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Ecological site R108XD821IA

Loamy Upland Drainageway Prairie

Last updated: 10/17/2024
Accessed: 11/21/2024

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General information

Provisional. A provisional ecological site description has undergone quality control and quality assurance review. It contains a working state and transition model and enough information to identify the ecological site.

MLRA notes

Major Land Resource Area (MLRA): 108X–Illinois and Iowa Deep Loess and Drift

The Illinois and Iowa Deep Loess and Drift, Western Part MLRA covers parts of both Iowa and Missouri and is known locally as part of the Southern Iowa Drift Plain. A silty loess deposit of varying thickness (5 to 20 feet) covers a series of glacial advances known collectively as pre-Illinoisan till. This till, deposited more than half a million years ago, was subjected to multiple instances of extreme erosion as well as periods of subdued erosion and intense weathering. The loess is thickest in the western part of the MLRA and generally thins eastward. In some areas, the loess has been removed and the older weathered till, called a “paleosol,” entirely exposed. These highly weathered soils, or paleosols, have a high content of clay, which slows the downward movement of water through the profile and causes water to move laterally instead of vertically. Wet areas, or “side-hill seeps,” commonly form where these paleosols become exposed along hillsides (Prior, 1991).

The dominant soil orders in this MLRA are Mollisols and Alfisols and, to a lesser extent, Entisols and Inceptisols. Most of the soils are Udolls or Udalfs. Aquolls are on the flatter interfluves. The soils in the area dominantly have a mesic soil temperature regime, an aquic or udic soil moisture regime, and mixed mineralogy. They generally are very deep, well drained to poorly drained, and silty, loamy, or clayey. These soils on uplands include somewhat poorly drained, nearly level Argiudolls (Macksburg series); moderately well drained, gently sloping to strongly sloping Argiudolls (Sharpsburg series); poorly drained, nearly level Argiaquolls (Winterset series); and well drained strongly, sloping to steep Hapludalfs (Gara, Lindley, Ladoga, and Armstrong series) (USDA-NRCS, 2006). The western part of the Illinois and Iowa Deep Loess and Drift is a segment of three other MLRAs within the Central Feed Grains and Livestock Region. The other areas are: the West-Central part (108C), the East-Central part (108B) and the Eastern part (108A).

Classification relationships

Major Land Resource Area (MLRA): Illinois and Iowa Deep Loess and Drift, Western Part (108D)

USFS Subregions: Central Dissected Till Plains Section (251C); Loess Hills (251Cb) and Central Dissected Till and Loess Plain (251Cc) Subsections (Cleland et al, 2007)

Relationship to Other Established Classifications:
NatureServe Classification: Ecological System: North-Central Interior Floodplain (9338); Ecological Association: Central Tallgrass Big Bluestem Loess Prairie (NatureServe, 2013)

Landfire Biophysical Setting: Central Tallgrass Prairie (4314210) (Landfire, 2009)

Ecological site concept

Loamy Upland Drainageway Prairies are within the red areas on the map (Figure 1). These sites formed local alluvium parent material and can be found in drainageways on uplands. Typically these sites are located down slope from wet upland prairie ecological sites and intermingled with wet upland drainageway prairies and loamy upland savanna ecological sites. Soils are typically Mollisols, characterized by deep, dark colored surfaces high in organic matter due to the dominant prairie vegetation and have no rooting restrictions. Plant communities consist of mostly grasses and few forbs and shrubs.

Associated sites

R108XD824IA	Wet Upland Drainageway Prairie Wet Upland Drainageway Prairie.
R108XD841IA	Loamy Footslope Savanna Loamy Footslope Savanna.
R108XD864IA	Wet Upland Prairie Wet Upland Prairie.

R108XD824IA

Wet Upland Drainageway Prairie

Wet Upland Drainageway Prairie.

R108XD841IA

Loamy Footslope Savanna

Loamy Footslope Savanna.

R108XD864IA

Wet Upland Prairie

Wet Upland Prairie.

Similar sites

F108XD851IA	Loamy Upland Drainageway Woodland Loamy Upland Drainageway Woodland.
R108XD824IA	Wet Upland Drainageway Prairie Wet Upland Drainageway Prairie.

F108XD851IA

Loamy Upland Drainageway Woodland

Loamy Upland Drainageway Woodland.

R108XD824IA

Wet Upland Drainageway Prairie

Wet Upland Drainageway Prairie.

