condition of the site at this phase).

Transition T1B
State 1 to 4

Tillage will cause a shift over a threshold leading to the 3.1 Annual Crops Plant Community Phase within the Crop Production State (State 4).

Transition T2A
State 2 to 3

Non-use and/or no surface fire for extended periods of time (typically for 10 or more years) causing litter levels to become high enough to reduce native grass vigor, diversity, and density, will likely lead this state over a threshold leading to the 3.1 Smooth Bromegrass-Kentucky Bluegrass-Little Bluestem Plant Community Phase within the Invaded State (State 3). Heavy continuous grazing (stocking levels well above carrying capacity for extended portions of the growing season and often at the same time of year each year), will likely lead this state over a threshold leading to the 3.2 Kentucky Bluegrass-Spike Rush-Forbs Plant Community Phase within the Invaded State (State 3). Grazing repeatedly in the early growing season can expedite this shift by causing mechanical disturbance due to trampling.

Transition T2C
State 2 to 4

Tillage will cause a shift over a threshold leading to the 4.1 Annual Crops Plant Community Phase within the Crop Production State (State 4).

Restoration pathway R3A
State 3 to 2

Long-term prescribed grazing (moderate stocking levels coupled with adequate recovery periods, or other grazing systems such as high-density, low-frequency intended to treat specific species dominance, or periodic light to moderate stocking levels possibly including periodic rest) coupled with prescribed burning may lead this 3.1 Smooth Bromegrass-Kentucky Bluegrass-Little Bluestem Plant Community Phase within the Invaded State (State 3) over a threshold to the Native/Invaded State (State 2). Seeding followed by Long-term prescribed grazing (moderate stocking levels coupled with adequate recovery periods, or other grazing systems such as high-density, low-frequency intended to treat specific species dominance, or periodic light to moderate stocking levels possibly including periodic rest) may lead this Invaded State (State 3) over a threshold to the Native/Invaded State (State 2).

Conservation practices

Prescribed Grazing

Transition T3
State 3 to 4

Tillage will cause a shift over a threshold leading to the 4.1 Annual Crops Plant Community Phase within the Crop Production State (State 4).

Restoration pathway R4A
State 4 to 2

Seeding may lead this Crop Production State (State 4) over a threshold to the Native/Invaded State (State 2).

Restoration pathway R4B
State 4 to 3

Seeding may lead this Crop Production State (State 4) over a threshold to the Invaded State (State 3). Cropping followed by abandonment may lead this plant community phase over a threshold to the 3.3 Annual Pioneer- Perennial Pioneer Plant Community Phase within the Invaded State (State 3).

