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Ecological site R077EY055TX

Hardland Slopes 16-24" PZ

Last updated: 9/12/2023
Accessed: 11/13/2024

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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): 077E–Southern High Plains, Breaks

MLRA 77E occurs along moderately sloping breaks and steep escarpments associated with dissecting river systems and erosional margins of the Southern High Plains. Soil temperature regime is thermic and soil moisture regime is ustic bordering on aridic. Loamy and sandy soils are generally well drained, range from shallow to deep, and developed in Ogallala Formation sediments.

Classification relationships

This ecological site is correlated to soil components at the Major Land Resource Area (MLRA) level which is further described in USDA Ag Handbook 296.

Ecological site concept

Hardland Slopes ecological site is a narrow transitional site usually found above draws and below escarpments of rough breaks with steep slopes. Reference vegetation is a shortgrass plant community with some midgrasses, forbs, and few woody species. Runoff is high due to steep slopes. Abusive grazing and/or removal of fire may impact the plant community composition and productivity.

Associated sites

R077EY051TX	Clay Loam 16-24" PZ Nearly level to gently sloping plains, divides, side slopes and upland terraces with very deep clay loam soils. Short grasses and midgrasses with scattered forbs and few shrubs.
R077EY052TX	Draw 16-24" PZ Nearly level to very gently sloping very deep loamy soils on lower draw landscapes. Tall and midgrass species with forbs and few woody plants
R077EY061TX	Mixedland Slopes 16-24" PZ Very gently to moderately steeply sloping, very deep coarse-loamy soils on lower hillslopes. Tallgrasses and midgrasses dominate with forbs, and few shrub species.
R077EY053TX	Gravelly 16-24" PZ Gently sloping to steep hillslopes, very deep gravelly loams and gravelly sandy loam soils on lower positions. Up to 35% of the soil surface covered with gravels. Intermixed midgrasses and shortgrasses and forbs with occasional tallgrasses.
R077EY057TX	Limy Upland 16-24" PZ Gently sloping to moderately sloping loamy soils with highly calcareous subsoils on similar positions. Short and mid-grass dominate and with few tall grasses, perennial and annual forbs, and few woody species present.
R077EY062TX	Breaks 16-24" PZ Strongly sloping to very steep, shallow, loamy soils often intermixed with rock outcrops on higher positions. A mixture of grasses, forbs, shrubs, and a few trees with bare ground. Many rocks and cobbles on the surface.

Similar sites

R077EY057TX	Limy Upland 16-24" PZ Limy Upland is more calcareous thoughout the soil profile and occupy a different position on the landscape. Limy Upland supports more sideoats grama and other midgrasses whereas Hardland slopes are dominantly blue grama.

R077EY057TX

Limy Upland 16-24" PZ

Limy Upland is more calcareous thoughout the soil profile and occupy a different position on the landscape. Limy Upland supports more sideoats grama and other midgrasses whereas Hardland slopes are dominantly blue grama.

Table 1. Dominant plant species

Tree	Not specified
Shrub	Not specified
Herbaceous	(1) Bouteloua gracilis (2) Bouteloua dactyloides

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Physiographic features

This site is classified as an upland. Slope gradients are most commonly 3 to 8% but they can range from 0 to 20%. This site is found along nearly level to moderately steep side slopes along draws and benches below escarpments.

Table 2. Representative physiographic features

Landforms	(1) Plains > Hillslope (2) Plains > Valley side (3) Plains > Alluvial fan
Runoff class	Negligible to high
Flooding frequency	None
Ponding frequency	None
Elevation	2,000 – 4,500 ft
Slope	20%
Aspect	Aspect is not a significant factor

Table 3. Representative physiographic features (actual ranges)

Runoff class	Negligible to high
Flooding frequency	None
Ponding frequency	None
Elevation	2,000 – 4,500 ft
Slope	45%

Climatic features

Climate is a cold semi-arid steppe (Koppen-Geiger classification BSk). Summers are hot and winters are cold. Temperature extremes are common. Humidity is generally low, evaporation is high, and short-term droughts are common. Average annual wind speed is 12 mph with highest winds in early spring. The prevailing wind direction is south. Summertime brings strong high pressure systems that build into heat domes with highs in the upper 90 to mid-100 degree F range. Evaporation in summer is high and open pan evaporation exceeds 6 feet per year. Early autumn temperatures are mild, with Canadian and Pacific cold fronts bringing cold air in mid-autumn throughout winter. Arctic air can settle in and dominate for several weeks during winter with very cold air in place for 2 to 3 weeks at a time.

