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Conservation Service

Ecological site F113XY920IL

Silty Floodplain Forest

Last updated: 5/17/2024
Accessed: 07/21/2026

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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): 113X–Central Claypan Areas

The eastern Illinois portion of the Central Claypan Areas MLRA is in the Till Plains Section of the Central Lowland Province of the Interior Plains (USDA-NRCS, 2006) and includes the Southern Till Plain Natural Division of the natural divisions of Illinois (Schwegman, 1973; 1997; IDNR, 2018) in south-central Illinois. South-central Illinois is a dissected Illinoisan till plain south of the terminal Wisconsin moraine. This region consists of nearly level to gently sloping, old till plains. Stream valleys are shallow and generally are narrow. Elevation is about 660 feet (200 meters), increasing gradually from south to north. Local relief is generally low on the broad, flat till plains and flood plains and high on the dissected hills bordering rivers or drainage systems. The Kaskaskia, Little Muddy, Little Wabash, Embarras, and Skillet Fork rivers are part of this area. This region is covered with loess, which overlies old glacial drift (Illinoisan till) that has a high content of clay. Fragipans are also present. Pennsylvanian limestone and shale bedrock underlay the glacial till. The dominant soil orders in this region are Alfisol and Mollisol. The soils in the area predominantly have a mesic soil temperature regime, an aquic or udic soil moisture regime, and mixed or smectitic mineralogy. They generally are very deep, well drained to poorly drained, and loamy or clayey. (USDA-NRCS, 2006).

Classification relationships

Major Land Resource Area (MLRA) (USDA-NRCS, 2006):
113 – Central Claypan Areas, Eastern Part
U.S. Forest Service Ecoregions (Cleland et al. 2007):
Domain: Humid Temperate Domain
Division: Hot Continental Division
Province: Eastern Broadleaf Forest (Continental)
Province Code: 222
Section: Central Till Plains, Oak-Hickory Section
Section Code: 222G

Ecological site concept

The historic pre-European settlement vegetation on this site was dominated by a variable canopy cover of deciduous trees with an understory of shade-tolerant shrubs and ground flora (LANDFIRE 2009; Nelson 2010; White 1978). They occur on nearly level to gently undulating flood plains of rivers and large streams. Soils are moderately well to well drained and very deep, formed in silty alluvium (SSS NRCS OSD, 2018).

Silty Floodplain Forests resemble Loamy Floodplain Forests, except they lack the variety of oak species (Quercus spp.). Stands are dominated by American sycamore (Platanus occidentalis L.)*, with a mixture of other species, including silver maple (Acer saccharinum L.), white ash (Fraxinus americana L.), green ash (Fraxinus pennsylvanica Marshall), black walnut (Juglans nigra L.), American elm (Ulmus americana L.), and slippery elm (Ulmus rubra Muhl.). Shrubs include pawpaw (Asimina triloba (L.) Dunal) and northern spicebush (Lindera benzoin (L.) Blume). Vines may be abundant, including Virginia creeper (Parthenocissus quinquefolia (L.) Planch.) and eastern poison ivy (Toxicodendron radicans (L.) Kuntze). Herbaceous species include Jack in the pulpit (Arisaema triphyllum (L.) Schott), Canadian wildginger (Asarum canadense L.), smallspike false nettle (Boehmeria cylindrica (L.) Sw.), Virginia wildrye (Elymus virginicus L.), Canadian clearweed (Pilea pumila (L.) A. Gray), jumpseed (Polygonum virginianum L.), and others. (LANDFIRE 2009; Nelson 2010; NatureServe 2018; Voigt and Mohlenbrock 1964). Historically, seasonal flooding was the primary disturbance factor, while windthrow events and beaver alterations were secondary factors.

*All plant common and scientific names in this document were obtained from the U.S. Department of Agriculture – Natural Resources Conservation Service National PLANTS Database (USDA NRCS, 2018).

Associated sites

F113XY911IL	Loamy Till Backslope Forest This ecological site is located on steep backslopes above Silty Floodplain Forests.
F113XY919IL	Wet Silty Floodplain Forest This ecological site is located in the floodplain on silty water sediments in low lying areas.
F113XY922IL	Loamy Floodplain Forest This ecological site has well drained coarse-loamy water sediments found on narrow flood plains, natural levees, and floodplain steps.
F113XY921IL	Wet Loamy Floodplain Forest This ecological site is located in the floodplain in coarse-loamy water sediments with a high water table.

