Natural Resources
Conservation Service
Ecological site R080AY094OK
Wet Sandy Upland
Last updated: 9/19/2023
Accessed: 06/18/2026
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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): 080A–Central Rolling Red Prairies
MLRA 80A is characterized by dark red Permian rocks that are exposed on gently sloping plains. These plains are dissected by rivers that flow from northwest to southeast. Major rivers of this MLRA include the Chikaskia and Bluff rivers in KS, the Salt Fork, Cimarron, North and South Canadian, Washita, Cache, Red River in OK, and branches of the Wichita River in TX. Soils are generally well drained, loamy or clayey deposits overlying Permian sandstones or shales.
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 sand sheets between dunes and hummocks. They are unique due to the amount of plant available moisture. The water table on these sites may be as high as 24 inches below the soil surface. This available water in the soil profile allows for deep tooted tallgrasses to thrive as well as many forbs and legumes. Woody species may persist in small amounts. However, if these areas are subjected to abusive grazing practices, the more palatable tallgrass species may decline and be replaced with less palatable midgrass species.
Associated sites
R080AY014OK Deep Sand
Rolling sandy sites adjacent to wet sandy sites.
Similar sites
R080AY025OK Depressional Upland
Wet interdunal sites. Higher clay content and pond with water.
Table 1. Dominant plant species
Tree (1) Salix nigra
Shrub Not specified
Herbaceous (1) Panicum virgatum
Physiographic features
These sites occur on sand flats surrounded by sand hills.
These sites are non-flooded subirrigated sites located on nearly level valley floors, flats or depressions surrounded by sandhills or high terraces of the Central Rolling Red Prairies in MLRA 80A. These sites can also be found on the eastern side of MLRA 78C on very gently sloping to strongly sloping soils on side slopes that are parallel to drainageways and stream channels. When found on these side slopes, slope can range from 2 to 12 percent.Table 2. Representative physiographic features
Landforms (1) Plains > Sand sheet
(2) Plains > Interdune
Runoff class Negligible Elevation 1000 – 1500 ft Slope 0 – 2 % Water table depth 24 – 60 in Aspect Aspect is not a significant factor Climatic features
The climate is characterized by moist, cool, springs; hot, often dry summers; mild autumns; and mild to cold winters. Variation in timing and amounts of precipition from year to year is quite common. Drought cycles range from three to five years duration with occasionally longer periods occurring at unpredictable intervals. Above normal rainfall cycles are usually just as random, but shorter in duration.
Table 3 Representative climatic features
Frost-free period (characteristic range) 170-190 days Freeze-free period (characteristic range) 190-200 days Precipitation total (characteristic range) 30-40 in Frost-free period (actual range) 160-190 days Freeze-free period (actual range) 190-210 days Precipitation total (actual range) 30-40 in Frost-free period (average) 180 days Freeze-free period (average) 200 days Precipitation total (average) 40 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) WATONGA [USC00349364], Watonga, OK
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(2) PAULS VALLEY 4 WSW [USC00346926], Pauls Valley, OK
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(3) ANTHONY [USW00013980], Anthony, KS
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(4) STILLWATER 5 WNW [USW00053927], Stillwater, OK
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(5) OKEENE [USC00346629], Okeene, OK
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(6) WALTERS [USC00349278], Walters, OK
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(7) KINGFISHER [USC00344861], Kingfisher, OK
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(8) JEFFERSON [USC00344573], Medford, OK
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(9) CHEROKEE 4W [USC00341724], Cherokee, OK
">Influencing water features
These site are subject to endosaturation or episaturation for long periods during the year as well as run off from adjacent sand hills.
Wetland description
NA
Figure 8.
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 inclusional areas of additional Ecological Sites which are correlated to the minor components of that particular soil Mapunit.