Most of the precipitation comes in the form of rain from May through September. Rainfall events often occur as intense showers of relatively short duration. Snowfall average is about 17 inches but is also variable from 8 to 36 inches annually. Long term droughts are likely to occur every 15 to 20 years and may last 4 to 5 years. Mean precipitation is around 21 inches but varies significantly from year to year. Rainfall amounts over the last 100 years have varied from as little as 9 inches to as much as 37 inches. The probability is about 70% that precipitation will fall between 14 to 24 inches. Growing season averages 190 days. Average first frost is around October 22, and the last freeze of the season occurs around April 15.

Table 4. Representative climatic features

Frost-free period (characteristic range)	146-164 days
Freeze-free period (characteristic range)	184-194 days
Precipitation total (characteristic range)	20-24 in
Frost-free period (actual range)	144-176 days
Freeze-free period (actual range)	180-198 days
Precipitation total (actual range)	19-26 in
Frost-free period (average)	156 days
Freeze-free period (average)	189 days
Precipitation total (average)	22 in

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) GATE [USC00343489], Gate, OK
(2) BOYS RANCH [USC00411000], Vega, TX
(3) BEAVER [USC00340593], Beaver, OK
(4) CANADIAN [USC00411412], Canadian, TX
(5) FOLLETT [USC00413225], Follett, TX
(6) SANFORD DAM [USC00418040], Fritch, TX
(7) GUYMON MUNI AP [USW00003030], Guymon, OK
(8) MEADE [USC00145171], Meade, KS
(9) CLARENDON [USW00023072], Clarendon, TX
(10) LIPSCOMB [USC00415247], Booker, TX
(11) CHANNING 2 [USC00411649], Channing, TX
(12) MIAMI [USC00415875], Miami, TX
(13) COLDWATER [USC00141704], Coldwater, KS
(14) REYDON 2SSE [USC00347579], Reydon, OK

Soil features

Soils are mapped for each county within the MLRA. Mapunits are representations of the major soil series component(s) and named accordingly. Each Mapunit is spatially represented on a digital soils map as polygons of different shapes and sizes. Within these Mapunits, there are often minor soil series components included. These minor components are soils that occur within a Mapunit polygon but are of small extent (15% or less of the Mapunit area). However, it is difficult to separate these minor soils spatially due to the scale of soil mapping.

Ecological sites are correlated at the component level of the soil survey. Therefore, a single Mapunit may contain multiple Ecological Sites just as it may contain multiple soil components. This is important to understand when investigating soils and Ecological Sites. A soil survey Mapunit may be correlated to a single Ecological Site based on the major component; however, there may be inclusions of areas of additional Ecological Sites which are correlated to the minor components of that particular soil Mapunit.

This site consists of deep to very deep, well drained, moderate permeability, moderately alkaline soils on nearly level to moderately steep terrain. It occurs on side slopes along draws and on benches and footslopes below the upper caprock escarpment. Slopes range from 0 to 20%, but are dominantly 3 to 8%. They commonly have light brown loam or clay loam surfaces and clay loam subsurface layers, and available water holding capacity is moderate. The fertility is moderate to high and when proper management is applied the root zone is easily penetrated by plant roots.

Representative soil components for this site include: Berda, Berthoud, and Paloduro.

