Natural Resources
Conservation Service
Ecological site R077DY049TX
Very Shallow
12-17" PZ
Last updated: 9/11/2023
Accessed: 08/26/2026
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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): 077D–Southern High Plains, Southwestern Part
This MLRA 77D is characterized by nearly level to gently undulating plains with scattered playa depressions. Soil temperature regime is thermic and soil moisture regime is aridic bordering on ustic. Sandy and loamy soils are generally well drained and range from shallow to deep and medium- to coarse-textured. Native vegetation is short- to midgrasses and sandy sites support tallgrasses with sand shin oak and mesquite. Current land use is mainly rangeland, although irrigated cropland is expanding.
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
These sites occur on very shallow soils on uplands. The reference vegetation consists of shortgrasses with some midgrasses and forbs. Woody species are rarely present in the reference plant community. Abusive grazing practices may lead to a decrease in palatable plants and a shift in the plant community. Woody species may increase in the absence of periodic fire.
Associated sites
R077DY042TX Limy Upland 12-17" PZ
Very shallow sites can be found adjacent to Limy Upland sites, MLRA 77D. The Limy Upland sites will occur as gently undulating soils that occur on broad upland plains. Midgrasses dominate but there is a good mixture of shortgrasses on this site. Production is higher on the Limy Upland sites.
R077DY047TX Sandy Loam 12-17" PZ
Sandy Loam sites, MLRA 77D, can be found adjacent to Very Shallow sites as deeper soils on nearly level plains. Midgrasses dominate but some tallgrasses and shortgrasses can occur on this site. Production is higher on Sandy Loam sites.
R077DY048TX Shallow 12-17" PZ
Shallow sites, MLRA 77D, can be found adjacent to Very Shallow sites as slightly deeper soils on nearly level plains. Midgrasses dominate but a good mixtrue of shortgrasses occurs on this site. Production is similar between Shallow and Very Shallow sites.
R077DY046TX Sandy 12-17" PZ
Sandy sites, MLRA 77D, can be found adjacent to Very Shallow sites as deeper soils on nearly level plains. Midgrasses dominate but there is a good mixture of tallgrasses on this site. Production is similar on the Sandy sites.
Similar sites
R077DY048TX Shallow 12-17" PZ
Shallow sites, MLRA 77D, will have slightly deeper soils on nearly level plains. Shallow sites have similar vegetation with slightly higher production potential.
R077CY037TX Very Shallow 16-21" PZ
Very Shallow sites, MLRA 77C, have similar forage plant communities with higher production potential due to higher annual precipitation (16 - 21 inches).
R077EY068TX Very Shallow 16-24" PZ
Very Shallow sites, MLRA 77E, have similar forage plant communities with higher production potential due to higher annual precipitation (16 - 24 inches).
Table 1. Dominant plant species
Tree Not specified
Shrub (1) Ephedra
(2) Acacia greggiiHerbaceous (1) Bouteloua eriopoda
(2) Bouteloua gracilisPhysiographic features
Soils correlated in the MLRA 77D Very Shallow ecological site are very shallow to shallow to a petrocalcic horizon. They were formed in moderately fine textured eolian sediments of the Blackwater Draw Formation of Pleistocene age. These soils are typically on gently sloping plains, narrow ridges, and side slopes along draws. Slope ranges from 0 to 3 percent.
Landforms include Plain, Ridge, and Playa rims.Table 2. Representative physiographic features
Landforms (1) Plateau > Plain
(2) Plateau > Playa rim
(3) Plateau > Ridge
Runoff class Medium to high Flooding frequency None Ponding frequency None Elevation 2500 – 4600 ft Slope 0 – 3 % Water table depth 80 in Aspect W, NW, N, NE, E, SE, S, SW Climatic features
Continental Steppe climate is prevalent in MLRA 77D. This climate type is typical of interiors of continents and is characterized by large variations in the magnitude of ranges in daily temperature extremes, low relative humidity, and irregularly spaced rainfall of moderate amounts. This climate regime is also known for being semi-arid with mild winters.
Droughts occur with monotonous frequency although there will be years having excessive precipitation resulting in large accumulations of water that little benefit is obtained from the rainfall events. If good rains occur in the spring and summer months, annual production will be favorable even if the remainder of the year is not favorable. Most of the annual precipitation occurs as a result from spring and early summer thunderstorms. Due to the fact that the area is mainly flat, local flooding may occur but only of short duration. There is very little precipitation and infrequent snowfall amounts in the winter.