Additional community tables

Table 9. Community 1.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production (kg/hectare)	Foliar cover (%)
Grass/Grasslike
1	Tall Warm-season Grasses			1513–3632
	big bluestem	ANGE	Andropogon gerardii	605–2724	–
	Indiangrass	SONU2	Sorghastrum nutans	605–2724	–
	switchgrass	PAVI2	Panicum virgatum	121–1211	–
	prairie cordgrass	SPPE	Spartina pectinata	61–605	–
2	Cool-season Grasses			303–908
	Canada wildrye	ELCA4	Elymus canadensis	61–605	–
	slender wheatgrass	ELTR7	Elymus trachycaulus	61–303	–
	plains bluegrass	POAR3	Poa arida	61–182	–
	common rivergrass	SCFE	Scolochloa festucacea	61–182	–
	prairie wedgescale	SPOB	Sphenopholis obtusata	0–182	–
	northern reedgrass	CASTI3	Calamagrostis stricta ssp. inexpansa	61–182	–
3	Mid Warm-season Grasses			303–908
	little bluestem	SCSC	Schizachyrium scoparium	303–908	–
	prairie dropseed	SPHE	Sporobolus heterolepis	61–303	–
	sideoats grama	BOCU	Bouteloua curtipendula	61–303	–
4	Grass-likes			303–908
	clustered field sedge	CAPR5	Carex praegracilis	61–605	–
	Sartwell's sedge	CASA8	Carex sartwellii	61–605	–
	manyhead sedge	CASY	Carex sychnocephala	61–605	–
	rush	JUNCU	Juncus	61–303	–
	Grass-like (not a true grass)	2GL	Grass-like (not a true grass)	0–182	–
5	Other Native Grasses			0–61
	Graminoid (grass or grass-like)	2GRAM	Graminoid (grass or grass-like)	0–303	–
	Scribner's rosette grass	DIOLS	Dichanthelium oligosanthes var. scribnerianum	0–61	–
	fall rosette grass	DIWI5	Dichanthelium wilcoxianum	0–61	–
Forb
6	Forbs			303–908
	Forb, native	2FN	Forb, native	61–182	–
	Maximilian sunflower	HEMA2	Helianthus maximiliani	61–182	–
	western yarrow	ACMIO	Achillea millefolium var. occidentalis	61–121	–
	tall blazing star	LIAS	Liatris aspera	61–121	–
	Canadian anemone	ANCA8	Anemone canadensis	61–121	–
	Indianhemp	APCA	Apocynum cannabinum	61–121	–
	white sagebrush	ARLU	Artemisia ludoviciana	61–121	–
	purple prairie clover	DAPU5	Dalea purpurea	61–121	–
	goldenrod	SOLID	Solidago	61–121	–
	white heath aster	SYER	Symphyotrichum ericoides	61–121	–
	New England aster	SYNO2	Symphyotrichum novae-angliae	61–121	–
	American licorice	GLLE3	Glycyrrhiza lepidota	0–121	–
	prairie violet	VIPE2	Viola pedatifida	0–61	–
	meadow zizia	ZIAP	Zizia aptera	0–61	–
	smooth horsetail	EQLA	Equisetum laevigatum	0–61	–
	Virginia strawberry	FRVI	Fragaria virginiana	0–61	–
	closed bottle gentian	GEAN	Gentiana andrewsii	0–61	–
	downy gentian	GEPU5	Gentiana puberulenta	0–61	–
	milkweed	ASCLE	Asclepias	0–61	–
	bluebell bellflower	CARO2	Campanula rotundifolia	0–61	–
	palespike lobelia	LOSP	Lobelia spicata	0–61	–
	rough bugleweed	LYAS	Lycopus asper	0–61	–
	Norwegian cinquefoil	PONO3	Potentilla norvegica	0–61	–
	upright prairie coneflower	RACO3	Ratibida columnifera	0–61	–
	blackeyed Susan	RUHI2	Rudbeckia hirta	0–61	–
	blue-eyed grass	SISYR	Sisyrinchium	0–61	–
	Cuman ragweed	AMPS	Ambrosia psilostachya	0–61	–
	common goldstar	HYHI2	Hypoxis hirsuta	0–61	–
Shrub/Vine
7	Shrubs			121–303
	leadplant	AMCA6	Amorpha canescens	61–182	–
	false indigo bush	AMFR	Amorpha fruticosa	0–121	–
	rose	ROSA5	Rosa	61–121	–
	willow	SALIX	Salix	0–121	–
	Shrub (>.5m)	2SHRUB	Shrub (>.5m)	0–121	–