Representative soil components for this site include:
Goltry
Soils in these sites are non-flooded calcareous eolian sands, sandy alluvium and/or eolian deposits or, in the eastern portion of the MLRA, re-worked loamy eolian deposits. These sites are found on nearly level valley floors, flats, depressions surrounded by sandhills.Table 4. Representative soil features
Parent material (1) Alluvium – sandstone
(2) Eolian sands – sandstone
Surface texture (1) Loamy fine sand
Drainage class Somewhat poorly drained Permeability class Moderately rapid to rapid Soil depth 60 – 0 in Surface fragment cover <=3" 0 – 1 % Surface fragment cover >3" 0 – 1 % Available water capacity
(0-40in)3 – 6 in Electrical conductivity
(0-40in)0 – 1 mmhos/cm Sodium adsorption ratio
(0-40in)0 – 1 Soil reaction (1:1 water)
(0-40in)5.5 – 7.5 Subsurface fragment volume <=3"
(Depth not specified)0 – 1 % Subsurface fragment volume >3"
(Depth not specified)0 – 1 % Ecological dynamics
The information contained in the State and Transition Diagram (STD) and the Ecological Site Description was developed using 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.
Plants growing on this site are able to grow in soil that is wet and sometimes saturated. In many places throughout the site, hydrophytic species may be found. Available water for plant growth is very high, too high for many upland species to grow. Productivity on this site is high in comparison to other plains sites. Diversity is excellent and the site is a favorite for many species of wildlife. The mixture of grasses, forbs, and woody plants make it very valuable for wildlife habitat. There is a good variety of both cool-season and warm-season plants. This site was perhaps more widespread in pre-settlement times before pressure was placed on aquifers and other water sources by irrigation, wells, and other human needs. Stream characteristics were also changed by impoundments. Today, many of these subirrigated sites are in danger of being lost due to declining water tables and poor management. Many of these sites are smaller than they were 30 to 50 years ago. Natural fire played an important role in ecological functions of most plains sites, especially the tallgrass communities. Tallgrasses such as big bluestem (Andropogon gerardii), switchgrass (Panicum virgatum), Eastern gamagrass (Tripsacum dactyloides), and Indiangrass (Sorghastrum nutans) were dependent upon fire to stimulate them and remove old growth that would accumulate on the soil surface. Fire also kept shrubs and other woody species suppressed while, very importantly, removing old fallen timber from trees such as cottonwood (Populus spp.). Grasslikes such as rushes (Scirpus spp.) and cattails (Typha spp.) accumulate more growth than do most tallgrasses; and can sometimes become dominant in the wetter parts of the site. Fire was a very important factor in maintaining balances between the many different vegetation types on this site. Fire was also important in maintaining wildlife habitat by opening up canopy cover and removing barriers to movement. The wet soil acts as an insulator, protecting plant roots and lower stems from heat damage, so, plant re-growth is rapid. The presence of water in the semi-arid plains attracts all kinds of grazers and predators as well as birds and small mammals. This site has an abundance of all habitat factors needed: water, nesting and escape cover, and a variety of food plants for turkey, quail, white tailed deer, as well as a multitude of other species of mammals and birds. Cattle find the site attractive as well and will spend too much time grazing and loafing in these areas if allowed to. The site can be grazed without damaging the plant community and the riparian characteristics if a time controlled grazing technique is used with proper stocking rates. However, this can be difficult to accomplish. Abusive grazing will see the taller grass species giving way to secondary succession species that are better adapted to cope with grazing pressure. There are many low order weedy species that also thrive in wet soils. These species will begin to dominate if improper management continues for extended periods of time. The unique characteristics of the site and the great differences from adjacent sites make special management necessary. Often, it may be beneficial to fence this site in such a way as to control and limit access by grazing animals. Occasionally, haying of the tallgrasses is a good alternative to grazing. Prescribed burning may be applicable in some cases to help sustain a diverse community.