Similar sites

F113XY922IL	Loamy Floodplain Forest This ecological site is located stream river courses and is better drained. Species composition is similar but oak species are more common.

F113XY922IL

Loamy Floodplain Forest

This ecological site is located stream river courses and is better drained. Species composition is similar but oak species are more common.

Table 1. Dominant plant species

Tree	(1) Platanus occidentalis (2) Juglans nigra
Shrub	(1) Ulmus rubra
Herbaceous	(1) Boehmeria cylindrica (2) Elymus virginicus

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Physiographic features

This site occurs on nearly level to gently undulating flood plains of rivers and large streams with slopes of less than 2 percent (Table 1). Areas not protected by levees are subject to flooding (SSS NRCS OSD, 2018).

Table 2. Representative physiographic features

Landforms	(1) Alluvial plain > Flood plain
Runoff class	Negligible to low
Flooding frequency	None to frequent
Elevation	328 – 705 ft
Slope	0 – 3 %
Water table depth	21 – 72 in
Aspect	Aspect is not a significant factor

Climatic features

The soil temperature regime of MLRA 113 is classified as mesic, where the mean annual soil temperature is between 47 and 59°F. Temperature and precipitation occur along a north-south gradient, where temperature and precipitation increase the further south you travel (USDA-NRCS 2006). The majority of the precipitation occurs as rainfall in the form of convective thunderstorms during the growing season.

Table 3 Representative climatic features

Frost-free period (characteristic range)	160-170 days
Freeze-free period (characteristic range)	190-200 days
Precipitation total (characteristic range)	40-40 in
Frost-free period (actual range)	150-170 days
Freeze-free period (actual range)	190-200 days
Precipitation total (actual range)	40-40 in
Frost-free period (average)	160 days
Freeze-free period (average)	190 days
Precipitation total (average)	40 in

Characteristic range

Actual range

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Figure 1. Monthly precipitation range

Characteristic range

Actual range

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Figure 2. Monthly minimum temperature range

Characteristic range

Actual range

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Figure 3. Monthly maximum temperature range

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Figure 4. Monthly average minimum and maximum temperature

Figure 5. Annual precipitation pattern

Figure 6 Annual average temperature pattern

Climate stations used

(1) VANDALIA [USC00118781], Vandalia, IL
(2) CHARLESTON [USC00111436], Charleston, IL
(3) NASHVILLE 1 E [USC00116011], Nashville, IL

Influencing water features

This ecological site is in floodplains of perennial streams. They are influenced by a seasonal water table and flooding. The water table may be within 2 to 3 feet of the surface in late fall through spring, receding in the summer. Stream levels typically respond quickly to storm events, especially in watersheds where surface runoff is dominant. Short to medium duration flooding is common in many areas, particularly during spring and early summer storm events. (SSS NRCS WSS, 2018). (SSS NRCS OSD, 2018).

Soil features

These soils are moderately well to well drained with moderately slow permeability and are very deep. Organic matter content is variable. Parent material is silty alluvium (fine-silty and coarse-silty particle size family classes). They have silt loam surface horizons. Soils of this ecological site are in the Mollisol and Inceptisol orders. Soil series associated with this site include Sharon, Raddle, and Wilbur. (NCSS, 2018; SSS NRCS OSD, 2018)

Table 4. Representative soil features

Parent material	(1) Alluvium
Surface texture	(1) Silt loam
Family particle size	(1) Fine-silty (2) Coarse-silty
Drainage class	Moderately well drained to well drained
Permeability class	Moderately slow
Soil depth	72 in
Surface fragment cover <=3"	Not specified
Surface fragment cover >3"	Not specified
Available water capacity (Depth not specified)	8 – 9 in
Electrical conductivity (Depth not specified)	0 – 2 mmhos/cm
Sodium adsorption ratio (Depth not specified)	Not specified
Soil reaction (1:1 water) (Depth not specified)	4.5 – 7.8
Subsurface fragment volume <=3" (Depth not specified)	Not specified
Subsurface fragment volume >3" (Depth not specified)	Not specified

Ecological dynamics

The MLRA lies within the transition zone between the eastern deciduous forests and the central tallgrass prairies. The heterogeneous topography of the area results in variable microclimates and fuel matrices that in turn are able to support prairies, savannas, woodlands, and forests. Silty Floodplain Forests form an aspect of this vegetative continuum. This ecological site occurs on nearly level to gently undulating floodplains of rivers and large streams. Species characteristic of this ecological site consist of broadleaf deciduous floodplain forest species with a high canopy diversity. (Anderson, 1975; White, 1978; NatureServe 2009).

