Ecological site R080BY161TX
Shallow Clay 26-33" PZ
Last updated: 10/10/2018
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.
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.
Major Land Resource Area (MLRA): 080B–Texas North-Central Prairies
MLRA 80B consists of gently rolling, dissected plains with very steep hillsides and sideslopes and narrow flood plains associated with small streams. Loamy and clayey soils range from very shallow to deep and developed in sandstones, shales, and limestones of Pennsylvanian age.
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 shallow clay soils on uplands. The reference vegetation consists of native perennial midgrasses and shortgrasses with scattered forbs and very few woody plants. Abusive grazing or other ground disturbance can lead to an increased amount of bare soil on these sites.
Claypan 26-33" PZ
Claypan Prairie site occupies the same landscape position and is frequently found adjacent to the Shallow Clay site.
Rocky Hill 26-33" PZ
Rocky Hill has a steeper slope and is found upslope of the Shallow Clay site.
Tight Sandy Loam 26-33" PZ
Tight Sandy Loam site occupies the same landscape position and is frequently found adjacent to the Shallow Clay site.
SHALLOW CLAY 24-29" PZ
Similar species and production in MLRA adjacent to northeastern counties.
Red Clay (South) 23-30" PZ
Similar species and production in MLRA adjacent to northwestern counties.
Shallow Clay 25-28" PZ
Similar species and production in MLRA adjacent to western counties.
Shallow Clay 30-38" PZ
Similar species and production in MLRA adjacent to southeastern counties.
Table 1. Dominant plant species
(1) Bouteloua curtipendula
This site occurs on linear to convex nose slopes, and side slopes of scarp slopes and ridges in the Texas North-Central Prairies. This site is characteristically a water distributing site.
Table 2. Representative physiographic features
|Runoff class||Very high|
|Elevation||750 – 2,400 ft|
|Slope||1 – 8%|
|Aspect||Aspect is not a significant factor|
The climate is subtropical subhumid and is characterized by hot humid summers and relatively mild winters. Tropical maritime air controls the climate during spring, summer and fall. In winter and early spring, frequent surges of polar Canadian air cause sudden drops in temperatures and add considerable variety to the daily weather. The average first frost generally occurs about November 5 and the last freeze of the season usually occurs about March 19. The average frost free period ranges from 215 days in the northern counties, to 240 days in the south.
The average relative humidity in mid-afternoon is about 60 percent in the summer months. Humidity is higher at night, and the average at dawn is about 80 percent. The sun shines 75 percent of the time possible during the summer and 50 percent in winter. The prevailing wind direction is from the southwest and highest windspeeds occur during the spring months.
Approximately 75% of annual rainfall occurs between April 1 and October 31. Rainfall during the months of April through September typically occurs during thunderstorms which tend to be intense and brief, resulting in large amounts of rain in a short time. The wettest months of the year are May, June, September, and October. The driest months during the growing season are July and August. The winter months of November, December, January, and February are the driest months overall.
Average annual precipitation for the entire MLRA is approximately 28 inches. There is a noticeable difference in the average annual precipitation in the northern counties in comparison to the southern and western counties of this Major Land Resource Area. Jack, Clay, Young, and Palo Pinto Counties all have an average annual precipitation of more than 31 inches. Stephens, Eastland, McCulloch, and San Saba Counties all have an average annual precipitation of less than 28 inches.
Winters tend to be mild, with occasional periods of very cold temperatures which can be accompanied by strong northerly winds and freezing precipitation. Snow is infrequent and significant accumulations are rare. These periods of very cold weather are generally short-lived. Summers tend to be hot and dry. Drought conditions are common during most summers. Air temperatures of more than 95oF are common from mid-June through September. In the northern counties nearest to the Red River, temperatures are generally slightly cooler during winter months and slightly warmer during summer months than in the other counties in the North Central Prairie.