State and Transition Diagram:
A State and Transition Diagram for the Wet Sandy Upland (R080AY094OK) 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 scenarioState and transition model
Custom diagramStandard diagram
Figure 9. R080AY094OK
More interactive model formats are also available. View Interactive Models
More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective textEcosystem states
State 1 submodel, plant communities
State 1
GrasslandDominant plant species
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black willow (Salix nigra), shrub
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switchgrass (Panicum virgatum), grass
Community 1.1
TallgrassThe reference plant community is a mixture of tallgrasses, some grasslike plants, forbs, and a very small shrub and tree component. This plant community is about 75 to 85 percent grasses, 10 to 15 percent forbs and 0 to10 percent shrubs and trees. Switchgrass usually dominates the plant community making up 25 to 30 percent of the vegetation although big bluestem or sand bluestem can be co-dominants with switchgrass. Eastern gamagrass, if present, can also be a dominant or co-dominant species. Other grass species important to the site are Indiangrass, Scribner’s panicum, purpletop, beaked panicum, and the wildryes. Important forbs include Illinois bundleflower, Maximillian sunflower, roundhead lespedeza and goldenrods. Common shrubs and trees found on site are cottonwoods, buttonbush, willow and indigobush. Because this site is subirrigated, and the water table is usually within 12 inches of the surface during the growing season, there is usually ample water for vegetation production. Annual production will vary from 4,000 pounds in unfavorable years to 7,000 pounds or more in favorable years. The production values in the following table are best estimates from limited clipping data and range observations. This site is one of the most consistent and most productive sites in MLRA 80A. The high range estimates of production give a good indication of each particular species’ production in relationship to all other listed species. The zero in the low production data does not necessarily indicate zero production per se, but simply indicates that the production will be somewhere within the low-high range, and, will most likely be between the average and the high.
Figure 10. 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 3280 4510 5740 Forb 400 550 700 Shrub/Vine 200 275 350 Tree 120 165 210 Total 4000 5500 7000 Figure 11. Plant community growth curve (percent production by month). OK0001 , Native, Warm Season Grasses. Typically, the summer growing season for warm season grasses begins April 5 to 15 and ends October 15 to 25. Nearly three-fourths of the season production will occur before the first of July. This varies from year to year depending upon temperatures and precipitation..
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 5 10 20 30 10 5 10 6 2 1 Community 1.2
MidgrassThis plant community is dominated by a mixture of midgrasses, tallgrasses, and shortgrasses. The tallgrasses and midgrasses are becoming co-dominant. Midgrasses may temporarily dominate the tallgrasses during periods of prolonged overgrazing or drought, but will quickly recover as conditions and management improve. Sedges and rushes are increasing. Most importantly, woody species are increasing. The decrease of tallgrasses and increase in woody species indicates that the site is heading towards a threshold. If the soil and water becomes a little saline because of a lowering of the water table, alkali sacaton and other saline-tolerant herbaceous species may start to show in the plant community.
Pathway 1.1A
Community 1.1 to 1.2If abusive grazing practices persist, the community may shift towards 1.2 as the less palatable species are able to dominate. Also, this shift could be the result of a lowering of the water table resulting in less plant available water.
Pathway 1.2A
Community 1.2 to 1.1With the implementation of a prescribed grazing system that includes growing season deferment, the community may shift towards the reference community 1.1. Also, this shift could occur as the result of a restored water table.
State 2
ConvertedThese sites are sometimes subjected to land use conversion to farmland or pastureland. Once cultivation occurs, the soil structure and biotic community is altered. Please contact local NRCS office or County Extension service for information regarding suitable crops and potential yields.
Dominant plant species
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Bermudagrass (Cynodon dactylon), grass
Transition T1A
State 1 to 2With cultivation and seeding, this site has been altered and has transitioned to an alternative ecological state. The soil properties have been altered significantly.
Transition T1A
State 1 to 2With cultivation and seeding, this site has been altered and has transitioned to an alternative ecological state. The soil properties have been altered significantly.