During the late winter and early spring months, dust storms occur very frequently. The flat plains of the area contribute very little resistance to the strong winds. Dust in many of these storms remains in the air for several days after the storms have passed.
Daytime temperatures are warm in the summer but there is a large diurnal range and most nights are comfortable. In summers, the normal daily maximum temperatures are in the low to mid 90s and the normal minimum temperatures are in the upper 60s and low 70s. Even though the temperatures may be high, the low humidity and high evaporation rates create a cooling effect during the nighttime hours. Fall months exhibit extremely variable weather. Winters are mild and are characterized by frequent cold fronts accompanied by strong, gusty, northerly winds. Most of the cold fronts are dry as they pass through the area.Table 3 Representative climatic features
Frost-free period (characteristic range) 150-190 days Freeze-free period (characteristic range) 180-190 days Precipitation total (characteristic range) 20-20 in Frost-free period (actual range) 150-200 days Freeze-free period (actual range) 170-210 days Precipitation total (actual range) 20-20 in Frost-free period (average) 170 days Freeze-free period (average) 190 days Precipitation total (average) 20 in Characteristic rangeActual rangeBarLineFigure 2. Monthly precipitation range
Characteristic rangeActual rangeBarLineFigure 3. Monthly minimum temperature range
Characteristic rangeActual rangeBarLineFigure 4. Monthly maximum temperature range
BarLineFigure 5. Monthly average minimum and maximum temperature
Figure 6. Annual precipitation pattern
Figure 7 Annual average temperature pattern
Climate stations used
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(1) MELROSE [USC00295617], Melrose, NM
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(2) ELIDA [USC00292854], Elida, NM
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(3) CROSSROADS 2 [USC00292207], Crossroads, NM
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(4) CAPROCK [USC00291445], Caprock, NM
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(5) TATUM [USC00298713], Tatum, NM
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(6) HOBBS 13W [USC00294030], Lovington, NM
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(7) ANDREWS [USC00410248], Andrews, TX
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(8) ODESSA SCHLEMEYER FLD [USW00003031], Odessa, TX
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(9) K-BAR RCH [USC00414710], Odessa, TX
">Influencing water features
Water features are not an influencing factor in this site.
Wetland description
None.
Soil features
The soils of this site are very shallow, well drained, calcareous, gravelly soils. Permeability is moderate and runoff is low to medium. Parent material is a thin mantle of medium to moderately coarse textured eolian sediments over an indurated layer.
Major Soil Taxonomic Units correlated to this site include: Eunice soils, Kimbrough soils, Simona soils and Spraberry soils.Table 4. Representative soil features
Parent material (1) Eolian deposits – igneous, metamorphic and sedimentary rock
Surface texture (1) Loam
(2) Gravelly loam
(3) Fine sandy loam
(4) Loamy fine sand
Family particle size (1) Loamy
Drainage class Well drained Permeability class Moderate to rapid Depth to restrictive layer 4 – 20 in Soil depth 4 – 20 in Surface fragment cover <=3" 0 – 10 % Surface fragment cover >3" 0 – 10 % Available water capacity
(0-20in)0.5 – 2 in Calcium carbonate equivalent
(0-20in)0 – 60 % Electrical conductivity
(0-20in)0 – 1 mmhos/cm Sodium adsorption ratio
(0-20in)0 – 1 Soil reaction (1:1 water)
(0-20in)6.6 – 8.4 Subsurface fragment volume <=3"
(0-20in)0 – 60 % Subsurface fragment volume >3"
(0-20in)0 – 3 % Ecological dynamics
The Reference Plant Community of the Very Shallow Ecological Site is a Shortgrass/Midgrass Community (1.1). Few if any tallgrass species will be found. Grass species account for 85 percent of the total site production. A wide variety of forbs are produced on this site producing 15 percent of the total annual production. Only trace amounts of woody shrubs will be found. This site occupies flat to moderately sloping upland areas. Slopes typically range from 1 to 12 percent. These are shallow to very shallow loam to fine sandy loam soils with a depth of 4 to 20 inches that are underlain by indurated caliche or soft caliche.