Table 1. Dominant plant species

Tree	Not specified
Shrub	Not specified
Herbaceous	(1) Andropogon gerardii (2) Sorghastrum nutans

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Physiographic features

Loamy Upland Drainageway Prairies are of small extent, and can be found in drainageways in uplands in the northern part MLRA 108D. These sites are within a dissected till plain landscape. Slopes are generally less than 5 percent. These sites typically occur in upland drainageways where soil deposits from upslope wet upland prairies have accumulated

Figure 1. Block diagrams representing typical soil-landform sequences in Glacial Till Side/Footslopes. Red asterisks identify soil components correlated to Loamy Upland Drainageway Prairies.

Table 2. Representative physiographic features

Landforms	(1) Drainageway
Runoff class	Negligible to low
Flooding frequency	Occasional
Ponding frequency	None
Elevation	183 – 396 m
Slope	0 – 5%
Water table depth	122 – 183 cm
Aspect	Aspect is not a significant factor

Climatic features

The soil temperature regime of MLRA 108D is classified as “mesic” where the mean annual soil temperature is between 46 and 59°F (Soil Survey Staff, 2014). The average freeze-free period of this ecological site is about 166 days, while the frost-free period is about 144 days.

Average annual precipitation is 31 inches, which includes rainfall plus the water equivalent from snowfall.. The average annual low and high temperatures are 38 and 60°F, respectively.

Table 3. Representative climatic features

Frost-free period (characteristic range)	133-144 days
Freeze-free period (characteristic range)	157-174 days
Precipitation total (characteristic range)	889-940 mm
Frost-free period (actual range)	129-149 days
Freeze-free period (actual range)	149-176 days
Precipitation total (actual range)	889-965 mm
Frost-free period (average)	139 days
Freeze-free period (average)	164 days
Precipitation total (average)	914 mm

Characteristic range

Actual range

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Figure 2. Monthly precipitation range

Characteristic range

Actual range

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Figure 3. Monthly minimum temperature range

Characteristic range

Actual range

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Figure 4. Monthly maximum temperature range

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Figure 5. Monthly average minimum and maximum temperature

Figure 6. Annual precipitation pattern

Figure 7. Annual average temperature pattern

Climate stations used

(1) WINTERSET 1N [USC00139132], Winterset, IA
(2) GREENFIELD [USC00133438], Greenfield, IA
(3) GUTHRIE CTR [USC00133509], Guthrie Center, IA
(4) KNOXVILLE [USC00134502], Knoxville, IA
(5) MARYVILLE 2E [USC00235340], Maryville, MO
(6) INDIANOLA 2W [USC00134063], Indianola, IA

Influencing water features

Soils at this site are moderately well-drained and permeability is moderate. The soil at this site is in hydrologic group B (Hydrologic Soil Group, 2016). The land capability is class 1 (Land Capability Classification, 2016). Depth of endosaturation occurs at 4 to 6 feet. This ecological site contains first-order streams, which originate from headslope positions at the upper reaches of the units, and are fed from smaller headslopes in the adjacent uplands. The lower reaches of units
often contain second-order streams. These streams are ephemeral in most years, with flow in the late fall, winter, and spring months, generally disappearing in the summer, or reduced to isolated pools in the lower reaches. Stream levels typically respond quickly to storm events, especially in watersheds where surface runoff is dominant. Short-duration flooding is common in many areas.
Streambeds are typically incised into the surrounding floodplain by as much as 10 feet.

Soil features

These soils have no major rooting restriction. The soils were formed under prairie vegetation, and have dark, organic-rich surface horizons. Parent material is local alluvium. The soils have silt loam surface horizons (Table 5). Subsoils are silt loam. Soil series associated with this site include Kennebec.

Table 4. Representative soil features

Parent material	(1) Alluvium
Surface texture	(1) Silt loam
Drainage class	Moderately well drained
Permeability class	Moderately rapid
Soil depth	0 – 203 cm
Surface fragment cover <=3"	0%
Surface fragment cover >3"	0%
Available water capacity (Depth not specified)	32.26 – 35.56 cm
Calcium carbonate equivalent (Depth not specified)	0%
Soil reaction (1:1 water) (Depth not specified)	5.6 – 7.3

Ecological dynamics

Reference plant community is categorized as a mesic upland prairie and includes grasses and sedges, forbs, and shrubs. Species composition typically includes Andropogon gerardii, Schizachyrium scoparium, Sporobolus heterolepis, Sorghastrum nutans, Symphyotrichum ericoides, and Helianthus pauciflorus.

