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Ecological site R102AY036SD

Saline Subirrigated

Accessed: 04/25/2024

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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

For further information on this Ecological Site Description (ESD), view on South Dakota Electronic Field Office Technical Guide (EFOTG), contact the NRCS State Office in Huron, SD, or MLRA Soil Survey Office in Redfield, SD.

Classification relationships

Level IV Ecoregions of the Conterminous United States: 46e – Tewaukon Dead Ice Moraine, 46k – Prairie Coteau, 46l – Prairie Coteau Escarpment, 46m – Big Sioux Basin, 46o – Minnesota River Prairie, 47b – Des Moines Lobe, 48d – Lake Agassiz Plain, 51j – Alexandria Moraines and Detroit Lakes Outwash Plain.

Associated sites

R102AY002SD	Linear Meadow
R102AY004SD	Wet Meadow
R102AY007SD	Saline Lowland
R102AY010SD	Loamy
R102AY011SD	Clayey

Similar sites

R102AY006SD	Limy Subirrigated (R102AY006SD) – Limy Subirrigated [less switchgrass & prairie cordgrass, more needlegrasses]

R102AY006SD

Limy Subirrigated

(R102AY006SD) – Limy Subirrigated [less switchgrass & prairie cordgrass, more needlegrasses]

Table 1. Dominant plant species

Tree	Not specified
Shrub	Not specified
Herbaceous	(1) Andropogon gerardii (2) Schizachyrium scoparium

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Physiographic features

This site occurs on nearly level flood plains or swales.

Table 2. Representative physiographic features

Landforms	(1) Swale (2) Flood plain
Flooding duration	Brief (2 to 7 days)
Flooding frequency	None to frequent
Elevation	1,000 – 2,000 ft
Slope	1 – 2%
Water table depth	12 – 60 in
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 (average)	159 days
Freeze-free period (average)	136 days
Precipitation total (average)	24 in

Bar

Line

Figure 2. Monthly precipitation range

Bar

Line

Figure 3. Monthly average minimum and maximum temperature

Figure 4. Annual precipitation pattern

Figure 5. Annual average temperature pattern

Soil features

The soils in this site are poorly to somewhat poorly drained and formed in alluvium and loamy till. The loam to silty clay loam surface layer is 4 to 11 inches thick and typically has a granular structure. Dark colors are very deep in these soils. The soils have a slow to moderately slow infiltration rate. This site should show no evidence of rills, wind scoured areas, or pedestalled plants. If present, water flow paths are broken, irregular in appearance, or discontinuous. The soil surface is stable and intact. These soils are mainly susceptible to water erosion. The hazard of water erosion increases where vegetative cover is not adequate. A drastic loss of the soil surface layer on this site can result in a shift in species composition and/or production.

Access Web Soil Survey (http://websoilsurvey.nrcs.usda.gov/app/HomePage.htm) for specific local soils information.

Table 4. Representative soil features

Surface texture	(1) Loam (2) Silty clay loam
Drainage class	Poorly drained to somewhat poorly drained
Permeability class	Slow to moderately slow
Soil depth	80 in
Surface fragment cover <=3"	2%
Surface fragment cover >3"	Not specified
Available water capacity (0-40in)	6 – 7 in
Calcium carbonate equivalent (0-40in)	5 – 35%
Electrical conductivity (0-40in)	4 – 16 mmhos/cm
Sodium adsorption ratio (0-40in)	2 – 10
Soil reaction (1:1 water) (0-40in)	7.4 – 9
Subsurface fragment volume <=3" (Depth not specified)	5%
Subsurface fragment volume >3" (Depth not specified)	Not specified

Ecological dynamics

This site developed under Northern Great Plains climatic conditions, light to severe grazing by bison and other large herbivores, sporadic natural or man-caused wildfire (often of light intensities), and other biotic and abiotic factors that typically influence soil/site development. Changes will occur in the plant communities due to short-term weather variations, impacts of native and/or exotic plant and animal species, and management actions. While the following plant community descriptions describe more typical transitions that will occur, severe disturbances, such as periods of well below average precipitation, can cause significant shifts in plant communities and/or species composition that may not be described within this document.