Additional community tables
Table 6. Community 1.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Grass/Grasslike1 Tallgrass 1960–3430 switchgrass PAVI2 Panicum virgatum 1000–1750 – sand bluestem ANHA Andropogon hallii 800–1400 – Indiangrass SONU2 Sorghastrum nutans 400–700 – eastern gamagrass TRDA3 Tripsacum dactyloides 0–560 – little bluestem SCSC Schizachyrium scoparium 0–560 – prairie cordgrass SPPE Spartina pectinata 0–450 – 2 Cool Season 200–350 Canada wildrye ELCA4 Elymus canadensis 0–180 – western wheatgrass PASM Pascopyrum smithii 0–180 – Texas bluegrass POAR Poa arachnifera 0–100 – Heller's rosette grass DIOL Dichanthelium oligosanthes 0–100 – 3 Mid/Shortgrasses 1000–1750 sideoats grama BOCU Bouteloua curtipendula 0–100 – blue grama BOGR2 Bouteloua gracilis 0–100 – silver beardgrass BOLA2 Bothriochloa laguroides 0–100 – fall witchgrass DICO6 Digitaria cognata 0–100 – foxtail barley HOJU Hordeum jubatum 0–100 – marsh muhly MURA Muhlenbergia racemosa 0–100 – vine mesquite PAOB Panicum obtusum 0–100 – thin paspalum PASE5 Paspalum setaceum 0–100 – Carolina canarygrass PHCA6 Phalaris caroliniana 0–100 – marsh bristlegrass SEPA10 Setaria parviflora 0–100 – alkali sacaton SPAI Sporobolus airoides 0–100 – composite dropseed SPCO16 Sporobolus compositus 0–100 – purpletop tridens TRFL2 Tridens flavus 0–100 – 4 Grasslike 120–210 sedge CAREX Carex 120–210 – Forb5 Forbs 400–700 Maximilian sunflower HEMA2 Helianthus maximiliani 0–180 – roundhead lespedeza LECA8 Lespedeza capitata 0–180 – pepperweed LEPID Lepidium 0–100 – lemon beebalm MOCI Monarda citriodora 0–100 – Missouri goldenrod SOMI2 Solidago missouriensis 0–100 – stenosiphon STENO2 Stenosiphon 0–100 – queen's-delight STSY Stillingia sylvatica 0–100 – white heath aster SYER Symphyotrichum ericoides 0–100 – prairie spiderwort TROC Tradescantia occidentalis 0–100 – Baldwin's ironweed VEBA Vernonia baldwinii 0–100 – hoary verbena VEST Verbena stricta 0–100 – camphorweed HESU3 Heterotheca subaxillaris 0–100 – annual marsh elder IVAN2 Iva annua 0–100 – Cuman ragweed AMPS Ambrosia psilostachya 0–100 – Indianhemp APCA Apocynum cannabinum 0–100 – wavyleaf thistle CIUN Cirsium undulatum 0–100 – whitemouth dayflower COER Commelina erecta 0–100 – Illinois bundleflower DEIL Desmanthus illinoensis 0–100 – fleabane ERIGE2 Erigeron 0–100 – American licorice GLLE3 Glycyrrhiza lepidota 0–100 – Shrub/Vine6 Shrub 200–350 false indigo bush AMFR Amorpha fruticosa 0–270 – common buttonbush CEOC2 Cephalanthus occidentalis 0–270 – willow baccharis BASA Baccharis salicina 0–100 – Tree7 Tree 120–210 eastern cottonwood PODE3 Populus deltoides 0–210 – black willow SANI Salix nigra 0–210 – American elm ULAM Ulmus americana 0–100 – common hackberry CEOC Celtis occidentalis 0–100 – roughleaf dogwood CODR Cornus drummondii 0–100 – Table 7. Community 1.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Animal community
Domestic livestock and white-tail deer are the dominant grazers and browsers of the site. Various songbirds and small mammals may also find use of these areas. As the site changes towards the woody dominated community, the quality of the habitat may improve for some species and decline for others. Management must be applied to maintain a vegetative state in optimum habitat quality for the desired animal species.