The dominant shortgrass species are black grama (Bouteloua eriopoda) and blue grama (Bouteloua gracilis), with lesser amounts of buffalograss (Bouteloua dactyloides), Wright threeawn (Aristida wrightii), hairy grama (Bouteloua hirsuta), and fall witchgrass (Digitaria cognata). The dominant midgrass species are sideoats grama (Bouteloua curtipendula), little bluestem (Schizachyrium scoparium), plains bristlegrass (Setaria macrostachya), Arizona cottontop (Digitaria californica), tobosagrass (Pleuraphis mutica), slim tridens (Tridens muticus), and lesser amounts of sand dropseed (Sporobolus cryptandrus) and Reverchon bristlegrass (Setaria reverchonii). A good variety of forbs exist but the amount varies greatly from year to year depending on moisture. The more commonly found forbs are dotted gayfeather (Liatris punctata), white prairie clover (Dalea albiflora), gaura spp. (Gaura spp.), bush sunflower (Simsia calva), orange zexmania (Zexmania hispida), trailing ratany (Krameria lanceolata), Oenothera spp. (Oenothera spp.), and rock daisy (Perityle spp.). The few shrubs that may be found on this site were feather dalea (Dalea Formosa), catclaw acacia (Acacia greggii), and vine ephedra (Ephedra antisyphilitica).
Fire plays a role in the ecology of this site as well as most other high plains sites. The general role of fire is to sustain the natural grassland and suppress shrubby species. Fire has helped to keep a balance between the grasses, forbs and shrubs. However, in the shortgrass region, fire is probably secondary to climate in promoting the historic vegetative state. A drier climate (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 textEcosystem states
T1A - Absence of disturbance and natural regeneration over time, may be coupled with excessive grazing pressure R2A - Adequate rest from defoliation and removal of woody canopy, followed by reintroduction of historic disturbance regimes State 1 submodel, plant communities
State 2 submodel, plant communities
State 1
Grassland StateThe Reference Plant Community was a Shortgrass/Midgrass Community (1.1). Few if any tallgrass species will be found. Grass species account for 85 percent of the total site production. A wide variety of forbs are produced on this site producing 15 percent of the total annual production and only trace amounts of woody shrubs will be found.
With continuous heavy grazing, no fire, no brush management and/or pest management this site will transition to the Shortgrass/Shrub Community (1.2). As livestock and wildlife numbers increase and grazing use exceeds a plants ability to sustain defoliation, the more palatable and generally more productive species decline in stature, productivity and density. The tendency of this site is to become a shortgrass dominant site if long-term grazing abuse occurs. This will lead to a decline in sideoats grama, blue grama and other palatable grass species.Dominant plant species
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black grama (Bouteloua eriopoda), grass
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blue grama (Bouteloua gracilis), grass
Community 1.1
Shortgrass/Midgrass Community
Figure 8. 1.1 Shortgrass/Midgrass Community
The Reference Plant Community of the Very Shallow Ecological Site is a Shortgrass/Midgrass Plant Community (1.1). Few if any tallgrass species will be found. Grass species account for 85 percent of the total site production. A wide variety of forbs are produced on this site producing 15 percent of the total annual production. Only trace amounts of woody shrubs will be found. The dominant shortgrass species are black grama and blue grama. Sideoats grama is the primary midgrass species.
As overgrazing occurs on this site, there will be a reduction of the less grazing resistant midgrass species, a decline in mulch and organic matter, and consequently a reduction in intensity and frequency of fires. The shift in plant cover to less palatable shortgrass species and the decline in soil cover, favors woody plant encroachment. Proper grazing use, periodic brush and pest management and prescribed burning are required to maintain this community phase.Figure 9. 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 285 618 950 Forb 15 32 50 Shrub/Vine 0 0 1 Tree 0 0 0 Microbiotic Crusts 0 0 0 Total 300 650 1001 Figure 10. Plant community growth curve (percent production by month). TX1251 , Warm-season bunchgrasses w/ forbs & shrubs. Warm-season bunchgrasses with forbs and shrubs..