Historically, the floodplains were a very dynamic system with frequent flooding. Gravelly, sandy, loamy, and clayey deposits of sediment sorted themselves out on the floodplain depending on the speed, volume and duration of the waters carrying them. Silty Floodplain Forests occupy a transitional area between lower, wetter and more clayey forests and higher, better drained riverfront forests. They have silty soil textures and are moderately well to well drained. Current management of the river has drastically altered this dynamic process of these floodplain forest communities.

Historic flooding of Silty Floodplain Forest occurred annually in this region or at least once every three years. Flooding typically occurs during the winter and spring. Although this community can be early-successional, occurring on river fronts and other recently disturbed areas, this is a generally long-lived type. Succession in Silty Floodplain Forest appears to be similar to that of the Loamy Floodplain Forests. Elms, ashes, black walnut and American sycamore form a tall canopy (80 to 100 feet) that is uneven and has frequent holes.

Catastrophic floods will often partially or completely knock down trees. Alluvial deposition varies and slight ridges may favor hackberry, while depressions will favor green ash. Species variability and composition within this community are considerable as a result of a mosaic of moisture conditions controlled by seasonal flooding and local topography. (NatureServe 2018)

Today many of these ecological sites have been cleared and converted to intensive agriculture. Several of these cleared fields have retained a narrow strip of forest along the stream, but some of these ecological sites are often cleared right up to the bank (Figure 2). In such cases, severe flooding may cause stream bank erosion and complete loss of this ecological site. The remaining remnants that still exist play an important role as a source of food and shelter for migrating birds. In addition, large floodplain trees that extend above the canopy are important nesting sites for bald eagles (Haliaeetus leucocephalus) and herons (Ardea spp.). (Guyon et. al. 2016)

Carefully planned timber harvests can be tolerated in this system, but high grading of the timber will eventually degrade the ecological site. Re-establishment of these riparian forests is important for stream quality and health, as well as for migratory birds. Planting of appropriate species has proven to be quite successful.

A provisional state and transition diagram is depicted in Figure 3. Detailed descriptions of each state, transition, plant community, and pathway follow the model. This model is based on available experimental research, field observations, professional consensus, and interpretations. It may change as knowledge increases.

State and transition model

Custom diagram

Standard diagram

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 text

Ecosystem states

1. Reference State

2. Logged Forest

3. Cool Season Grassland

4. Cropland

T1A	-	Lack of natural disturbance events >20 years; repeated timber harvests
T1B	-	Woody removal; vegetative seeding; grassland management
T1C	-	Woody removal; tillage; conservation cropping system; water management
R2A	-	Forest stand improvement
T2A	-	Woody removal; vegetative seeding; grassland management
T2B	-	Woody removal; tillage; conservation cropping system; water management
T3A	-	Tillage; conservation cropping system; water management
T4A	-	Vegetative seeding; grassland management

State 1 submodel, plant communities

1.1. American Sycamore - Black Walnut/Slippery Elm/ Smallspike False Nettle - Virginia Wildrye

1.2. American Sycamore - Black Walnut/Slippery Elm - Pawpaw/ Virginia Wildrye

1.1A	-	No disturbance events for over 10 years
1.2A	-	Natural disturbance 1-3 years

State 1
Reference State

The historical reference state for this ecological site was old growth floodplain forest. The forest was dominated by American sycamore, ashes and elms. Eastern black walnut was a common component. Maximum tree age was likely 150 to 300 years. Periodic disturbances from flooding, wind or ice maintained the open, uneven structure and ground flora species. Long disturbance-free periods allowed an increase in both the density of trees and the abundance of shade tolerant species.

Two community phases are recognized in the reference state, with shifts between phases based on disturbance frequency. Reference states are very rare today. Altered drainage has resulted in increased canopy density, which has affected the abundance and diversity of ground flora. Most former reference states are currently altered because of timber harvesting, clearing and conversion to grassland or cropland.