Heavy continuous grazing without adequate recovery periods following each grazing occurrence over several years causes this site to depart from the interpretive plant community. Species such as little bluestem and sedge will initially increase. Big bluestem, Indiangrass, and switchgrass will decrease in frequency and production. Heavy, continuous grazing causes inland saltgrass to increase 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 species such as spikerush, sedge, foxtail barley, and prairie cordgrass. Grazing, especially if adequate recovery periods are not allowed may be more detrimental on this site than haying. Biotic integrity on this site may be maintained more readily through periodic haying than through grazing.

Interpretations are primarily based on the 1.1 Bluestem/Indiangrass/Switchgrass Plant Community Phase. It has 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 used. Plant community phases, states, transitional pathways, and thresholds have been determined through similar studies and experience.

The following is a diagram that illustrates the common plant community phases that can occur on the site and the transition pathways between communities. These are the most common plant community phases based on current knowledge and experience, and changes may be made as more data is collected. Narratives following the diagram contain more detail pertaining to the ecological processes.

State and transition model

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Standard diagram

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Click on state and transition labels to scroll to the respective text

State 1
Reference

This state represents the natural range of variability that dominates the dynamics of this ecological site (ES). This state is dominated by warm-season grasses. In pre-European times, the primary disturbance mechanisms for this site in the reference condition included periods of below and/or above average precipitation, periodic fire, and herbivory by insects and large ungulates. Timing of fires and herbivory coupled with weather events dictated the dynamics that occurred within the natural range of variability. In some locations, this site likely received relatively heavy grazing pressure. Tall warm-season grasses would have declined, and shorter-statured grass and grass-likes would have increased. Today, this state 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.

Community 1.1
Bluestem/Indiangrass/Switchgrass Plant Community Phase

Interpretations are based primarily on the Bluestem/Indiangrass/Switchgrass Plant Community Phase (this is also considered to be climax). The potential vegetation is about 85 percent grasses or grass-like plants and 15 percent forbs. The community is dominated by warm-season grasses. The major grasses include big bluestem, little bluestem, Indiangrass, and switchgrass. Other grass or grass-like species include prairie cordgrass, slender wheatgrass, western wheatgrass, sideoats grama, alkali sacaton, plains bluegrass, and sedge. 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 6. Annual production by plant type (representative values) or group (midpoint values)

Table 5. Annual production by plant type

Plant type	Low (lb/acre)	Representative value (lb/acre)	High (lb/acre)
Grass/Grasslike	3210	3960	4410
Forb	190	440	790
Total	3400	4400	5200

Figure 7. Plant community growth curve (percent production by month). SD0210, Rolling Till Prairie, lowland warm-season dominant.. Warm-season dominant, lowland..

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	8	15	21	26	15	8	5	0	0

Community 1.2
Little Bluestem/Wheatgrass/Foxtail Barley/Inland Saltgrass Plant Community Phase

This plant community evolves under heavy continuous grazing or from over utilization during extended drought periods. The potential plant community is made up of approximately 90 percent grasses and grass-like species and 10 percent forbs. Dominant grass and grass-like species include little bluestem, western wheatgrass, slender wheatgrass, inland saltgrass, and foxtail barley. Grass and grass-like species of secondary importance include big bluestem, sedge, spikerush, plains bluegrass, prairie cordgrass, and switchgrass. Forbs commonly found in this plant community include Pursh seepweed, goldenrod, cudweed sagewort, silverleaf cinquefoil, alkali plantain, western ragweed, and annual marshelder. When compared to the Bluestem/Indiangrass/Switchgrass Plant Community Phase (1.1), slender wheatgrass, western wheatgrass, foxtail barley, inland saltgrass, sedge, and grass-like species increase. Production of tall warm-season grasses is 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 will be functioning at optimum levels. However, the vigor and reproductive capability of the tall warm-season grasses will be 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.