Table 3. Representative climatic features
|Frost-free period (average)||240 days|
|Freeze-free period (average)||268 days|
|Precipitation total (average)||33 in|
Figure 2. Monthly precipitation range
Figure 3. Monthly average minimum and maximum temperature
Influencing water features
Representative soil components for this ecological site include: Owens
The site is characterized by shallow to moderately deep, well drained clayey soils.
Table 4. Representative soil features
|Drainage class||Well drained|
|Permeability class||Very slow|
|Soil depth||10 – 30 in|
|Surface fragment cover <=3"||20%|
|Surface fragment cover >3"||15%|
|Available water capacity
|3 – 4 in|
|Calcium carbonate equivalent
|2 – 15%|
|Sodium adsorption ratio
|Soil reaction (1:1 water)
|7.4 – 8.4|
|Subsurface fragment volume <=3"
(Depth not specified)
|4 – 11%|
|Subsurface fragment volume >3"
(Depth not specified)
|2 – 6%|
The reference plant community for the Shallow Clay ecological site is a midgrass/shortgrass prairie. Evidence of the historic vegetation can be found in the journals and records of explorers, military expeditions, boundary survey teams, and early scientists who studied the vegetation.
Climate is a major factor influencing vegetation on the site. Long-term droughts lasting multiple years or growing seasons are infrequent, but when they do occur, they can have a negative impact on the vegetation. If abusive grazing occurs during or immediately following the drought period, the results can be devastating. The effects of erratic seasonal moisture and short-term dry spells lasting a few months are not as severe as those caused by long-term droughts. However, the lower the ecological status of the site, the greater the negative impact will be during drought periods regardless of duration.
Fire was an important part of the ecosystem. Historic fires on this site were not as intense as they were on most associated sites because of the structure of the vegetation, and the relatively low amount of fine fuel to sustain the fires. The shorter height of the grasses and the scarcity of forbs and woody plants contributed to these less intense fires. However, fires of moderate to low intensity did play a key role in refreshing and reinvigorating the old growth vegetation and keeping weeds and brush suppressed.
Lack of fire allows herbaceous vegetation to become senescent and may eventually lead to the loss of the most desirable species. Seedlings of non-native brush species and invasive weeds may encroach on the site from adjacent sites
Prior to settlement, this site was subject to periodic grazing and browsing by vast herds of bison, wild cattle, wild horses, and deer. At times these grazing and browsing episodes were intense and severe, but periods of heavy use were followed by long periods of non-use as the herds migrated to fresh grazing areas before returning to previously grazed areas. The grazed areas had an opportunity to rest, regrow, regain vigor, and reproduce prior to the next grazing event. Intervals between grazing periods were frequently influenced by the amount of time that had elapsed since the last fire on the area.
As the region was settled, fire was reduced or eliminated and grasslands were fenced off to control movement and facilitate grazing by domestic livestock. As a result of abusive grazing or lack of grazing and/or the elimination of fire, in association with extreme climatic events, the historic plant community has been altered on most Shallow Clay sites.
This site usually occurs as small, isolated, and widely scattered areas within larger areas of other soils. Because of their dense clay subsoils, ponds and dams are often built on this site. This site is frequently overgrazed because it may be the only location of surface water in a pasture. The site is usually very slow to recover from overgrazing because of its dense, shallow soils. As the historic midgrasses decrease on the site, they are replaced by early successional midgrasses, a significant increase in the shortgrasses, as well as annual grasses and forbs. Further deterioration leads to the loss of the perennial midgrass plant community as shortgrasses, annual forbs, and annual grasses, begin to dominate the site. If disturbances are severe enough for an extended period of time, annual species dominate and bare ground is extensive. This provides the opportunity for less desirable woody species such as mesquite, lotebush, pricklypear, and tasajillo to encroach from adjacent sites.
Selective individual removal of unwanted trees and shrubs is relatively easy and more practical when brush plants initially appear on the site. The increase of brush can be fairly rapid and the plants per acre will soon become too numerous for individual control to be feasible. Once woody plants become mature or develop into dense stands, control is expensive, uneconomical, impractical, and difficult to achieve. Brush management is most successful using a systems approach. Initial treatment by mechanical methods can be followed by using approved herbicides, and using prescribed fire as a maintenance technique. Prescribed grazing with a reasonable stocking rate can sustain the grass species composition and production at a near reference level.