Dominant plant species

American sycamore (Platanus occidentalis), tree
black walnut (Juglans nigra), tree
slippery elm (Ulmus rubra), shrub
Virginia wildrye (Elymus virginicus), grass
smallspike false nettle (Boehmeria cylindrica), other herbaceous

Community 1.1
American Sycamore - Black Walnut/Slippery Elm/ Smallspike False Nettle - Virginia Wildrye

This community is characterized by American sycamore, black walnut, slippery elm and a diverse understory including smallspike false nettle and Virginia wildrye. Disturbance events are every 1-3 years.

Dominant plant species

American sycamore (Platanus occidentalis), tree
black walnut (Juglans nigra), tree
slippery elm (Ulmus rubra), tree
Virginia wildrye (Elymus submuticus), grass
smallspike false nettle (Boehmeria cylindrica), other herbaceous

Community 1.2
American Sycamore - Black Walnut/Slippery Elm - Pawpaw/ Virginia Wildrye

This community show an increase in woody species due to longer disturbance intervals.

Dominant plant species

American sycamore (Platanus occidentalis), tree
black walnut (Juglans nigra), tree
pawpaw (Asimina triloba), shrub
Virginia wildrye (Elymus virginicus), grass

Pathway 1.1A
Community 1.1 to 1.2

Lack of natural disturbance events for over 10 years.

Pathway 1.2A
Community 1.2 to 1.1

Natural disturbance events 1-3 years.

State 2
Logged Forest

Composition is altered from the reference state depending on tree selection during harvest. This state will slowly increase in more shade tolerant species with selective harvesting techniques. Without periodic canopy disturbance, stem densities and more shade tolerant species will increase in abundance. Some periodic uncontrolled grazing may be occurring.

Dominant plant species

silver maple (Acer saccharinum), tree
elm (Ulmus), tree
American sycamore (Platanus occidentalis), tree
roughleaf dogwood (Cornus drummondii), shrub
sedge (Carex), grass

Community 2.1
Silver Maple - Elm - American Sycamore/ Roughleaf Dogwood/ Sedge

Species composition is altered from the reference state due to disturbances.

Dominant plant species

elm (Ulmus), tree
American sycamore (Platanus occidentalis), tree
silver maple (Acer saccharinum), tree
roughleaf dogwood (Cornus drummondii), shrub
sedge (Carex), grass

State 3
Cool Season Grassland

Conversion of other states to non-native cool season species such as tall fescue (Schedonorus arundinaceus (Schreb.) Dumort., nom. cons.), red top (Agrostis alba auct. non L.) and white clover (Trifolium repens L.) has been common. Occasionally, these pastures will have scattered pecans. Long term uncontrolled grazing can cause significant soil erosion and compaction. A return to the reference state may be impossible, requiring a very long term series of management options and transitions.

Dominant plant species

tall fescue (Schedonorus arundinaceus), grass
white clover (Trifolium repens), other herbaceous

Community 3.1
Tall Fescue - Red Top - White Clover

A community dominated by seeded cool season grasses and legumes.

Dominant plant species

tall fescue (Schedonorus arundinaceus), grass
creeping bentgrass (Agrostis stolonifera), grass
white clover (Trifolium repens), other herbaceous

State 4
Cropland

This is a state that exists currently with intensive cropping of corn (Zea mays L), soybeans (Glycine max (L.) Merr.), and wheat (Triticum aestivum L.). Some conversion to cool season hay land occurs, but when commodity prices are high, these states transition back to cropland.

Dominant plant species

corn (Zea mays), grass
wheat (Triticum), grass
soybean (Glycine max), other herbaceous

Community 4.1
Corn, Soybeans, Wheat

Agricultural state with crops such as corn, beans, and winter wheat.

Dominant plant species

corn (Zea mays), grass
wheat (Triticum), grass
soybean (Glycine max), other herbaceous

Transition T1A
State 1 to 2

Lack of natural disturbance events for 20 years or more. Repeated timber harvesting may have occurred.

Transition T1B
State 1 to 3

Woody removal; vegetative seeding; grassland management

Transition T1C
State 1 to 4

Woody removal and tillage of the site. Conservation cropping system and water management often occurs.