Table 10. Community 2.2 plant community composition

Group	Common name	Symbol	Scientific name	Annual production (kg/hectare)	Foliar cover (%)
Grass/Grasslike
1	Tall Warm-season Grasses			471–1412
	big bluestem	ANGE	Andropogon gerardii	235–1177	–
	switchgrass	PAVI2	Panicum virgatum	235–942	–
	Indiangrass	SONU2	Sorghastrum nutans	0–471	–
	prairie cordgrass	SPPE	Spartina pectinata	0–235	–
2	Cool-season Grasses			94–471
	plains bluegrass	POAR3	Poa arida	94–377	–
	slender wheatgrass	ELTR7	Elymus trachycaulus	0–330	–
	Canada wildrye	ELCA4	Elymus canadensis	0–235	–
	northern reedgrass	CASTI3	Calamagrostis stricta ssp. inexpansa	0–47	–
3	Mid Warm-season Grasses			0–471
	little bluestem	SCSC	Schizachyrium scoparium	0–471	–
	sideoats grama	BOCU	Bouteloua curtipendula	0–141	–
4	Grass-likes			235–1412
	clustered field sedge	CAPR5	Carex praegracilis	47–942	–
	Sartwell's sedge	CASA8	Carex sartwellii	47–942	–
	manyhead sedge	CASY	Carex sychnocephala	47–942	–
	rush	JUNCU	Juncus	47–377	–
	Grass-like (not a true grass)	2GL	Grass-like (not a true grass)	0–141	–
5	Other Native Grasses			0–235
	Graminoid (grass or grass-like)	2GRAM	Graminoid (grass or grass-like)	0–235	–
	Scribner's rosette grass	DIOLS	Dichanthelium oligosanthes var. scribnerianum	0–47	–
	fall rosette grass	DIWI5	Dichanthelium wilcoxianum	0–47	–
6	Non-Native Grasses			471–1177
	Kentucky bluegrass	POPR	Poa pratensis	235–942	–
	smooth brome	BRIN2	Bromus inermis	47–471	–
	timothy	PHLEU	Phleum	0–377	–
	creeping bentgrass	AGST2	Agrostis stolonifera	0–377	–
Forb
7	Forbs			235–706
	Forb, introduced	2FI	Forb, introduced	0–235	–
	Indianhemp	APCA	Apocynum cannabinum	47–188	–
	white sagebrush	ARLU	Artemisia ludoviciana	47–188	–
	goldenrod	SOLID	Solidago	47–188	–
	white heath aster	SYER	Symphyotrichum ericoides	47–188	–
	New England aster	SYNO2	Symphyotrichum novae-angliae	47–141	–
	American licorice	GLLE3	Glycyrrhiza lepidota	0–141	–
	Forb, native	2FN	Forb, native	47–141	–
	western yarrow	ACMIO	Achillea millefolium var. occidentalis	47–141	–
	Cuman ragweed	AMPS	Ambrosia psilostachya	47–141	–
	milkweed	ASCLE	Asclepias	0–94	–
	purple prairie clover	DAPU5	Dalea purpurea	47–94	–
	smooth horsetail	EQLA	Equisetum laevigatum	0–94	–
	tall blazing star	LIAS	Liatris aspera	0–94	–
	Norwegian cinquefoil	PONO3	Potentilla norvegica	0–47	–
	upright prairie coneflower	RACO3	Ratibida columnifera	0–47	–
	Maximilian sunflower	HEMA2	Helianthus maximiliani	0–47	–
	Canadian anemone	ANCA8	Anemone canadensis	0–47	–
Shrub/Vine
8	Shrubs			47–235
	Shrub (>.5m)	2SHRUB	Shrub (>.5m)	0–94	–
	leadplant	AMCA6	Amorpha canescens	0–94	–
	rose	ROSA5	Rosa	47–94	–
	willow	SALIX	Salix	0–47	–
	false indigo bush	AMFR	Amorpha fruticosa	0–47	–

Table 11. Community 3.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production (kg/hectare)	Foliar cover (%)
Grass/Grasslike
1	Tall Warm-season Grasses			0–538
	big bluestem	ANGE	Andropogon gerardii	0–538	–
	switchgrass	PAVI2	Panicum virgatum	0–269	–
	prairie cordgrass	SPPE	Spartina pectinata	0–269	–
2	Cool-season Grasses			54–807
	slender wheatgrass	ELTR7	Elymus trachycaulus	0–538	–
	plains bluegrass	POAR3	Poa arida	54–538	–
	Canada wildrye	ELCA4	Elymus canadensis	0–108	–
3	Mid Warm-season Grasses			0–538
	little bluestem	SCSC	Schizachyrium scoparium	0–430	–
	sideoats grama	BOCU	Bouteloua curtipendula	0–161	–
4	Grass-likes			269–1076
	clustered field sedge	CAPR5	Carex praegracilis	0–807	–
	Sartwell's sedge	CASA8	Carex sartwellii	0–807	–
	manyhead sedge	CASY	Carex sychnocephala	0–807	–
	rush	JUNCU	Juncus	0–377	–
	Grass-like (not a true grass)	2GL	Grass-like (not a true grass)	0–269	–
5	Other Native Grasses			0–269
	Graminoid (grass or grass-like)	2GRAM	Graminoid (grass or grass-like)	0–269	–
	Scribner's rosette grass	DIOLS	Dichanthelium oligosanthes var. scribnerianum	0–54	–
	fall rosette grass	DIWI5	Dichanthelium wilcoxianum	0–54	–
6	Non-Native Grasses			1076–2959
	smooth brome	BRIN2	Bromus inermis	807–2690	–
	Kentucky bluegrass	POPR	Poa pratensis	269–1345	–
	creeping bentgrass	AGST2	Agrostis stolonifera	0–538	–
	timothy	PHLEU	Phleum	0–538	–
Forb
7	Forbs			269–538
	Forb, introduced	2FI	Forb, introduced	54–215	–
	Forb, native	2FN	Forb, native	0–161	–
	Cuman ragweed	AMPS	Ambrosia psilostachya	54–161	–
	Indianhemp	APCA	Apocynum cannabinum	54–161	–
	white sagebrush	ARLU	Artemisia ludoviciana	54–161	–
	American licorice	GLLE3	Glycyrrhiza lepidota	0–161	–
	western yarrow	ACMIO	Achillea millefolium var. occidentalis	54–108	–
	goldenrod	SOLID	Solidago	54–108	–
	white heath aster	SYER	Symphyotrichum ericoides	54–108	–
	New England aster	SYNO2	Symphyotrichum novae-angliae	54–108	–
	tall blazing star	LIAS	Liatris aspera	0–54	–
	rough bugleweed	LYAS	Lycopus asper	0–54	–
	upright prairie coneflower	RACO3	Ratibida columnifera	0–54	–
	milkweed	ASCLE	Asclepias	0–54	–
	bluebell bellflower	CARO2	Campanula rotundifolia	0–54	–
	purple prairie clover	DAPU5	Dalea purpurea	0–54	–
	smooth horsetail	EQLA	Equisetum laevigatum	0–54	–
Shrub/Vine
8	Shrubs			54–269
	willow	SALIX	Salix	0–161	–
	rose	ROSA5	Rosa	0–108	–
	Shrub (>.5m)	2SHRUB	Shrub (>.5m)	0–108	–
	leadplant	AMCA6	Amorpha canescens	0–54	–
	false indigo bush	AMFR	Amorpha fruticosa	0–54	–