Changes in plant communities and vegetation states on the Shallow Clay site are result of the combined influences of natural events (rainfall, temperature, droughts, etc.) and the accompanying management systems implemented on the area (prescribed fire, grazing management, and brush management).
Rangeland Health Reference Worksheets have been posted for this site on the Texas NRCS website (www.tx.nrcs.usda.gov) in Section II of the eFOTG under (F) Ecological Site Descriptions.
State and Transitional Pathways:
The State and Transition Diagram which follows provides information on some of the most typical pathways that the vegetation on this site can follow as the result of natural events, management inputs, and application of conservation treatments. There may be other plant communities that can exist on this site under certain conditions. Consultation with local experts and professionals is recommended prior to application of practices or management strategies in order to ensure that specific objectives will be met.
State and transition model
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State 1 submodel, plant communities
Midgrass Prairie State
The reference plant community for the Shallow Clay ecological site is a Mid/Shortgrass Prairie Communtiy. In pristine conditions, the site is dominated by midgrasses. Buffalograss, curlymesquite, and hairy grama are sub-dominant shortgrasses. Blue grama is a minor, but significant, part of the historic shortgrass component on this site. Perennial forbs are scattered across the site. Shrubs are a minor component of the plant community. Annual production ranges from 1000 to 2800 pounds per acre. In the Short/Midgrass Community, sideoats grama declines and shortgrasses such as buffalograss and curlymesquite, dominate the site. More annual grasses and forbs begin to appear on the site. Mesquite, lotebush, pricklypear, and tasajillo begin to invade from adjacent sites and the shrub canopy begins to gradually increase. Annual production ranges from 900 to 2500 pounds per acre.
Mid/Shortgrass Prairie Community
The reference plant community for the Shallow Clay ecological site is a midgrass/shortgrass prairie. In pristine conditions, the site is dominated by sideoats grama with smaller amounts of cane and silver bluestem, Arizona cottontop, dropseeds, and vine mesquite. Buffalograss, curlymesquite, and hairy grama are sub-dominant shortgrasses. Blue grama is a minor, but significant, part of the historic shortgrass component on this site. Perennial forbs are scattered across the site. Shrubs are a minor component of the plant community. Annual production ranges from 1000 to 2800 pounds per acre.
Figure 5. Annual production by plant type (representative values) or group (midpoint values)
Table 5. Annual production by plant type
Figure 6. Plant community growth curve (percent production by month). TX3027, Mid/Shortgrass Prairie. Historic Climax Plant Community, Mid and Short grass Prairie..
Short/Midgrass Prairie Community
Sideoats grama declines because of disturbance or neglect as a result of uncontrolled grazing, lack of fire, climatic factors, or other factors. Shortgrasses such as buffalograss and curlymesquite, dominate the site along with midgrasses such as silver bluestem, dropseeds, and slim and rough tridens. Threeawns and Texas grama increase significantly. More annual grasses and forbs begin to appear on the site. Mesquite, lotebush, pricklypear, and tasajillo begin to invade from adjacent sites and the shrub canopy begins to gradually increase. Annual production ranges from 900 to 2500 pounds per acre.
Figure 8. Annual production by plant type (representative values) or group (midpoint values)
Table 6. Annual production by plant type
Figure 9. Plant community growth curve (percent production by month). TX3049, Shortgrasses/Midgrasses/No Shrubs Community. Shortgrass/Midgrass - buffalograss, curlymesquite, Texas wintergrass, sideoats grama, vine mesquite/No Shrubs or Trees..
Community 1.1 to 1.2
With uncontrolled grazing and no fires, the Mid/Shortgrass Prairie Community will shift to the Short/Midgrass Prairie Community.
Community 1.2 to 1.1
Applying conservation practices such as Prescribed Grazing and Prescribed Burning can restore the Short/Midgrass Prairie Community back to the Mid/Shortgrass Prairie Community.