Fire, grazing, drought, are all disturbances influencing the dynamics at this site. These sites likely burned 3 to 5 times every 10 years. Grazing by whitetail deer, prairie elk, was common, and bison as well may have been also present grazing to a lesser extent. Disturbances from these animals removed thatch, litter, and reduced the proliferation of small trees and shrubs (Mutel, 2008).

As this region was settled, these prairies were typically altered to better suit agricultural needs. Corn and soybean production is common in these areas today. Very few small remnants of this prairie exist now.

State and transition model

Custom diagram

Standard diagram

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

State 1
Reference State

As a mesic tall grass prairie, this state has a reference plant community which is categorized as upland prairie and includes grasses and sedges, and forbs (Table 6). Extended periods with no fire and no grazing can cause this state to shift into a shrub-prairie. Conversely, Grazing and browsing accompanied by frequent or high intensity fires can ultimately shift this phase back towards the reference community. In addition, frequent fires followed by periods of no fire can cause an oak savanna phase to form.

Dominant plant species

big bluestem (Andropogon gerardii), grass
little bluestem (Schizachyrium scoparium), grass
prairie dropseed (Sporobolus heterolepis), grass

Community 1.1
Mesic Prairie

Tall grassland prairie ecosystem.

Dominant plant species

big bluestem (Andropogon gerardii), grass
little bluestem (Schizachyrium scoparium), grass
prairie dropseed (Sporobolus heterolepis), grass

Community 1.2
Shrub Prairie

Site invaded by shrub species.

Dominant plant species

dogwood (Cornus), shrub
sumac (Rhus), shrub
elm (Ulmus), shrub
eastern redcedar (Juniperus virginiana), shrub
big bluestem (Andropogon gerardii), grass
little bluestem (Schizachyrium scoparium), grass
prairie dropseed (Sporobolus heterolepis), grass

Pathway P1.1A
Community 1.1 to 1.2

Lack of fire 8 plus years, no grazing

Pathway P1.2A
Community 1.2 to 1.1

Grazing/browsing, frequent or higher intensity fires three years interval or less.

State 2
Crop Production State

A variety of crops may be produced on these sites depending on the landowners objectives. This state is the most common. Tillage, seeding and herbicide has destroyed all of the original prairie. Corn and soybeans are the principal crops. Variation in management within this state creates a wide range of soil properties and can be detrimental to the environment.

Community 2.1
Conventional tillage field

Corn and soybean rotation is most common crops on these sites; however, many different crops can be produced depending on the landowner objectives..

Community 2.2
Conservation tillage alternative crop field

corn and soybean rotation with alfalfa rotation

Pathway P2.1A
Community 2.1 to 2.2

less tillage; residue management; crop rotation

Pathway P2.2A
Community 2.2 to 2.1

Intensive tillage; less residue; mono-culture cropping.

State 3
Cool Season Pasture State

A native reference state transformed into a cool season pasture due to a suppression of fire and heavy grazing by livestock. Very little inputs to the original reference state make this state a possibility for restoration to the reference state. This path would need prescribed fire, grazing, and a reduction of cool season grasses by using a selective herbicide. With a combination of inputs of non- selective herbicide and inter-seeding, the semi-native pasture transitions to a non-native pasture. Continual management is required to prevent invasion of shrubs. This can occur if the site is overgrazed and seeding and herbicide are discontinued

Community 3.1
Semi Native Pasture

mostly cool season grasses with some natives

Community 3.2
Non Native Pasture

cool season grasses and legumes

Community 3.3
Shrub Invaded Pasture

cool season grasses invaded by multiflora rose, honeylocust, black locust, eastern red cedar.

Pathway P3.1A
Community 3.1 to 3.2

Herbicide, interseeding

Pathway P3.2A
Community 3.2 to 3.1

Overgrazing; lack of seeding/herbicide

Pathway P3.2B
Community 3.2 to 3.3

Abandonment

Pathway P3.3A
Community 3.3 to 3.2

Brush management, herbicide, seeding

State 4
Early Successional Woody Invaded Forest State

Abandonment of the shrub invaded pasture for 20 or more years will result in a woody invaded forest consisting of larger DBH honey locust and red cedar. At this state a significant amount of input and resources would be required to reverse the invaded woody species (Woodland Health, 2004).

Dominant plant species

honeylocust (Gleditsia triacanthos), tree
eastern redcedar (Juniperus virginiana), tree

Community 4.1
Woody Invaded Forest

larger dbh honey locust and red cedar

Dominant plant species

honeylocust (Gleditsia triacanthos), tree
eastern redcedar (Juniperus virginiana), tree

State 5
Reconstructed Prairie State

Prairie reconstruction is accomplished through site preparation, herbicide, brush management seeding and tillage. Careful management and planting/seeding of forbs or natural propagation will further develop this from an early successional ruderal prairie to a late successional prairie.