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 3 5 12 16 15 20 18 9 1 0 Community 1.2
Shortgrass/Shrubs Community
Figure 11. 1.2 Shortgrass/Shrubs Community
With continuous heavy grazing, no fire, no brush management and/or pest management this site will transition from to the Shortgrass/Shrub Community (1.2). As livestock and wildlife numbers increase and grazing use exceeds a plants ability to sustain defoliation, the more palatable and generally more productive species decline in stature, productivity and density. The tendency of this site is to become a shortgrass dominant site if long-term grazing abuse occurs. This will lead to a decline in sideoats grama, blue grama and other palatable grass species. Black grama, dropseeds and tobosa will increase with an invasion of hairy tridens, and burrograss. Catclaw acacia will increase along with an invasion of broom snakeweed, and mesquite. The production of vegetation has shifted from mostly herbaceous vegetation to increasing amounts of woody shrubs. Herbaceous vegetation is still the largest production in this state.
This state can shift back to the reference community with good management practices such as prescribed grazing, brush management and pest management. In this state it is unlikely that prescribed burning could be used due to the limited fuel load and poor continuity to carry a fire.Figure 12. 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 200 350 500 Shrub/Vine 200 300 400 Forb 40 70 100 Microbiotic Crusts 0 0 0 Tree 0 0 0 Total 440 720 1000 Figure 13. Plant community growth curve (percent production by month). TX1252 , Shortgrass Dominant/Invading Shrub Community. Warm-season shortgrasses with increasing shrubs and forbs..
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 3 5 12 16 15 20 18 9 1 0 Pathway 1.1A
Community 1.1 to 1.2
Shortgrass/Midgrass Community
Shortgrass/Shrubs CommunityWith continuous heavy grazing, no fire, no brush management and/or pest management this site will transition to the Shortgrass/Shrub Community (1.2). As livestock and wildlife numbers increase and grazing use exceeds a plants ability to sustain defoliation, the more palatable and generally more productive species decline in stature, productivity and density.
Pathway 1.2A
Community 1.2 to 1.1
Shortgrass/Shrubs Community
Shortgrass/Midgrass CommunityThis state can transition back the reference community with good management practices such as prescribed grazing, brush management and pest management.
Conservation practices
Brush Management Integrated Pest Management (IPM) Prescribed Grazing State 2
Shrubland StateA major threshold will be crossed from the Grassland State (1.0) to the Shrubland State (2.0). In this state, mesquite, shrubs such as broom snakeweed and catclaw acacia will dominate the site. The typical shortgrass species will be perennial threeawns, hairy tridens and other invading low quality short grasses. Bare areas will increase with annuals filling the voids. The loss of herbaceous cover and increased bare soil encourages accelerated erosion, especially on sites with steeper slopes.
Dominant plant species
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broom snakeweed (Gutierrezia sarothrae), shrub
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catclaw acacia (Acacia greggii), shrub
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honey mesquite (Prosopis glandulosa), shrub
Community 2.1
Shrub/Shortgrass Community
Figure 14. 2.1 Shrub/Shortgrass Community
If long-term, heavy grazing continues with no fire or any form of brush and pest management, a major threshold will be crossed to the Shrub/Shortgrass Community (2.1). In this state, mesquite, broom snakeweed and catclaw acacia will dominate the site. The typical shortgrass species will be perennial threeawns, hairy tridens and other invading low quality short grasses. Bare areas will increase with annuals filling the voids. The loss of herbaceous cover and increased bare soil encourages accelerated erosion, especially on sites with steeper slopes. Nutrient cycling, the water cycle, watershed protection and biological functions have been severely reduced.
The plant community is so degraded that it cannot reverse retrogression without extensive energy and management inputs. Prescribed grazing with rest periods during the growing season, re-seeding with adapted native grass species, chemical and/or mechanical brush management, and some form of pest management will be required to return this state back to the reference state. With the reduced amounts of grass fuel, poor continuity and increased bare soil, prescribed burning will not be an option in this state.Figure 15. 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)Shrub/Vine 400 500 600 Grass/Grasslike 100 200 300 Forb 20 40 60 Microbiotic Crusts 0 0 0 Tree 0 0 0 Total 520 740 960 Figure 16. Plant community growth curve (percent production by month). TX1254 , Shrub/Shortgrass/Annuals Community. Spring and fall growth of shortgrasses, annuals, and shrubs..
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 10 16 15 20 15 12 1 0 Transition T1A
State 1 to 2If long-term, heavy grazing continues with no fire or any form of brush and pest management, a major threshold will be crossed to the Shrub/Shortgrass Community (2.1). In this state, mesquite, broom snakeweed and catclaw acacia will dominate the site. Bare areas will increase with annuals filling the voids.