Shortgrass Prairie State
The Shortgrass/Forb/Shrub Community is composed of perennial shortgrasses, including buffalograss, curlymesquite, and threeawns which dominate the site along with annual forbs and grasses. Invading shrubs increase in density and canopy. A few individual plants of sideoats grama and Arizona cottontop remain in isolated areas. Annual production ranges from 800 to 1400 pounds per acre.
This plant community is the result of prolonged periods of damaging disturbances and neglect which may include continuous abusive grazing and total lack of prescribed fire or brush management. Perennial shortgrasses, including buffalograss, curlymesquite, and threeawns dominate the site along with annual forbs and grasses. Invading shrubs such as mesquite, lotebush, and pricklypear increase in density and canopy, but their growth habit is stunted because of shallow soils, limited rooting depth, and lack of available moisture. A few individual plants of sideoats grama and Arizona cottontop remain in isolated areas, but silver bluestem, dropseeds, and white tridens are the most common midgrasses. Annual production ranges from 800 to 1400 pounds per acre.
Figure 11. Annual production by plant type (representative values) or group (midpoint values)
Table 7. Annual production by plant type
Figure 12. Plant community growth curve (percent production by month). TX3039, Shortgrass/Annuals/Mesquite/Shrubs Community. Shortgrass/Annuals/Mesquite and Shrubs – buffalograss, curlymesquite, broomweed, annual forbs and grasses, mesquite, lotebush.
Annuals/Bare Ground State
In the Annuals/Bare Ground Community, annual forbs such as broomweed are abundant. Stunted mesquite, lotebush, and pricklypear are scattered across the site. In the lowest stages of degradation, there is a significant amount of bare ground, and scalded areas are obvious. Annual production ranges from 500 to 800 pounds per acre.
Annuals/Bare Ground Community
Continued lack of fire and brush management along with uncontrolled grazing results in a plant community dominated by annual forbs and grasses. Annual forbs such as broomweed are abundant. Stunted mesquite, lotebush, and pricklypear are scattered across the site. In the lowest stages of degradation, there is a significant amount of bare ground, and scalded areas are obvious. Some of the scalds are the result of geologic erosion while others are the result of long-term abuse and mismanagement. This plant community is a terminal state that will not return to historic plant communities because of total degradation of the soil, and complete loss of most of the higher successional native plant species. Annual production ranges from 500 to 800 pounds per acre.
Figure 13. Annual production by plant type (representative values) or group (midpoint values)
Table 8. Annual production by plant type
Figure 14. Plant community growth curve (percent production by month). TX3039, Shortgrass/Annuals/Mesquite/Shrubs Community. Shortgrass/Annuals/Mesquite and Shrubs – buffalograss, curlymesquite, broomweed, annual forbs and grasses, mesquite, lotebush.
Converted Land State
Hundreds of thousands of acres have been plowed up and converted to cropland, pastureland, or hayland. This community is known as the Converted Land Community. Wheat is the primary annual crop. Bermudagrass is the primary introduced pasture species used in this area. Abandoned croplands and reseeded areas tend to revert back to a more natural state through the process of secondary succession. This is a very slow process that takes decades or centuries to evolve, dependent on the status of the area at the time it is abandoned. The first plants to establish are “pioneer plants” (annual forbs and grasses followed by early successional shortgrasses and midgrasses). This community is known as the Abandoned Land Community.
Converted Land Community
The Shallow Clay site is one of the sites that is poorly suited to use as cropland or intensively managed pastureland. The soils of this site are poorly suited to cultivation or conversion to pastureland because of poor soil-moisture-plant relationship, shallow root zones, and moderate slopes that are susceptible to erosion. A small amount of this site has been cultivated in the past, but very few acres are still planted to annual crops. Those limited areas of cropland remaining are planted to wheat or forage sorghum, but yields are usually low. King Ranch bluestem has been seeded on some areas that were formerly cropland.