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

Table 6. Annual production by plant type

Plant type	Low (lb/acre)	Representative value (lb/acre)	High (lb/acre)
Grass/Grasslike	2540	3330	3980
Forb	160	270	420
Total	2700	3600	4400

Figure 9. Plant community growth curve (percent production by month). SD0208, Rolling Till Prairie, lowland cool-season/warm-season codominant.. Cool-season, warm-season codominant, lowland..

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	11	19	23	20	12	6	5	0	0

Pathway 1.1a
Community 1.1 to 1.2

Heavy continuous grazing which includes herbivory at moderate to heavy levels at the same time of year each year without adequate recovery periods, or a combination of disturbances such as extended periods of below average precipitation coupled with periodic or chronic heavy grazing will shift this community to the 1.2 Little Bluestem/Wheatgrass/Foxtail Barley/Inland Saltgrass Plant Community Phase.

Pathway 1.2a
Community 1.2 to 1.1

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 1.1 Bluestem/Indiangrass/Switchgrass Plant Community Phase.

Conservation practices

Prescribed Grazing

State 2
Degraded

This State is characterized by the dominance of the shorter-statured, more saline tolerant species such as foxtail barley and inland saltgrass, the increase in bare ground, and the increased presence of salt accumulations on the soil surface. Infiltration is reduced, which allows the moisture and the salts carried by the moisture to be wicked up to the soil surface. The short-statured and shallow rooted species are more capable of withstanding the higher concentrations of salts in the soil surface. As the disturbance level increases, plant density decreases even more, giving way to annual species and invasive perennial species, as well as, a further increase in bare ground.

Community 2.1
Foxtail Barley/Inland Saltgrass, Bare Ground Plant Community Phase

This plant community developed with heavy continuous season-long grazing where adequate recovery periods between grazing events were not allowed. Patches of inland saltgrass sod are typical and foxtail barley is well distributed throughout the community. Tall warm-season grasses are nearly absent, and little bluestem, slender wheatgrass, and western wheatgrass have been greatly reduced and may persist in remnant amounts, reduced in vigor. Bare ground may develop in micro lows where salt concentrations are highest. A white salt crust may form on the soil surface. The forb component is comprised of salt tolerant species such as Pursh seepweed and silverleaf cinquefoil. This plant community is resistant to change due to the grazing tolerance of inland saltgrass and increased surface salts. A significant amount of production and diversity has been lost when compared to community phase 1.1. Loss of key warm-season grasses and increased bare ground has negatively impacted energy flow and nutrient cycling. Water infiltration is reduced significantly due to the shallow rooting depth of inland saltgrass and increased bare ground.

Figure 10. Annual production by plant type (representative values) or group (midpoint values)

Table 7. Annual production by plant type

Plant type	Low (lb/acre)	Representative value (lb/acre)	High (lb/acre)
Grass/Grasslike	1365	1880	2375
Forb	35	120	225
Total	1400	2000	2600

Figure 11. Plant community growth curve (percent production by month). SD0208, Rolling Till Prairie, lowland cool-season/warm-season codominant.. Cool-season, warm-season codominant, lowland..

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	11	19	23	20	12	6	5	0	0

Community 2.2
Annual/Pioneer, Non-Native Perennial, Bare Ground Plant Community Phase

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 and 20 to 60 percent forbs. 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 2.1a
Community 2.1 to 2.2

Heavy continuous grazing (stocking rates well above capacity for extended portions of the growing season without adequate recovery) or heavy seasonal grazing (stocking rates well above capacity for a portion of the growing season but at the same time of year every year and without adequate recovery) will shift the plant community phase to the 2.2 Annual/Pioneer, Non-Native Perennial, Bare Ground Plant Community Phase.

Pathway 2.2a
Community 2.2 to 2.1

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 2.1 Foxtail Barley/Inland Saltgrass, Bare Ground Plant Community Phase.