Table 5. Representative soil features

Parent material	(1) Alluvium
Surface texture	(1) Loam (2) Clay loam (3) Fine sandy loam
Family particle size	(1) Fine-loamy
Drainage class	Well drained
Permeability class	Moderate
Soil depth	40 – 80 in
Surface fragment cover <=3"	5%
Surface fragment cover >3"	Not specified
Available water capacity (0-40in)	3.4 – 7.9 in
Calcium carbonate equivalent (0-40in)	1 – 14%
Sodium adsorption ratio (0-40in)	2
Soil reaction (1:1 water) (0-40in)	7.4 – 8.4
Subsurface fragment volume <=3" (0-40in)	10%
Subsurface fragment volume >3" (0-40in)	1%

Ecological dynamics

The information contained in the State and Transition Diagram (STD) and the Ecological Site Description was developed using archeological and historical data, professional experience, and scientific studies. The information presented is representative of a very complex set of plant communities. Not all scenarios or plants are included. Key indicator plants, animals and ecological processes are described to inform land management decisions.
Hardland Slopes ecological site is a narrow transitional site usually found along draws and below escarpments of rough breaks with steep slopes. Runoff is high due to percent slopes.

The reference plant community for this site is a shortgrass dominated community with a few midgrasses present in small depressional areas and moisture dependent forbs. Very few woody plants were present on this site although an occasional yucca (Yucca spp.) would be present. The dominant grass species is blue grama (Bouteloua gracilis) with a lesser amount of buffalograss (Bouteloua dactyloides). In low depressions that catch and hold a little moisture, western wheatgrass (Pascopyrum smithii) and vine mesquite (Panicum obtusum) may occur.

The major perennial forbs are scarlet globemallow (Sphaeralcea coccinea), scurfpea (Psoralidium teniuflorum), Engelmanndaisy (Engelmannia peristenia), dotted gayfeather (Liatris punctata), sagewort spp. (Artemesia spp.) and catclaw sensitivebriar (Mimosa aculeaticarpa var. biuncifera). Annual forbs are more abundant in years of above normal precipitation and consist of several different species. Forbs on this site normally make up 4 – 8 % of the total composition.

Natural fires played a major role in maintaining the plains grasslands. In general, woody plants were suppressed and grasses perpetuated. Although fire was significant in maintaining the shortgrass plains, it was probably more important to the maintenance of the tall and midgrass prairies. Fire in combination with a favorable growing season will generally tend to sustain the perennial shortgrass community. Fire in combination with drought can be a transitional pathway that can result in some plant community changes, at least for a period of several years. Research shows that blue grama that has not been grazed for several years can actually be damaged quite significantly by fire; especially if that fire happens to occur in the summer.

When this site is continually overgrazed by livestock, the vigor and production of vegetation decline. The sideoats grama (Bouteloua curtipendula), western wheatgrass and desirable forbs will decrease. Blue grama will take a sod bound appearance with continued close grazing and buffalograss will increase. The lower production and reduced cover will result in increased runoff and decreased infiltration. This site is subject to gully erosion when vegetative cover is poor. A good grass cover has a positive influence on infiltration and deep percolation of rainfall. The loss of soil organic matter has a negative impact on infiltration, and soil compaction. More rainfall is directed to overland flow, which causes increased soil erosion. Pedestaling, terracettes, and water flow patterns are range health indicators that will be present when this site begins to deteriorate.

This site can be invaded by pricklypear (Opuntia/Cylindropuntia spp.), broom snakeweed (Gutierrezia sarothrae) and yucca which can increase in density if poor management continues. Once in poor condition, this site can be difficult to restore to its original productive state.

The shortgrasses that dominate this site are so resistant to grazing that it is uncommon for them to actually be killed out, but they can be weakened dramatically. Rest and possibly controlling any invading competition will usually restore this site within a few years provided that grazing management is applied. This site is resilient provided abuse is not long term.

State and Transition Diagram:
A State and Transition Diagram for the Hardland Slopes (R077EY055TX) site is depicted below. Thorough descriptions of each state, transition, and pathway follow the model. Experts base this model on available experimental research, field observations, professional consensus, and interpretations. It is likely to change as knowledge increases.
Plant communities will differ across the MLRA because of the natural variability in weather, soils, and aspect. The Reference Plant Community is not necessarily the management goal; other vegetative states may be desired plant communities as long as the Range Health assessments are in the moderate and above category.