Figure 15. Annual production by plant type (representative values) or group (midpoint values)
Table 9. Annual production by plant type
Figure 16. Plant community growth curve (percent production by month). TX3002, Cropland - Small Grains. Planted into small grains such as wheat or oats..
Figure 17. Plant community growth curve (percent production by month). TX3037, Converted Land Community. Planted to monocultures of introduced species, or monocultures or mixtures of commercially available native tallgrasses. .
Abandoned Land Community
The soils of this site are poorly suited to cultivation or conversion to pastureland. Therefore, most of the acres of this site that were cultivated in the past have been abandoned because of very low yields and poor economics. Abandoned croplands and reseeded areas tend to revert back to a more natural state through the process of secondary succession. This is a very slow process that takes decades or centuries dependent on the status of the area at the time it is abandoned. The first plants to establish are annual forbs and grasses followed by early successional shortgrasses and midgrasses. If managed properly, some of these abandoned areas may eventually begin to approximate the diversity and complexity of the historic Shallow Clay ecosystem. Midgrasses and perennial forbs may begin to establish if the area is carefully managed. However, it is highly unlikely that abandoned lands can ever return to climax vegetation within a reasonable period of time.
Figure 19. Annual production by plant type (representative values) or group (midpoint values)
Table 10. Annual production by plant type
Figure 20. Plant community growth curve (percent production by month). TX3038, Abandoned Land Community. Abandoned croplands, pasturelands and seeded areas..
Community 4.1 to 4.2
With abusive grazing, no fires, no brush management, idled land, no pasture/range/cropland management, the Converted Land Community will shift to the Abandoned Land Community.
Community 4.2 to 4.1
With the implementation of various conservation practices such as Prescribed Grazing, Prescribed Burning, Pasture/Crop Management, Seedbed Preparation, and Range/Pasture Planting, the Abandoned Land Community can be restored back to the Converted Land Community.
|Conservation Crop Rotation|
|Forage and Biomass Planting|
|Integrated Pest Management (IPM)|
State 1 to 2
With abusive grazing, no fires, and no brush management practices, the Midgrass Prairie State will transition into the Shortgrass Prairie State.
Restoration pathway R2A
State 2 to 1
The Shortgrass Prairie State can be restored to the Midgrass Prairie State with the use of various conservation practices including but not limited to Prescribed Grazing, Prescribed Burning, Brush Management, and Range Planting.
State 2 to 3
With the continuation of abusive grazing pressure, no fires and no brush management practices, the Shortgrass Prairie State will transition into the Annuals/Bare Ground State.
State 2 to 4
With Brush Management, Seedbed Preparation, Range, Pasture or Crop Cultivation, the Shortgrass Prairie State can transition into the Converted Land State.
Additional community tables
Table 11. Community 1.1 plant community composition
|Group||Common name||Symbol||Scientific name||Annual production (lb/acre)||Foliar cover (%)|
|little bluestem||SCSC||Schizachyrium scoparium||0–400||–|
|sideoats grama||BOCU||Bouteloua curtipendula||300–750||–|
|cane bluestem||BOBA3||Bothriochloa barbinodis||0–300||–|
|silver beardgrass||BOLAT||Bothriochloa laguroides ssp. torreyana||50–300||–|
|Drummond's dropseed||SPCOD3||Sporobolus compositus var. drummondii||50–250||–|
|hairy grama||BOHI2||Bouteloua hirsuta||50–250||–|
|Arizona cottontop||DICA8||Digitaria californica||0–200||–|
|blue grama||BOGR2||Bouteloua gracilis||0–200||–|