Transition T1
State 1 to 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 a combination of disturbances such as extended periods of below average precipitation coupled with periodic or chronic heavy grazing will shift this community to the 2.1 Foxtail Barley/Inland Saltgrass, Bare Ground Plant Community Phase within the Degraded State (State 2).

Transition T3
State 1 to 2

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 Degraded State (State 2) and more specifically to the 2.2 Annual/Pioneer, Non-native Perennial, Bare Ground 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 T3
State 1 to 2

Restoration pathway R2
State 2 to 1

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 plant community phase over a threshold to the Reference State (State 1). Wetland restoration techniques may be necessary to restore biotic integrity and plant diversity and productivity.

Conservation practices

Prescribed Grazing

Additional community tables

Table 8. Community 1.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production (lb/acre)	Foliar cover (%)
Grass/Grasslike
1	Tall Warm-season Grasses			1100–2420
	big bluestem	ANGE	Andropogon gerardii	440–1320	–
	switchgrass	PAVI2	Panicum virgatum	220–660	–
	Indiangrass	SONU2	Sorghastrum nutans	220–660	–
	prairie cordgrass	SPPE	Spartina pectinata	44–440	–
2	Mid Warm-season Grasses			660–1320
	little bluestem	SCSC	Schizachyrium scoparium	660–1320	–
	alkali sacaton	SPAI	Sporobolus airoides	0–220	–
	sideoats grama	BOCU	Bouteloua curtipendula	0–220	–
3	Cool-season Grasses			220–440
	slender wheatgrass	ELTR7	Elymus trachycaulus	44–440	–
	western wheatgrass	PASM	Pascopyrum smithii	44–440	–
	plains bluegrass	POAR3	Poa arida	44–220	–
	foxtail barley	HOJU	Hordeum jubatum	0–44	–
4	Short Warm-season Grasses			44–88
	saltgrass	DISP	Distichlis spicata	44–88	–
	mat muhly	MURI	Muhlenbergia richardsonis	0–44	–
5	Other Native Grasses			44–220
	Graminoid (grass or grass-like)	2GRAM	Graminoid (grass or grass-like)	0–220	–
	prairie Junegrass	KOMA	Koeleria macrantha	44–132	–
	Scribner's rosette grass	DIOLS	Dichanthelium oligosanthes var. scribnerianum	0–44	–
6	Grass-likes			88–352
	sedge	CAREX	Carex	44–352	–
	spikerush	ELEOC	Eleocharis	0–132	–
	Grass-like (not a true grass)	2GL	Grass-like (not a true grass)	0–88	–
Forb
7	Forbs			220–660
	Forb, native	2FN	Forb, native	44–220	–
	white sagebrush	ARLU	Artemisia ludoviciana	44–132	–
	Maximilian sunflower	HEMA2	Helianthus maximiliani	44–132	–
	goldenrod	SOLID	Solidago	44–132	–
	white heath aster	SYER	Symphyotrichum ericoides	44–88	–
	silver cinquefoil	POAR8	Potentilla argentea	44–88	–
	upright prairie coneflower	RACO3	Ratibida columnifera	44–88	–
	Indianhemp	APCA	Apocynum cannabinum	44–88	–
	American licorice	GLLE3	Glycyrrhiza lepidota	44–88	–
	tall blazing star	LIAS	Liatris aspera	44–88	–
	western marbleseed	ONBEO	Onosmodium bejariense var. occidentale	44–88	–
	Flodman's thistle	CIFL	Cirsium flodmanii	44–88	–
	western yarrow	ACMIO	Achillea millefolium var. occidentalis	44–88	–
	Cuman ragweed	AMPS	Ambrosia psilostachya	44–88	–
	Canadian anemone	ANCA8	Anemone canadensis	0–44	–
	smooth horsetail	EQLA	Equisetum laevigatum	0–44	–
	bluebell bellflower	CARO2	Campanula rotundifolia	0–44	–
	redwool plantain	PLER	Plantago eriopoda	0–44	–
	palespike lobelia	LOSP	Lobelia spicata	0–44	–
	rough bugleweed	LYAS	Lycopus asper	0–44	–
	annual marsh elder	IVAN2	Iva annua	0–44	–
	western dock	RUAQ	Rumex aquaticus	0–44	–
	Norwegian cinquefoil	PONO3	Potentilla norvegica	0–44	–
	prairie violet	VIPE2	Viola pedatifida	0–44	–
	meadow zizia	ZIAP	Zizia aptera	0–44	–
	Pursh seepweed	SUCA2	Suaeda calceoliformis	0–44	–