The biological processes on this site are complex. Therefore, representative values are presented in a land management context. The species lists are representative and are not botanical descriptions of all species occurring, or potentially occurring, on this site. They are not intended to cover every situation or the full range of conditions, species, and responses for the site.

Composition by dry weight and percent canopy cover are provided to describing the functional groups. Most observers find it easier to visualize or estimate percent canopy for woody species (trees and shrubs).

The following diagram suggests some pathways that the vegetation on this site might take. There may be other states not shown on the diagram. This information is intended to show what might happen in a given set of circumstances. It does not mean that this would happen the same way in every instance. Local professional guidance should always be sought before pursuing a treatment scenario.

State and transition model

More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective text

Ecosystem states

1. Shortgrass/Blue grama State

2. Shortgrass/Shrubland State

3. Degraded Shortgrass State

T1A	-	Absence of disturbance and natural regeneration over time, may be coupled with excessive grazing pressure
R2A	-	Reintroduction of historic disturbance regimes, may be coupled with rangeland seeding
T2A	-	Absence of disturbance and natural regeneration over time, may be coupled with excessive grazing pressure
R3B	-	Reintroduction of historic disturbance regimes, may require rangeland seeding and other management practices
R3A	-	Reintroduction of historic disturbance regimes, may require rangeland seeding and other management practices

State 1
Shortgrass/Blue grama State

This is the reference or diagnostic community for the site. The description is based on early range site descriptions, clipping data, professional consensus of experienced range specialists, and analysis of field work. The high vigor shortgrass community (1.1) is dominated by shortgrasses such as blue grama and buffalograss with a smaller midgrass component. This site is very productive if runoff can be minimized. Yucca, plains pricklypear and broom snakeweed are the principal woody species making up less than 5% of the total plant community. Relatively few forbs are present on this site. The average vigor shortgrass community (1.2) is dominated by shortgrasses such as sodbound blue grama with increasing amounts of buffalograss. There is a low annual production potential. The low vigor shortgrass community (1.3) is dominated by low production species such as blue grama and buffalograss. There is an invasion of other shortgrasses such as three-awn and silver bluestem. There is also an increase of annual forbs.

Dominant plant species

blue grama (Bouteloua gracilis), grass
buffalograss (Bouteloua dactyloides), grass

Community 1.1
High Vigor Shortgrass Community

Figure 8. 1.1 High Vigor Shortgrass Community

The plant community described here is the reference plant community present at the time of settlement. This is a transitional site dominated by shortgrasses with a smaller midgrass component. Blue grama is the dominant grass making up 50 - 60% of the total grass production. Buffalograss and sideoats grama are next in importance making up 10 – 20% of the composition. Other midgrasses include vine mesquite and western wheatgrass which occur in micro-depressions where moisture collects. This site is very productive if runoff can be minimized. Yucca, plains pricklypear and broom snakeweed are the principal woody species making up less than 5% of the total plant community. Relatively few forbs are present on this site. This plant community evolved through the absence of grazing by large herbivores and with fire frequency of every 10-20 years.

Figure 9. 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	720	1373	2025
Forb	40	78	115
Shrub/Vine	30	60	90
Tree	8	14	20
Microbiotic Crusts	0	0	0
Total	798	1525	2250

Figure 10. Plant community growth curve (percent production by month). TX1506, Shortgrass dominant. Warm season native perennial grasses with shortgrasses as being 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	2	3	8	25	30	12	4	8	4	3	1

Community 1.2
Average Vigor Shortgrass Community

The average vigor shortgrass community (1.2) is dominated by shortgrasses such as sodbound blue grama with increasing amounts of buffalograss. There is a low annual production potential.

Community 1.3
Low Vigor Shortgrass Community

The low vigor shortgrass community (1.3) is dominated by low production species such as blue grama and buffalograss. There is an invasion of other shortgrasses such as three-awn and silver bluestem. There is also an increase of annual forbs.

Pathway 1.1A
Community 1.1 to 1.3

Abusive grazing practices that include stocking above carrying capacity without adequate rest may push this community towards community 1.2 as the more palatable species are damaged.

Pathway 1.2A
Community 1.2 to 1.3

Abusive grazing practices that include stocking above carrying capacity without adequate rest may push this community towards community 1.2 as the more palatable species are damaged.