|Texas wintergrass||NALE3||Nassella leucotricha||50–200||–|
|vine mesquite||PAOB||Panicum obtusum||0–200||–|
|Hall's panicgrass||PAHAH||Panicum hallii var. hallii||0–150||–|
|slim tridens||TRMUE||Tridens muticus var. elongatus||0–150||–|
|slim tridens||TRMUM||Tridens muticus var. muticus||0–150||–|
|sand dropseed||SPCR||Sporobolus cryptandrus||0–150||–|
|white tridens||TRAL2||Tridens albescens||0–100||–|
|Reverchon's bristlegrass||SERE3||Setaria reverchonii||0–100||–|
|Texas cupgrass||ERSE5||Eriochloa sericea||0–100||–|
|hooded windmill grass||CHCU2||Chloris cucullata||0–100||–|
|tumble windmill grass||CHVE2||Chloris verticillata||0–100||–|
|Texas grama||BORI||Bouteloua rigidiseta||0–100||–|
|purple threeawn||ARPU9||Aristida purpurea||0–100||–|
|Wright's threeawn||ARPUW||Aristida purpurea var. wrightii||0–100||–|
|Engelmann's daisy||ENPE4||Engelmannia peristenia||0–150||–|
|white heath aster||SYERE||Symphyotrichum ericoides var. ericoides||0–150||–|
|fineleaf fournerved daisy||TELI3||Tetraneuris linearifolia||0–50||–|
|slender greenthread||THSI||Thelesperma simplicifolium||0–50||–|
|Texas vervain||VEHA||Verbena halei||0–50||–|
|prairie broomweed||AMDR||Amphiachyris dracunculoides||0–50||–|
|Cuman ragweed||AMPS||Ambrosia psilostachya||0–50||–|
|American star-thistle||CEAM2||Centaurea americana||0–50||–|
|Texas thistle||CITE2||Cirsium texanum||0–50||–|
|Queen Anne's lace||DACA6||Daucus carota||0–50||–|
|purple prairie clover||DAPU5||Dalea purpurea||0–50||–|
|Leavenworth's eryngo||ERLE11||Eryngium leavenworthii||0–50||–|
|curlycup gumweed||GRSQ||Grindelia squarrosa||0–50||–|
|Indian rushpea||HOGL2||Hoffmannseggia glauca||0–50||–|
|trailing krameria||KRLA||Krameria lanceolata||0–50||–|
|plains blackfoot||MELE2||Melampodium leucanthum||0–50||–|
|Nuttall's sensitive-briar||MINU6||Mimosa nuttallii||0–50||–|
|pony beebalm||MOPE||Monarda pectinata||0–50||–|
|upright prairie coneflower||RACO3||Ratibida columnifera||0–50||–|
|Drummond's skullcap||SCDR2||Scutellaria drummondii||0–50||–|
|gum bully||SILA20||Sideroxylon lanuginosum||0–150||–|
|honey mesquite||PRGL2||Prosopis glandulosa||0–100||–|
|catclaw acacia||ACGRG3||Acacia greggii var. greggii||0–100||–|
|Christmas cactus||CYLE8||Cylindropuntia leptocaulis||0–50||–|
|black prairie clover||DAFR2||Dalea frutescens||0–50||–|
|Berlandier's wolfberry||LYBE||Lycium berlandieri||0–50||–|
Historically, the Shallow Clay site was occasionally utilized by a variety mammals, reptiles, and birds. Several historical references and journals written in the 18th and 19th century by explorers, survey parties, and military expeditions refer to herds of bison, wild cattle, wild horses, and antelope roaming freely across the North Central Prairie and adjacent regions.
Today the site is primarily used by bob-white quail because of the scattered vegetation, amount of open ground, and presence of scattered, low-growing shrubs. The site may be utilized intermittently by deer, dove, species of grassland birds, and small fur-bearing mammals, but it is not a preferred site for most wildlife because of the relatively low and uniform structure of the vegetation, as well as the lack of trees, shrubs, and forbs. With the exception of quail, most wildlife only use this site incidentally in association with the use of more suitable adjacent sites. Animal species and populations fluctuate as the vegetation cycles through temporary phases and different ecological stages.
Livestock grazing should be controlled by implementing grazing management systems that incorporate frequent and timely deferment periods to prevent abusive grazing.
Plant Preference by Animal Kind:
These preferences are somewhat general in nature as the preference for a plant is dependent upon animals grazing experience, time of year, availability of choices, and total forage supply.