Table 9. Community 1.2 plant community composition

Group	Common name	Symbol	Scientific name	Annual production (lb/acre)	Foliar cover (%)
Grass/Grasslike
1	Tall Warm-season Grasses			72–540
	big bluestem	ANGE	Andropogon gerardii	36–360	–
	prairie cordgrass	SPPE	Spartina pectinata	0–252	–
	switchgrass	PAVI2	Panicum virgatum	0–180	–
	Indiangrass	SONU2	Sorghastrum nutans	0–108	–
2	Mid Warm-season Grasses			180–1260
	little bluestem	SCSC	Schizachyrium scoparium	180–1260	–
	alkali sacaton	SPAI	Sporobolus airoides	0–108	–
3	Cool-season Grasses			360–1080
	western wheatgrass	PASM	Pascopyrum smithii	180–720	–
	slender wheatgrass	ELTR7	Elymus trachycaulus	72–540	–
	foxtail barley	HOJU	Hordeum jubatum	36–360	–
	plains bluegrass	POAR3	Poa arida	0–144	–
4	Short Warm-season Grasses			180–540
	saltgrass	DISP	Distichlis spicata	180–540	–
	mat muhly	MURI	Muhlenbergia richardsonis	0–108	–
5	Other Native Grasses			0–180
	Graminoid (grass or grass-like)	2GRAM	Graminoid (grass or grass-like)	0–144	–
	prairie Junegrass	KOMA	Koeleria macrantha	0–36	–
6	Grass-likes			180–720
	sedge	CAREX	Carex	108–540	–
	spikerush	ELEOC	Eleocharis	36–360	–
	Grass-like (not a true grass)	2GL	Grass-like (not a true grass)	0–108	–
Forb
7	Forbs			40–200
	Pursh seepweed	SUCA2	Suaeda calceoliformis	36–108	–
	Forb, native	2FN	Forb, native	36–108	–
	western yarrow	ACMIO	Achillea millefolium var. occidentalis	0–108	–
	Cuman ragweed	AMPS	Ambrosia psilostachya	36–72	–
	white sagebrush	ARLU	Artemisia ludoviciana	0–72	–
	redwool plantain	PLER	Plantago eriopoda	0–72	–
	silver cinquefoil	POAR8	Potentilla argentea	36–72	–
	annual marsh elder	IVAN2	Iva annua	0–72	–
	Forb, introduced	2FI	Forb, introduced	0–72	–
	goldenrod	SOLID	Solidago	0–72	–
	tall blazing star	LIAS	Liatris aspera	0–36	–
	western marbleseed	ONBEO	Onosmodium bejariense var. occidentale	0–36	–
	Norwegian cinquefoil	PONO3	Potentilla norvegica	0–36	–
	upright prairie coneflower	RACO3	Ratibida columnifera	0–36	–
	western dock	RUAQ	Rumex aquaticus	0–36	–
	Flodman's thistle	CIFL	Cirsium flodmanii	0–36	–
	smooth horsetail	EQLA	Equisetum laevigatum	0–36	–
	American licorice	GLLE3	Glycyrrhiza lepidota	0–36	–
	Maximilian sunflower	HEMA2	Helianthus maximiliani	0–36	–
	Indianhemp	APCA	Apocynum cannabinum	0–36	–
	white heath aster	SYER	Symphyotrichum ericoides	0–36	–