Pathway 1.3A
Community 1.3 to 1.1

Through adequate rest from grazing and favorable growing season precipitation, this community may be shifted back to community 1.1 under favorable rainfall.

Pathway 1.3B
Community 1.3 to 1.2

Through adequate rest from grazing and favorable growing season precipitation, this community may be shifted back to community phase 1.2.

State 2
Shortgrass/Shrubland State

This State is dominated by perennial three-awn and silver bluestem with low vigor blue grama and buffalograss. Numerous annuals also occur in this community stage. Production is lower than the historic climax community and diversity is less.

Dominant plant species

threeawn (Aristida), grass
silver bluestem (Bothriochloa saccharoides), grass

Community 2.1
Shortgrass with scattered shrubs Community

Figure 11. 2.1 Shortgrass with scattered shrub Community

This plant community is dominated by perennial three-awn and silver bluestem with low vigor blue grama and buffalograss. Numerous annuals also occurs in this community stage. Production is lower than the reference community and diversity is less. Higher percentage of bare ground.

Figure 12. 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	500	900	1300
Forb	50	85	120
Shrub/Vine	50	85	120
Tree	10	18	25
Microbiotic Crusts	0	0	0
Total	610	1088	1565

Figure 13. Plant community growth curve (percent production by month). TX1520, Shortgrass with scattered shrubs. Dominated by perennial threeawns and silver bluestem with low vigor blue grama and buffalograss..

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	1	4	6	12	29	18	8	15	5	1	1

State 3
Degraded Shortgrass State

Low vigor shortgrass, high percentage of bare ground, unstable site conditions. Yucca and other woody species have invaded the site. Gully erosion has occurred due to the lack of ground cover. The bare ground has poor vegetative cover.

Dominant plant species

yucca (Yucca), shrub

Community 3.1
Degraded Shortgrass Community

Figure 14. 3.1 Degraded Shortgrass Community

Figure 15. Annual production by plant type (representative values) or group (midpoint values)

Table 8. Annual production by plant type

Plant type	Low (lb/acre)	Representative value (lb/acre)	High (lb/acre)
Grass/Grasslike	400	800	1200
Shrub/Vine	60	95	130
Forb	50	85	120
Tree	15	23	30
Microbiotic Crusts	0	0	0
Total	525	1003	1480

Figure 16. Plant community growth curve (percent production by month). TX1521, Degraded Shortgrass, Increase Woody Species, Visible Erosion. Low vigor shortgrass, increase of woody species, and has bare ground..

Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
J	F	M	A	M	J	J	A	S	O	N	D
1	3	6	14	24	22	5	4	5	12	3	1

Transition T1A
State 1 to 2

With heavy continuous grazing, brush invasion, and no fires, the Shortgrass/Blue grama State will transition into the Shortgrass/Shrubland State.

Restoration pathway R2A
State 2 to 1

With the application of various conservation practices such as Prescribed Grazing, Prescribed Burning, Brush Management, and Pest Management, the Shortgrass/Shrubland State can be restored to the Shortgrass/Blue grama State.

Conservation practices

Brush Management
Prescribed Burning
Prescribed Grazing
Integrated Pest Management (IPM)

Transition T2A
State 2 to 3

With Heavy Continuous Grazing, Brush Invasion, and No Fires, the Shortgrass/Shrubland State will transition into the Degraded Shortgrass State.

Restoration pathway R3B
State 3 to 1

With Brush Management, Range Planting, Prescribed Grazing, and Pest Management conservation practices, the Degraded Shortgrass State can be restored to the Shortgrass/Blue grama State.

Conservation practices

Brush Management
Prescribed Grazing
Range Planting
Integrated Pest Management (IPM)

Restoration pathway R3A
State 3 to 2

With Brush Management, Prescribed Grazing, and Pest Management conservation practices, the Degraded Shortgrass State can be restored to the Shortgrass/Shrubland State.