Preferred – Percentage of plant in animal diet is greater than it occurs on the land
Desirable – Percentage of plant in animal diet is similar to the percentage composition on the land
Undesirable – Percentage of plant in animal diet is less than it occurs on the land
Not Consumed – Plant would not be eaten under normal conditions. Only consumed when other forages not available.
Toxic – Rare occurrence in diet and, if consumed in any tangible amounts results in death or severe illness in animal
When herbaceous vegetation and ground cover are maintained in a healthy and vigorous status, water infiltration into the soil profile is increased, resulting in less runoff. However, infiltration rates are generally low and permeability is slow. Vegetation on this site is often sparse and interspersed with significant areas of bare ground. Overland water flow can cause significant erosion hazards particularly during intense rainfall periods. A thick, healthy grass cover will improve water quality because it serves as a filter or trap to reduce sediments and pollutants before the water flows offsite.
Because of the scarcity of trees and shrubs, the level terrain, characteristics of the soil, and the uniformity of the plant community, recreational use of this site is incidental and is generally associated with recreational use of adjacent sites. This site provides limited opportunities for outdoor activities such as hiking, camping, and horseback riding. Quail and dove hunting offer the most potential for recreation on this site.
Inventory data references
Vegetation data for this site was obtained from existing Range Site Descriptions, SCS-RANGE -417 Production and Composition Records for Native Grazing Lands, and on-site inventories by the author and local experts including ranchers, natural resource specialists from federal and state agencies, and personnel from cooperating agencies and organizations. A total of 9 SCS-RANGE-417’s containing data collected from 5 counties (Brown, Callahan, Lampasas, Palo Pinto and Wise)during the period 12/30/1981 to 12/12/1986 were reviewed for this site.
Ajilvsgi, Geyata. Wildflowers of Texas. Sharer Publishing, Bryan, TX. 1984.
Coffey, Chuck R., and Russell Stevens. Grasses of Southern Oklahoma and North Texas: A Pictorial Guide. The Samuel Roberts Noble Foundation, Ardmore, OK. 2004
Diggs, George M., Jr., Barney L. Lipscomb, and Robert J. O’Kennon. Illustrated Flora of North Central Texas. Botanical Research Institute of Texas. Fort Worth, TX 1999.
Enquist, Marshall. Wildflowers of the Texas Hill Country. Lone Star Botanical, Austin, TX. 1987.
Flores, Dan. “Indian Use of Range Resources” presented at 20th Annual Ranch Management Conference. Lubbock, TX, September 30, 1983.
Gould, Frank W., The Grasses of Texas. Texas A&M University Press, College Station, TX. 1975.
Hatch, Stephan L., Kancheepuram N. Gandhi, and Larry E. Brown. Checklist of the Vascular Plants of Texas. Texas Agricultural Experiment Station MP-1655. College Station, TX. 1990
Hatch, Stephan L., Jennifer Pluhar. Texas Range Plants. Texas A&M University Press, College Station, TX. 1993.
Kelton, Elmer. “History of Rancher Use of Range Resources” presented at 20th Annual Ranch Management Conference. Lubbock, TX, September 30, 1983.
Ladd, Doug. Tallgrass Prairie Wildflowers. Falcon Press, Helena and Billings, MT. 1995.
Parker, W.B. Through Unexplored Texas In The Summer and Fall of 1854. The Texas State Historical Commission. Austin, TX 1984
Smith, Jared G. Grazing Problems in the Southwest and How to Meet Them. United States Department of Agriculture Division of Agrostology. Washington, DC. 1899.
Texas Almanac Sesquicentennial Edition 1857-2007. Dallas Morning News. Dallas, TX. 2006.
Tyrl, Ronald J., Terrence G. Bidwell, and Ronald E. Masters. Field Guide to Oklahoma Plants. Oklahoma State University, Stillwater, OK. 2002.
United States Department of Agriculture Natural Resources Conservation Service, National Plant Data Center, Baton Rouge, LA. The PLANTS Database. http://plants.usda.gov 2007.