Table 10. Community 2.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production (lb/acre)	Foliar cover (%)
Grass/Grasslike
1	Tall Warm-season Grasses			0–100
	prairie cordgrass	SPPE	Spartina pectinata	0–100	–
2	Mid Warm-season Grasses			0–100
	little bluestem	SCSC	Schizachyrium scoparium	0–100	–
	alkali sacaton	SPAI	Sporobolus airoides	0–40	–
3	Cool-season Grasses			200–700
	foxtail barley	HOJU	Hordeum jubatum	200–700	–
	western wheatgrass	PASM	Pascopyrum smithii	0–160	–
	slender wheatgrass	ELTR7	Elymus trachycaulus	0–100	–
	plains bluegrass	POAR3	Poa arida	0–60	–
4	Short Warm-season Grasses			600–1100
	saltgrass	DISP	Distichlis spicata	500–1000	–
	mat muhly	MURI	Muhlenbergia richardsonis	20–160	–
5	Other Native Grasses			0–40
	Graminoid (grass or grass-like)	2GRAM	Graminoid (grass or grass-like)	0–40	–
6	Grass-likes			20–160
	spikerush	ELEOC	Eleocharis	20–140	–
	sedge	CAREX	Carex	0–100	–
	Grass-like (not a true grass)	2GL	Grass-like (not a true grass)	0–40	–
Forb
7	Forbs			40–200
	Pursh seepweed	SUCA2	Suaeda calceoliformis	20–100	–
	Forb, introduced	2FI	Forb, introduced	0–60	–
	Forb, native	2FN	Forb, native	20–60	–
	annual marsh elder	IVAN2	Iva annua	0–60	–
	redwool plantain	PLER	Plantago eriopoda	20–60	–
	silver cinquefoil	POAR8	Potentilla argentea	20–60	–
	Norwegian cinquefoil	PONO3	Potentilla norvegica	0–20	–
	goldenrod	SOLID	Solidago	0–20	–
	western yarrow	ACMIO	Achillea millefolium var. occidentalis	0–20	–
	Cuman ragweed	AMPS	Ambrosia psilostachya	0–20	–
	Flodman's thistle	CIFL	Cirsium flodmanii	0–20	–
	smooth horsetail	EQLA	Equisetum laevigatum	0–20	–

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.

Bluestem/Indiangrass/Switchgrass (1.1)
Average Annual Production (lbs./acre, air-dry): 4400
Stocking Rate* (AUM/acre): 1.21

Little Bluestem/Wheatgrass/Foxtail Barley/Inland Saltgrass (1.2)
Average Annual Production (lbs./acre, air-dry): 3600
Stocking Rate* (AUM/acre): 0.99

Foxtail Barley/Inland Saltgrass, Bare Ground (2.1)
Average Annual Production (lbs./acre, air-dry): 2000
Stocking Rate* (AUM/acre): 0.55

Annual/Pioneer, Non-Native Perennial, Bare Ground (2.2)
Average Annual Production (lbs./acre, air-dry): 1200
Stocking Rate* (AUM/acre): 0.33

*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 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. An example of an exception would be where shortgrasses form a strong sod and dominate the site. Dominance by Kentucky bluegrass and/or smooth bromegrass will result in reduced infiltration and increased 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.

Other references

High Plains Regional Climate Center, University of Nebraska, 830728 Chase Hall, Lincoln, NE 68583-0728. (http://www.hprcc.unl.edu/)
USDA, NRCS. National Water and Climate Center, 101 SW Main, Suite 1600, Portland, OR 97204-3224. (http://www.wcc.nrcs.usda.gov)
USDA, NRCS. National Range and Pasture Handbook, September 1997
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. 2001. The PLANTS Database, Version 3.1 (http://plants.usda.gov). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

Contributors

Megan Baxter
Stan Boltz

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	Stan Boltz
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:
Mid warm-season bunch grass >> tall warm-season rhizomatous grass

Sub-dominant:
> mid cool-season rhizomatous grass > short warm-season rhizomatous 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):
3800 – 5000 lbs./acre air-dry weight, average 4,400 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
Perennial plant reproductive capability:
All species are capable of reproducing.

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