Restoration pathway R2A
State 2 to 1Prescribed grazing with rest periods during the growing season, re-seeding with adapted native grass species, chemical and/or mechanical brush management, and some form of pest management will be required to return this state back the reference. With the reduced amounts of grass fuel, poor continuity and increased bare soil, prescribed burning will not be an option in this state.
Conservation practices
Brush Management Range Planting Integrated Pest Management (IPM) Prescribed Grazing Additional community tables
Table 8. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Grass/Grasslike1 Shortgrasses 105–350 black grama BOER4 Bouteloua eriopoda 75–250 – blue grama BOGR2 Bouteloua gracilis 30–100 – 2 Midgrasses 135–450 sideoats grama BOCU Bouteloua curtipendula 30–100 – little bluestem SCSC Schizachyrium scoparium 30–100 – large-spike bristlegrass SEMA5 Setaria macrostachya 15–50 – Arizona cottontop DICA8 Digitaria californica 15–50 – tobosagrass PLMU3 Pleuraphis mutica 15–50 – slim tridens TRMUE Tridens muticus var. elongatus 15–50 – Reverchon's bristlegrass SERE3 Setaria reverchonii 8–25 – sand dropseed SPCR Sporobolus cryptandrus 7–25 – 3 Shortgrasses 45–150 Wright's threeawn ARPUW Aristida purpurea var. wrightii 15–50 – buffalograss BODA2 Bouteloua dactyloides 15–50 – hairy grama BOHI2 Bouteloua hirsuta 8–25 – fall witchgrass DICO6 Digitaria cognata 7–25 – Forb4 Forbs 50–100 dotted blazing star LIPU Liatris punctata 8–16 – evening primrose OENOT Oenothera 6–12 – rockdaisy PERIT Perityle 6–12 – awnless bushsunflower SICA7 Simsia calva 6–12 – whiteflower prairie clover DAAL Dalea albiflora 6–12 – beeblossom GAURA Gaura 6–12 – trailing krameria KRLA Krameria lanceolata 6–12 – Shrub/Vine5 Shrubs 0–1 catclaw acacia ACGRG3 Acacia greggii var. greggii 0–1 – featherplume DAFO Dalea formosa 0–1 – clapweed EPAN Ephedra antisyphilitica 0–1 – Table 9. Community 1.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 10. Community 2.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Animal community
This site is inhabited by dove, quail, deer and pronghorn. Limited populations of pronghorn antelope frequent the site. The limited amount of woody plants does not provide good cover and food sources for deer.
Hydrological functions
Surface runoff is moderate to rapid on these soils due to the percent slope. Water erosion is slight where the vegetative cover is good, but overgrazed areas are subject to severe water erosion hazards.
Recreational uses
This site has very little value from an aesthetic standpoint. The site is occupied almost exclusively by native short and midgrass species with few woody shrubs. Recreational activities could include bird hunting, camping, hiking, bird watching, photography, and horseback riding.
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. Inventory Data References (documents): NRCS FOTG – Section II - Range Site Descriptions NRCS 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 – Department of Natural Resources Management, Lubbock, Texas
Technical Reviewers and Contributors:
Mark Moseley, RMS, NRCS, Boerne, Texas
Justin Clary, RMS, NRCS, Temple, TexasContributors
Clint Rollins, RMS, NRCS, Amarillo, Texas
Todd Carr, SS, NRCS, Lubbock, TexasApproval
Bryan Christensen, 9/11/2023
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. Mark Moseley, RMS, NRCS, Boerne, Texas Justin Clary, RMS, NRCS, Temple, Texas
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 02/09/2010 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
Due to percent slopes, rills will be common. -
Presence of water flow patterns:
Due to percent slopes, water flow patterns will be common. -
Number and height of erosional pedestals or terracettes:
Due to percent slopes, pedestals/terracettes will be common. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
25-30% mineral soil, low percentage due to rock fragments scattered throughout the soil profile. -
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):
Moderate resistance to surface erosion. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Loamy friable surface; low SOM. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Low vegetative cover and percent slopes make this site susceptible to erosion. This site is a moderately permeable soil, runoff is medium and available water holding capacity is very low. -
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 > Warm-season midgrasses >>Sub-dominant:
Other:
Forbs > Shrubs/VinesAdditional:
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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):
300 to 1,000 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:
Catclaw acacia, broom snakeweed, and mesquite can become 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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