Dominant plant species

big bluestem (Andropogon gerardii), grass
Indiangrass (Sorghastrum nutans), grass
switchgrass (Panicum virgatum), grass

Community 5.1
Early Successional Ruderal Prairie

Seeding prairie species in early development

Community 5.2
Late Successional Prairie

Mix of tallgrass species and native forbs

Pathway P5.1A
Community 5.1 to 5.2

Natural forb reseeding or by mechanical planting/seeding

Pathway P5.2A
Community 5.2 to 5.1

Forb failure due to drought and or poor seeding methods

Transition T1A
State 1 to 2

Tillage, seeding, herbicide.

Transition T1B
State 1 to 3

Plowing, seeding, grazing

Restoration pathway R3A
State 3 to 1

Prescribed fire, grazing, herbicides

Transition T3B
State 3 to 2

Sodbuster, tillage, seeding

Transition T3A
State 3 to 4

Abandonment 20 years plus

Transition T3C
State 3 to 5

site preparation, herbicide, brush management, seeding

Additional community tables

Supporting information

Inventory data references

No field plots were available for this site. A review of the scientific literature and professional experience were used to approximate the plant communities for this provisional ecological site. Information for the state-and-transition model was obtained from the same sources. All community phases are considered provisional based on these plots and the sources identified in ecological site description.

Other references

Cleland, D.T., J.A. Freeouf, J.E. Keys, G.J. Nowacki, C. Carpenter, and W.H. McNab. 2007. Ecological Subregions: Sections and Subsections of the Conterminous United States. USDA Forest Service, General Technical Report WO-76. Washington, DC.

Landfire. 2009. Biophysical Setting 4314210 Central Tallgrass Prairie. In: Landfire National Vegetation Dynamics Models. USDA For. Serv. and U.S. Department of Interior. Washington, DC.

Mutel, Cornelia F. 2008. The Emerald Horizon: The History of Nature in Iowa. University of Iowa Press.

NatureServe. 2013. Associations and alliances of Iowa. St. Paul, Minnesota.

Prior, Jean Cutler. 1991. Landforms of Iowa. University of Iowa Press. Iowa City, Iowa.

Soil Survey Staff. 2014. Keys to Soil Taxonomy, 12th ed. USDA-Natural Resources Conservation Service, Washington, DC.

United States Department of Agriculture, Natural Resources Conservation Service. 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin. USDA Handbook 296.

United States Department of Agriculture, Natural Resources Conservation Service. Hydrologic Soil Group. National soil survey handbook, title 430-VI. http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_054223#39 accessed August 29, 2016.

United States Department of Agriculture, Natural Resources Conservation Service. Land Capability Classification. National soil survey handbook, title 430-VI.
http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2_054226#02 accessed August 29, 2016.

Woodland Health: Stewardship Options for Iowa Woodland Owners. 2004. Iowa Natural Heritage Foundation. Des Moines, Iowa.

Contributors

John Hammerly (john.hammerly@usda.gov)
Dan Pulido (dan.pulido@usda.gov)

Approval

Suzanne Mayne-Kinney, 10/17/2024

Acknowledgments

This ESD was originally approved prior to April 2021.

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)	John Hammerly, soil scientist Dan Pulido, SSOL
Contact for lead author
Date	11/21/2024
Approved by	Suzanne Mayne-Kinney
Approval date
Composition (Indicators 10 and 12) based on	Annual Production

Indicators

Number and extent of rills:
Presence of water flow patterns:
Number and height of erosional pedestals or terracettes:
Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
Number of gullies and erosion associated with gullies:
Extent of wind scoured, blowouts and/or depositional areas:
Amount of litter movement (describe size and distance expected to travel):
Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
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:

Sub-dominant:

Other:

Additional:
Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
Average percent litter cover (%) and depth ( in):
Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
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:
Perennial plant reproductive capability:

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Natural ResourcesConservation Service

Ecological site R108XD821IA

Loamy Upland Drainageway Prairie

Last updated: 10/17/2024 Accessed: 11/21/2024

General information

MLRA notes

Classification relationships

Ecological site concept

Associated sites

Similar sites

Table 1. Dominant plant species

Ecosystem states

State 1 submodel, plant communities

State 2 submodel, plant communities

State 3 submodel, plant communities

State 4 submodel, plant communities

State 5 submodel, plant communities

Natural Resources
Conservation Service

Last updated: 10/17/2024
Accessed: 11/21/2024