Conservation practices

Brush Management
Prescribed Grazing
Integrated Pest Management (IPM)

Additional community tables

Table 9. Community 1.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production (lb/acre)	Foliar cover (%)
Grass/Grasslike
1	Shortgrasses			590–1640
	blue grama	BOGR2	Bouteloua gracilis	430–1200	–
	buffalograss	BODA2	Bouteloua dactyloides	110–300	–
	sideoats grama	BOCU	Bouteloua curtipendula	50–140	–
2	Midgrasses			35–100
	vine mesquite	PAOB	Panicum obtusum	18–50	–
	western wheatgrass	PASM	Pascopyrum smithii	17–50	–
3	Mid/shortgrasses			30–80
	silver beardgrass	BOLAT	Bothriochloa laguroides ssp. torreyana	0–20	–
	tumble windmill grass	CHVE2	Chloris verticillata	0–20	–
	Canada wildrye	ELCA4	Elymus canadensis	0–20	–
	squirreltail	ELEL5	Elymus elymoides	0–20	–
	sand muhly	MUAR2	Muhlenbergia arenicola	0–20	–
	James' galleta	PLJA	Pleuraphis jamesii	0–20	–
	sand dropseed	SPCR	Sporobolus cryptandrus	0–20	–
4	Forbs			40–115
	Forb, annual	2FA	Forb, annual	0–30	–
	Cuman ragweed	AMPS	Ambrosia psilostachya	0–30	–
	white sagebrush	ARLU	Artemisia ludoviciana	0–30	–
	rose heath	CHER2	Chaetopappa ericoides	0–30	–
	scarlet beeblossom	GACO5	Gaura coccinea	0–30	–
	dotted blazing star	LIPU	Liatris punctata	0–30	–
	sensitive plant	MIMOS	Mimosa	0–30	–
	scarlet globemallow	SPCO	Sphaeralcea coccinea	0–30	–
	Rocky Mountain zinnia	ZIGR	Zinnia grandiflora	0–30	–
Shrub/Vine
5	Shrubs			30–90
	tree cholla	CYIMI	Cylindropuntia imbricata var. imbricata	0–25	–
	jointfir	EPHED	Ephedra	0–25	–
	plains pricklypear	OPPO	Opuntia polyacantha	0–25	–
	yucca	YUCCA	Yucca	0–25	–
Tree
6	Trees			5–20
	hackberry	CELTI	Celtis	0–10	–
	Pinchot's juniper	JUPI	Juniperus pinchotii	0–10	–

Interpretations

Animal community

This site is used for the production of domestic livestock and to provide habitat for native wildlife. Cow-calf operations are the primary livestock enterprise although stocker cattle are also grazed. Sustainable stocking rates have declined drastically over the past 100 years due to deterioration of the historic climax plant community.

Initial starting stocking rates will be determined with the landowner or decision maker. An assessment of current vegetation is needed to determine stocking rates. Calculations used to determine an initial starting stocking rate will be based on forage production.

This site is important to many wildlife species. Major species include bobwhite and scaled quail, muledeer, pronghorn antelope, coyote, swift fox, jackrabbit, mourning dove, hawks, owls, and badger. Being in an open grassland, this site is also home to a variety of small herbivores, birds and their associated predators. Water development is very important to these and other wildlife on this site. The value of this site for food and cover requirements for specific wildlife species changes when the vegetative transitions that occur from one plant community to another. Each plant community and each animal species must be considered individually.

Hydrological functions

The water cycle on this site functions according to the existing plant community. The water cycle is most functional when the site is dominated by shortgrasses with a significant midgrass component. Good rainfall infiltration, high soil organic matter, good soil structure and good porosity are present with good grass cover. The quality of surface runoff will be high and erosion and sedimentation rates will be low.

When heavy grazing causes loss or reduction of forage production and ground cover, the water cycle becomes impaired. Infiltration is decreased and runoff is increased due to poor ground cover. Soil erosion is accelerated, the quality of surface runoff is poor and sedimentation is increased.

Recreational uses

This site is used for hunting large and small game.

Wood products

None.

Other products

None.

Other information

None.

Supporting information

Inventory data references

NRCS FOTG – Section II of the FOTG Range Site Descriptions and numerous historical accounts
of vegetative conditions at the time of early settlement in the area were used in the development of this site description. Vegetative inventories were made at several site locations for support documentation.