Table 12. Community 3.2 plant community composition

Group	Common name	Symbol	Scientific name	Annual production (kg/hectare)	Foliar cover (%)
Grass/Grasslike
1	Tall Warm-season Grasses			0–101
	big bluestem	ANGE	Andropogon gerardii	0–101	–
	switchgrass	PAVI2	Panicum virgatum	0–101	–
2	Cool-season Grasses			0–235
	slender wheatgrass	ELTR7	Elymus trachycaulus	0–168	–
	plains bluegrass	POAR3	Poa arida	0–168	–
3	Mid Warm-season Grasses			0–101
	little bluestem	SCSC	Schizachyrium scoparium	0–101	–
4	Grass-likes			168–673
	rush	JUNCU	Juncus	67–504	–
	clustered field sedge	CAPR5	Carex praegracilis	0–168	–
	Sartwell's sedge	CASA8	Carex sartwellii	0–168	–
	manyhead sedge	CASY	Carex sychnocephala	0–168	–
	Grass-like (not a true grass)	2GL	Grass-like (not a true grass)	0–101	–
5	Other Native Grasses			0–168
	Graminoid (grass or grass-like)	2GRAM	Graminoid (grass or grass-like)	0–168	–
	Scribner's rosette grass	DIOLS	Dichanthelium oligosanthes var. scribnerianum	0–34	–
	fall rosette grass	DIWI5	Dichanthelium wilcoxianum	0–34	–
6	Non-Native Grasses			673–2354
	Kentucky bluegrass	POPR	Poa pratensis	336–2018	–
	timothy	PHLEU	Phleum	0–504	–
	creeping bentgrass	AGST2	Agrostis stolonifera	0–504	–
	smooth brome	BRIN2	Bromus inermis	0–269	–
Forb
7	Forbs			168–673
	Forb, introduced	2FI	Forb, introduced	336	–
	white sagebrush	ARLU	Artemisia ludoviciana	34–269	–
	goldenrod	SOLID	Solidago	34–269	–
	western yarrow	ACMIO	Achillea millefolium var. occidentalis	34–235	–
	Cuman ragweed	AMPS	Ambrosia psilostachya	34–235	–
	white heath aster	SYER	Symphyotrichum ericoides	34–168	–
	New England aster	SYNO2	Symphyotrichum novae-angliae	34–168	–
	Forb, native	2FN	Forb, native	0–67	–
	Indianhemp	APCA	Apocynum cannabinum	0–34	–
	smooth horsetail	EQLA	Equisetum laevigatum	0–34	–
	American licorice	GLLE3	Glycyrrhiza lepidota	0–34	–
Shrub/Vine
8	Shrubs			0–67
	Shrub (>.5m)	2SHRUB	Shrub (>.5m)	0–67	–
	rose	ROSA5	Rosa	0–67	–

Interpretations

Animal community

Animal Community – Grazing Interpretations
The following table lists annual, suggested initial stocking rates with average growing conditions. These are conservative estimates that should be used only as guidelines in the initial stages of conservation planning. Often, the current plant composition does not entirely match any particular plant community (as described in this ES description). Because of this, a resource inventory is necessary to document plant composition and production. More accurate carrying capacity estimates should eventually be calculated using the following stocking rate information along with animal preference data and actual stocking records, particularly when grazers other than cattle are involved. With consultation of the land manager, more intensive grazing management may result in improved harvest efficiencies and increased carrying capacity.