Restoration pathway R2A
State 2 to 1

Forest stand improvement

Transition T2A
State 2 to 3

Woody removal; vegetative seeding; grassland management

Transition T2B
State 2 to 4

Woody removal; tillage; conservation cropping system; water management

Transition T3A
State 3 to 4

Tillage; conservation cropping system; water management

Transition T4A
State 4 to 3

Vegetative seeding; grassland management

Additional community tables

Table 5. Community 1.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 6. Community 1.2 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 7. Community 2.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 8. Community 3.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

Table 9. Community 4.1 plant community composition

Group	Common name	Symbol	Scientific name	Annual production ()	Foliar cover (%)

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 and ecological dynamics 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 the sources identified in ecological site description.

References

Mohlenbrock R. H. and D. M. Ladd. 1978. Distribution of Illinois Vascular Plants. Southern Illinois Univ. Press, Carbondale and Edwardsville, IL. 281p.
Mohlenbrock R. H. 2003. Vascular Flora of Illinois. Vascular Flora of Illinois, 3rd edition. Southern Illinois University Press, Carbondale, Illinois. 1–736.
National Cooperative Soil Survey (NCSS). 2018 (Date accessed). National Cooperative Soil Characterization Database. https://ncsslabdatamart.sc.egov.usda.gov/.
National Oceanic and Atmospheric Administration (NOAA). 2018 (Date accessed). Climate Data 1980-2010. https://www.ncdc.noaa.gov/data-access/land-based-station-data/find-station.
NatureServe. 2018 (Date accessed). Association Detail Report: CEGL002427. http://explorer.natureserve.org.
Nelson, P. 2010. The Terrestrial Natural Communities of Missouri. Revised edition. Missouri Natural Areas Committee, Department of Natural Resources and the Department of Conservation, Jefferson City. 549p.
Pyne, S.J., P.L. Andrews, and R.D. Laven. 1996. Introduction to Wildland Fire, Second Edition. Introduction to Wildland Fire, Second Edition. John Wiley and Sons, Inc. New York, New York. 1–808.
Schwegman, J.E., G.B. Fell, M.D. Hutchinson, G. Paulson, W.M. Shephard, and J. White. 1973. The natural divisions of Illinois. Comprehensive plan for the Illinois Nature Preserve system. Part 2. Illinois Nature Preserves Commission, Rockford, IL 1–32.
. 2018 (Date accessed). Web Soil Survey (SSS NRCS WSS). https://websoilsurvey.sc.egov.usda.gov/.
SSS NRCS OSD and . 2018 (Date accessed). Official Soil Series Descriptions. https://soilseries.sc.egov.usda.gov/osdname.aspx.
Taft, J.B., M.W. Schwartz, and L.R. Philippe. 1995. Vegetation ecology of flatwoods on the Illinoian till plain. Journal of Vegetation Science 6:647–666.
United States Department of Agriculture, . 2006. Land resource regions and major land resource areas of the United States, the Caribbean, and the Pacific Basin... USDA Handbook 296 1–682.
USDA, N. 2018 (Date accessed). The PLANTS Database. http://plants.usda.gov.
Voigt J. W. and R. H. Mohlenbrock. 1964. Plant communities of southern Illinois. Plant communities of southern Illinois. Southern Illinois University Press, Carbondale 1–202.
White J. 1978. Natural Areas Inventory Technical Report. Natural Areas Inventory Technical Report: Volume I, Survey Methods and Results. Illinois Natural Areas Inventory, Department of Landscape Architecture, University of Illinois at Urbana/Champaign 1–426.
White, J. and M. Madany. 1978. Classification of natural communities in Illinois (Appendix 30). In J. White, Illinois Natural Areas Inventory Technical Report. Volume 1: Survey Methods and Results. Illinois Natural Areas Inventory, Department of Landscape Architecture, University of Illinois at Urbana/Champaign. 310–405.
Anderson, R.C. and M.R. Anderson. 1975. The presettlement vegetation of Williamson County, Illinois.. Castanea 40:345–363.
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.
Anderson R. C., J. S. Fralish, and J. M. Baskin. 2007. Presettlement forests of Illinois. G. V. Burger, J. E. Ebinger, and G. S. Wilhelm, eds., Proceedings of the Oak Woods Management Workshop 9–19.
Barrett, S.W. 1980. Indians and fire.. Western Wildlands 17–20.
Briggs, J.M., A.K. Knapp, and B.L. Brock. 2002. Expansion of woody plants in tallgrass prairie: a fifteen- year study of fire and fire-grazing interactions. The American Midland Naturalist 147:287–294.
Brinson, M.M. 1993. A hydrogeomorphic classification for wetlands.
Brugam, R.B., P.D. Kilburn, and L.L. Luecking. 2016. Pre-settlement Vegetation of Greene, Jersey and Macoupin Counties along the Prairie/Forest Border in Illinois.. Transactions of the Illinois State Academy of Science 109:9–17.
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 Coterminous United States. USDA Forest Service, General Technical Report WO-76. Washington, DC. 1–92.
Coates, D.T., K.J. Lyman, and J.E. Ebinger. 1992. Woody vegetation structure of a post oak flatwoods in Illinois.. Castanea 57:196–201.
Comer, P.J., D. Faber-Langendoen, R. Evans, S. Gawler, C. Josse, G. Kittel, S. Menard, M. Pyne, M. Reid, K. Schulz, K. Snow, and J. Teague. 2003 (Date accessed). Ecological Systems of the United States: A Working Classification of U.S. Terrestrial Systems.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deep water habitats of the United States.. U.S. Dept. of Interior, Fish & Wildlife Service, Office of Biological Services, Washington DC. FWS/OBS-79/31 1–142.
Dey, D.C. and J.M. Kabrick. 2015. Restoration of Midwestern oak woodlands and savannas.. Pages 401–428 in Restoration of Boreal and Temperate Forests, Second Edition. CRC Press, Boca Raton, Florida, USA..
Edgin, B. 1996. Barrens of pre-settlement Lawrence County, Illinois.. Pages 59–65 in Proceedings of the 15th North American Prairie Conference.
Edgin, B. and J.E. Ebinger. 1997. Barrens and the pre-settlement prairie/forest interface in Crawford County, Illinois.. Castanea 62:260–267.
Edgin, B., R. Beadles, and J.E. Ebinger. 2002. Woody Composition and Structure of Karcher's Post Oak Woods Nature Preserve, Hamilton County, Illinois.. Transactions of the Illinois State Academy of Science 95:251–259.
Edgin B., W. E. McClain, R. Gillespie, and J. E. Ebinger. 2003. Vegetation composition and structure of Eversgerd Post Oak Flatwoods, Clinton County, Illinois.. Northeast Naturalist 10:111–118.
Illinois Department of Natural Resources (IDNR). March 2018 (Date accessed). Natural Divisions - Southern Till Plain..
Irland, L.C. 2000. Ice storms and forest impacts.. The Science of the Total Environment 262:231–242.
Kilburn, P. and R.B. Brugam. 2014. Inventory of Vegetation Studies in Illinois Based on the Public Land Survey Records.. Transactions of the Illinois State Academy of Science 107:13–17.
USGS. 2009 (Date accessed). Landfire National Vegetation Dynamics Models. http://www.LANDFIRE.gov/index.php.