Hydrological functions
These site are subject to endosaturation or episaturation for long periods during the year as well as run off from adjacent sand hills.
Recreational uses
Camping, fishing, hunting, hiking, bird watching, horseback riding and many other outdoor recreational practices.
Wood products
There are no significant wood produts from this site.
Other products
NA
Other information
NA
Supporting information
Inventory data references
USDA-NRCS (Formerly Soil Conservation Service) Range Site Descriptions (1960s) USDA-NRCS draft ESDs (2000s)
Type locality
Location 1: Woods County, OK General legal description Woods County, Oklahoma; approximately 17 miles east and 12 miles south of Waynoka; 1850 feet north and 1500 feet east of the southwest corner of sec. 2, T. 22 N., R. 13 W References
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Anderson, R.C. 1982. An evolutionary model summarizing the roles of fire, climate, and grazing animals in the origin and maintenance of grasslands. Pages 297–308 in , , and , editors. Grasses and grasslands: systematics and ecology.
Other references
This site was included in an update project during 2013. The State &Transition model was re-formatted and the ESD was edited to fit the new ESIS format. The concepts and vegetative data contained therein was not altered. The entire ESD will be reviewed, updated, and subjected to the QC/QA processes as part of a future project. CW
USDA-NRCS (Formerly Soil Conservation Service) Range Site Descriptions (1960s)
USDA-NRCS (Formerly Soil Conservation Service) Ag Handbook 296 (2006)Contributors
Dr. Jack Eckroat, Grazing Lands Specialist, NRCS, Oklahoma
Edits by Colin Walden, Soil Survey Office, Stillwater, OKApproval
Bryan Christensen, 9/19/2023
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) Kay Anderson, David Kraft, Mark Moseley, Jack Eckroat, Harry Fritzler, Steve Glasgow Contact for lead author Date 04/01/2005 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
This site usually has flatter slopes and sandier soils. There are few, if any, rills. -
Presence of water flow patterns:
There is little, if any, evidence of soil deposition or erosion (some possibly apparent after significant rain events). Water generally flows evenly over the entire landscape. -
Number and height of erosional pedestals or terracettes:
There should not be any evidence of erosional pedestals or terracettes on this site. -
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
There is <5% bare ground on this site. Bare areas are small and not connected. -
Number of gullies and erosion associated with gullies:
None, drainages are represented as natural stable channels; vegetation is common with no signs of erosion. -
Extent of wind scoured, blowouts and/or depositional areas:
None. -
Amount of litter movement (describe size and distance expected to travel):
Uniform distribution of litter. Litter rarely moves >6 inches on flatter slopes and may be as much as doubled on steeper slopes, then only during high intensity storms. -
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Surface soil is stabilized (Stability Score 5-6). Stability scores based on a minimum of 6 samples tested. -
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Soil surface horizon intact. A horizon: 0 to 12 inches; brown fine sand, granular structure. B horizon: 12 to 30 inches; light yellowish brown. Loose. Refer to specific description for component sampled. -
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Infiltration and runoff are not affected by any changes in plant community composition and distribution. (Tallgrass/Midgrass dominated). Any changes in infiltration and runoff can be attributed to other factors (e.g. compaction -
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
There is usually no compaction layer. -
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:
TallgrassesSub-dominant:
Midgrasses, Cool-Season Perennial GrassesOther:
Forbs, ShrubsAdditional:
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Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
There is some plant mortality and decadence on the perennial grasses, especially in the absence of fire and herbivory, but usually <5%. -
Average percent litter cover (%) and depth ( in):
Litter should cover 50 - 75% of the area between plants with accumulations of <1inches deep. -
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
Reference production is 4,000 to 7,000 pounds/acre per year. -
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:
No invasive species. Invasives might include: eastern redcedar, locust, annuals and non-natives. -
Perennial plant reproductive capability:
All plants capable of reproducing at least every year.
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