Two documents used include the NRCS FOTG - Section II - Range Site Descriptions and the NRCS Range 417 Clipping data summaries over a 20 year period.

Other references

J.R. Bell, USDA-NRCS Rangeland Management Specialist (retired)
Natural Resources Conservation Service - Range Site Descriptions
USDA-Natural Resources Conservation Service - Soil Surveys & Website soil database
Rathjen, Frederick W., The Texas Panhandle Frontier, Rev. 1998, Univ. of Texas Press
Hatch, Brown and Ghandi, Vascular Plants of Texas ( An Ecological Checklist )
Texas A&M Exp. Station, College Station, Texas
Texas Tech University – Range,Wildlife & Fisheries Dept.

Technical Review:
Mark Moseley, Oklahoma State RMS, NRCS, Stillwater, Oklahoma
Homer Sanchez, State RMS, NRCS, Temple, Texas
Tony Garcia, Zone RMS, NRCS, Lubbock, Texas
Clint Rollins, RMS, NRCS, Amarillo, Texas
Dr. Jack Eckroat, Grazing Lands Specialist, NRCS, Stillwater, Oklahoma
Justin Clary, RMS, NRCS, Temple, Texas

Contributors

Clint Rollins, RMS, NRCS, Amarillo, Texas
J.R. Bell
Steven McGowen, MLRA Office Leader, NRCS, Woodward, OK

Approval

Bryan Christensen, 9/12/2023

Acknowledgments

Site Development and Testing Plan
Future work, as described in a Project Plan, to validate the information in this Provisional Ecological Site Description is needed. This will include field activities to collect low, medium and high intensity sampling, soil correlations, and analysis of that data. Annual field reviews should be done by soil scientists and vegetation specialists. A final field review, peer review, quality control, and quality assurance reviews of the ESD will be needed to produce the final document.
Annual reviews of the Project Plan are to be conducted by the Ecological Site Technical Team.

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)	Stan Bradbury, Zone RMS, NRCS, Lubbock, Texas
Contact for lead author	806-791-0581
Date	09/04/2007
Approved by	Bryan Christensen
Approval date
Composition (Indicators 10 and 12) based on	Annual Production

Indicators

Number and extent of rills:
None to slight.
Presence of water flow patterns:
None to slight.
Number and height of erosional pedestals or terracettes:
None to slight.
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
25-30% bare ground.
Number of gullies and erosion associated with gullies:
None to slight.
Extent of wind scoured, blowouts and/or depositional areas:
None to slight.
Amount of litter movement (describe size and distance expected to travel):
None to slight.
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Very resistant to surface erosion.
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Clay loam; friable surface structure, loamy, high SOM.
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Basal cover and density will make rainfall impact minimal. This site is a moderately permeable soil, runoff is medium and available water holding capacity is high.
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
None.
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:
Warm-season shortgrasses >>

Sub-dominant:

Other:
Warm-season midgrasses > Forbs > Shrubs/Vines > Trees

Additional:
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Grasses due to their growth habit will exhibit some mortality and decadence, though minimal.
Average percent litter cover (%) and depth ( in):
Litter is dominantly herbaceous.
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
800 - 2,250 pounds per acre.
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:
Yucca, cholla, pricklypear, and juniper can be invasive.
Perennial plant reproductive capability:
All plant species should be capable of reproduction except during periods of prolonged drought conditions, heavy natural herbivory, or intense wildfires.

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Ecosystem states

1. Shortgrass/Blue grama State

2. Shortgrass/Shrubland State

3. Degraded Shortgrass State

T1A	-	Absence of disturbance and natural regeneration over time, may be coupled with excessive grazing pressure
R2A	-	Reintroduction of historic disturbance regimes, may be coupled with rangeland seeding
T2A	-	Absence of disturbance and natural regeneration over time, may be coupled with excessive grazing pressure
R3B	-	Reintroduction of historic disturbance regimes, may require rangeland seeding and other management practices
R3A	-	Reintroduction of historic disturbance regimes, may require rangeland seeding and other management practices