Big Bluestem/Indiangrass/Switchgrass (1.1 & 2.1)
Average Annual Production (lbs./acre, air-dry):
5400
Stocking Rate* (AUM/acre): 1.48

Sedge/Bluestem/Kentucky Bluegrass/Switchgrass (2.2)
Average Annual Production (lbs./acre, air-dry):
4200
Stocking Rate* (AUM/acre): 1.15

Smooth Bromegrass/Kentucky Bluegrass/Bluestem (3.1)
Average Annual Production (lbs./acre, air-dry):
4800
Stocking Rate* (AUM/acre): 1.32

Kentucky Bluegrass/Rush/Forbs (3.2)
Average Annual Production (lbs./acre, air-dry):
3000
Stocking Rate* (AUM/acre): 0.82

Annual/Pioneer, Non-Native Perennial (3.3)
Average Annual Production (lbs./acre, air-dry):
1600
Stocking Rate* (AUM/acre): 0.44

*Based on 912 lbs./acre (air-dry weight) per Animal Unit Month (AUM), and on 25 percent harvest efficiency (refer to United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS), National Range and Pasture Handbook).

Grazing by domestic livestock is one of the major income-producing industries in the area. Rangeland in this area may provide yearlong forage. During the dormant period, the forage for livestock will likely be lacking protein to meet livestock requirements, and added protein will allow ruminants to better utilize the energy stored in grazed plant materials. A forage quality test (either directly or through fecal sampling) should be used to determine the level of supplementation needed.

Hydrological functions

Water is the principal factor limiting forage production on this site. This site is dominated by soils in hydrologic groups B, C and D. Infiltration is typically moderate to moderately slow and runoff potential for this site varies from negligible to low depending on soil hydrologic group, slope, and ground cover. In many cases, areas with greater than 75 percent ground cover have the greatest potential for high infiltration and lower runoff. Areas where ground cover is less than 50 percent have the greatest potential to have reduced infiltration and higher runoff (refer to Section 4, NRCS National Engineering Handbook for runoff quantities and hydrologic curves).

Recreational uses

This site provides hunting, hiking, photography, bird watching, and other opportunities. The wide varieties of plants that bloom from spring until fall have an esthetic value that appeals to visitors.

Wood products

No appreciable wood products are typically present on this site.

Other products

Seed harvest of native plant species can provide additional income on this site.

Supporting information

Inventory data references

Information presented here has been derived from NRCS clipping data and other inventory data. Field observations from range-trained personnel were also used. Those involved in developing this site include: Stan Boltz, Range Management Specialist, NRCS; and Bruce Kunze, Soil Scientist, NRCS.

Data Source Sample Period State County
SCS-RANGE-417 (0018546011) 1985 SD Brookings
SCS-RANGE-417 (5018546025) 1985 SD Clark

Other references

Cleland, D.T., J.A. Freeouf, J.E. Keys, G.J. Nowacki, C. Carpenter, and W.H. McNab. 2007. Ecological Subregions: Sections and Subsections of the Coterminous United States. USDA Forest Service, General Technical Report WO-76. Washington, DC. 92 pps.

Gilbert, M. C., Whited, P. M., Clairain Jr, E. J., & Smith, R. D. (2006). A Regional Guidebook for Applying the Hydrogeomorphic Approach to Assessing Wetland Functions of Prairie Potholes. Washington DC.

Samson, F. B., & Knopf, F. L. (1996). Prairie Conservation Preserving North America's Most Endagered Ecosystem. Washington D.C.: Island Press.

Soil Survey Staff, Natural Resources Conservation Service, United States Department of Agriculture. Official Soil Series Descriptions. Available online. Accessed March 2018.

United States Department of Agriculture – Natural Resource Conservation Service (USDA-NRCS). 2003. National Range and Pasture Handbook, Revision 1. Grazing Lands Technology Institute. 214 pps.

United States Department of Agriculture – Natural Resource Conservation Service (USDA-NRCS). 2006. Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook 296. 672pps.