United States Department of Agriculture Natural Resources Conservation Service, Ag Handbook 296. Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin. 2006.
United States Department of Agriculture Natural Resources Conservation Service, Temple, TX. Shallow Clay Ecological Site Descriptions R078BY090TX and R078CY112TX. 2006.
United States Department of Agriculture Soil Conservation Service, Temple, TX. Production and Composition Record for Native Grazing Lands. SCS-RANGE 417 data from Brown, Eastland, Jack, Stephens, and Young Counties. 1981-1986.
United States Department of Agriculture Soil Conservation Service, Washington, DC. Web Soil Survey http://websoilsurvey.nrcs.usda.gov/app/. 2007
United States Department of Agriculture Soil Conservation Service, Temple, TX. Published Soil Surveys: Brown and Mills, Jack, Palo Pinto, Stephens, and Young Counties. Various publication dates.
United States Department of Agriculture Soil Conservation Service, Temple, TX. Range Site Descriptions for the North Central Prairie counties. Various publication dates.
Vines, Robert A. Trees of North Texas. University of Texas Press, Austin, TX. 1982
Weniger, Del. The Explorers’ Texas. Eakin Publications. Austin, TX. 1984.
Williams, Gerald W. References On The American Indian Use Of Fire in Ecosystems. United States Department of Agriculture – Forest Service, Washington, DC. 2005.
ACKNOWLEDGEMENTS: I would like to express my thanks and appreciation to the following for their cooperation, assistance, and support in the development of this Ecological Site Description:
Lake Brownwood State Park – Brownwood, TX
Ricky Marks, NRCS – Brownwood, TX
John Paclik, NRCS – Graham, TX
Misty Pearcy, NRCS – Brownwood, TX
Lem Creswell, RMS, NRCS, Weatherford, Texas
Justin Clary, RMS, NRCS, Temple, Texas
Dan Caudle, DMS Natural Resources Mgmt, Weatherford, Texas
Joe B. Norris, RMS, NRCS, Abilene, Texas
David Kraft, 10/10/2018
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)||Lem Creswell, Zone RMS, NRCS, Weatherford, Texas|
|Contact for lead author||817-596-2865|
|Approved by||Mark Moseley, NRCS, San Antonio, Texas|
|Composition (Indicators 10 and 12) based on||Annual Production|
Number and extent of rills:None.
Presence of water flow patterns:Deposition or erosion is uncommon during normal rainfall events, but may occur in limited areas during intense rainfall events.
Number and height of erosional pedestals or terracettes:Uncommon for this site.
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):Expect no more than 20% bare ground scattered randomly throughout the site.
Number of gullies and erosion associated with gullies:Few rills should occur. Some gullies may exist on side drains into intermittent streams.
Extent of wind scoured, blowouts and/or depositional areas:None.
Amount of litter movement (describe size and distance expected to travel):Little or no litter movement or deposition during normal rainfall events.
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):Soil surface in HCPC is resistant to erosion. Stability range is expected to be 5-6.
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):0-6 inches of Dark brown flaggy silty clay loam with subrounded to angular pebbles, cobbles, and stones. Has a strong fine granular structure. SOM is 1-4%. See soil survey for more information.
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:The midgrass/shortgrass prairie has scattered perennial forbs and very few shrubs. Little litter accumulation is expected. Moderate amounts of bare ground, shallow soils, low infiltration, and slow permeability provides for moderate infiltration and moderate runoff.
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 midgrasses > Warm-season shortgrasses >
Sub-dominant:Perennial Forbs >
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):Perennial grasses will naturally exhibit a minor amount (less than 5%) of senescence and some mortality every year.
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):1000 to 2800 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:Mesquite, lotebush, pricklypear, yucca, tasajillo, King Ranch bluestem, annual broomweed.
Perennial plant reproductive capability:All perennial species should be capable of reproducing every year unless disrupted by extended drought, overgrazing, wildfire, insect damage, or other events occuring immediately prior to, or during the reproductive phase.
The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.
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