Other references

Relationship to other established ecological classifications:
Biophysical Setting (LANDFIRE 2009); the reference community of this ecological site is most similar to: South-Central Interior Large Floodplain (CES202.705)

National Vegetation Classification System (NatureServe 2018): the reference community of this ecological site is most similar to: Platanus occidentalis - Acer saccharinum - Juglans nigra - Ulmus rubra Floodplain Forest (CEGL007334)

Illinois Natural Areas Survey (INAS) (White 1978); the reference community of this ecological site is most similar to: INAS Community Class – Floodplain Forest; Natural community – Mesic Floodplain Forest

Contributors

Doug Wallace
Ralph Tucker
Zach Weber

Approval

Suzanne Mayne-Kinney, 5/17/2024

Acknowledgments

Contact information for primary authors: Ralph Tucker (ralph.tucker@mo.usda.gov), Soil Scientist, United States Department of Agriculture - Natural Resources Conservation Service (USDA-NRCS), Union, MO; Zach Weber (zach.weber@il.usda.gov), Soil Scientist, USDA-NRCS, Olney, IL; Douglas Wallace (doug.wallace@mo.usda.gov), Ecologist, USDA-NRCS, Columbia, MO.

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)
Contact for lead author
Date	07/21/2026
Approved by
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 F113XY920IL

Silty Floodplain Forest

Last updated: 5/17/2024 Accessed: 07/21/2026

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General information

MLRA notes

Classification relationships

Ecological site concept

Associated sites

Similar sites

Table 1. Dominant plant species

Natural Resources
Conservation Service

Last updated: 5/17/2024
Accessed: 07/21/2026