USDA, NRCS. National Soil Information System, Information Technology Center, 2150 Centre Avenue, Building A, Fort Collins, CO 80526. (http://soils.usda.gov/technical/nasis/)

USDA, NRCS. 2018. The PLANTS Database (http://plants.usda.gov, 27 March 2018). National Plant Data Team, Greensboro, NC 27401-4901 USA.

U.S. Environmental Protection Agency [EPA]. 2013. Level III and Level IV Ecoregions of the Continental United States. Corvallis, OR, U.S. EPA, National Health and Environmental Effects Research Laboratory, map scale 1:3,000,000. Available at http://www.epa.gov/eco-research/level-iii-and-iv-ecoregions- continental-united-states. (Accessed 1 March 2018).

Contributors

Megan Baxter
Stan Boltz
Lance Howe
Steven Winter

Approval

Suzanne Mayne-Kinney, 6/27/2024

Acknowledgments

Contact for Lead Authors: Natural Resources Conservation Service (USDA-NRCS), Redfield Soil Survey Office Redfield, SD; Lance Howe (Lance.Howe@usda.gov), Soil Survey Office Leader, USDA-NRCS, Redfield, SD; and Steve Winter (Steven.Winter@usda.gov), Soil Scientist, USDA-NRCS, Redfield, SD

Additional Information Acknowledgment: Jason Hermann (Jason.Hermann@usda.gov), Area Rangeland Management Specialist, USDA-NRCS, Redfield, SD.

Rangeland health reference sheet

Interpreting Indicators of Rangeland Health is a qualitative assessment protocol used to determine ecosystem condition based on benchmark characteristics described in the Reference Sheet. A suite of 17 (or more) indicators are typically considered in an assessment. The ecological site(s) representative of an assessment location must be known prior to applying the protocol and must be verified based on soils and climate. Current plant community cannot be used to identify the ecological site.

Author(s)/participant(s)	David Schmidt, Tim Nordquist, Stan Boltz
Contact for lead author
Date	12/04/2007
Approved by	Suzanne Mayne-Kinney
Approval date
Composition (Indicators 10 and 12) based on	Annual Production

Indicators

Number and extent of rills:
Rills should not be present.
Presence of water flow patterns:
Barely observable.
Number and height of erosional pedestals or terracettes:
Essentially, non-existent.
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Bare ground less than 5% and less than 2 inches in diameter.
Number of gullies and erosion associated with gullies:
Active gullies should not be present.
Extent of wind scoured, blowouts and/or depositional areas:
None.
Amount of litter movement (describe size and distance expected to travel):
Little to no plant litter movement. Plant litter remains in place and is not moved by erosional forces.
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Stability class usually 6. Typically high root content, organic matter, and granular structure. Soil surface is very resistant to erosion.
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Use soil series description for depth and color of A-horizon.
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Healthy, deep rooted native grasses enhance infiltration and reduce runoff.
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
No compaction layer should be evident.
Functional/Structural Groups (list in order of descending dominance by above-ground annual-production or live foliar cover using symbols: >>, >, = to indicate much greater than, greater than, and equal to):

Dominant:
Tall warm-season rhizomatous grass >> mid warm-season bunch grass

Sub-dominant:
> tall cool-season bunch grass > short cool-season grass > forb

Other:

Additional:
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Very little to no evidence of decadence or mortality.
Average percent litter cover (%) and depth ( in):
85-90%, roughly 0.5 inch thick or less. Litter cover is in contact with soil surface.
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
4800 – 6000 lbs./acre air-dry weight, average 5,400 lbs./acre air-dry weight
Potential invasive (including noxious) species (native and non-native). List species which BOTH characterize degraded states and have the potential to become a dominant or co-dominant species on the ecological site if their future establishment and growth is not actively controlled by management interventions. Species that become dominant for only one to several years (e.g., short-term response to drought or wildfire) are not invasive plants. Note that unlike other indicators, we are describing what is NOT expected in the reference state for the ecological site:
Refer to State and Local Noxious Weed List, also Kentucky bluegrass, smooth bromegrass
Perennial plant reproductive capability:
All species are capable of reproducing.

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Ecosystem states

1. Reference State

2. Native/Invaded State

3. Invaded State

4. Crop Production State

T1A	-	non-use and/or no surface fire and/or heavy continuous grazing or invasion
T1B	-	Tillage
T2A	-	Non-use and/or no surface fire, or heavy continuous grazing
T2C	-	Tillage
R3A	-	Long-term prescribed grazing, prescribed burning, seeding
T3	-	Tillage
R4A	-	Seeding
R4B	-	Seeding, Cropping followed by abandonment