Natural Resources
Conservation Service
Ecological site F090BY005WI
Wet Sandy Lowland
Last updated: 11/16/2023
Accessed: 12/22/2024
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): 090B–Central Wisconsin Thin Loess Dissected Till Plain
The Wisconsin and Minnesota Thin Loess MLRA, Northern and Southern Parts (90A and 90B) correspond closely to the North Central Forest and the Forest Transition Ecological Landscapes, respectively. Some of the following brief overview is borrowed from the Wisconsin Department of Natural Resources ecological landscape publications (2015).
The Wisconsin and Minnesota Thin Loess MLRA, Northern and Southern Parts (90A and 90B) is an extensive glacial landscape that comprised of over 11.1 million acres (17,370 sq mi) throughout central and northern Wisconsin – about 27% of the total land area in the state. This glacial landscape is comprised of a heterogenous mix of loess-capped ground moraines, end moraines with eskers and ice-walled lake plains, and pitted, unpitted, and collapsed outwash plains sometimes interspersed with drumlins from the Illinoian and Pre-Illinoian glaciations. The entire area has been glaciated and nearly all of it is underlain by dense glacial till that impedes drainage. An extensive morainal system – the Perkinstown end moraine – spans most of the width of northern Wisconsin and divides the Northern and Southern Parts of this large landscape. This moraine, which has been sliced by outwash in many places, marks the southernmost extent of the Wisconsin glaciation (Wisconsin’s most recent glacial advance).
North of the Perkinstown morainal system is a loess plain, with a loess mantle 6 to 24 inches thick. The northernmost edge of this landscape is an undulating till and outwash plain with materials deposited by the Chippewa Lobe. Drumlins are common in the northern and northeastern portions. The drumlins are oriented towards the southwest and formed during a glacial episode prior to the most recent glacial advance. Some are covered with glacial till. Pitted, unpitted, and collapsed outwash plains fill the spaces between drumlins. Detached from the major land mass to the northeast is the hummocky Hayward collapsed end moraines, where swamps, ice-walled lake plains, and eskers are common.
Most of the MLRA to the south of the Perkinstown morainal system is an extensive ground moraine with some proglacial stream features including pitted outwash plains, terraces, and fans. A layer of loess 6 to 47 inches thick covers much of the area. Like the Northern Part, all areas of the Southern Part of this MLRA were glaciated, although the southcentral portion is a relatively older till plain with materials from the Illinoian and pre-Illinoian glaciations, not the most recent Wisconsin glaciation. The landforms in the southcentral portion are highly variable. Much of the area topography is controlled by underlying bedrock. Sandstone outcrops and pediments can be found here. Some of the most southern portions of the MLRA are mixed glacial deposits and residuum.
The land surface of the southeastern portion was formed by many small glacial advances and retreats. Morainal ridges protrude through an erosional, pitted outwash-mantled surface. These parallel ridges run in a northeast to southwest orientation and are dissected by many steams.
The continental climate of this MLRA is typical of northcentral Wisconsin, with cold winters and warm summers. The southern boundary of this MLRA straddles Wisconsin’s Tension Zone, a zone of transition between Wisconsin’s northern and southern ecological landscapes. Historically, the mesic forests were dominated by eastern hemlock (Tsuga canadensis), sugar maple (Acer saccharum), and yellow birch (Betula alleghaniensis).
Classification relationships
Major Land Resource Area (MLRA): Wisconsin and Minnesota This Loess and Till (Northern and Southern Parts - 90A and 90B)
USFS Subregions: Rib Mountain Rolling Ridges (212Qd), Green Bay Lobe Stagnation Moraine (212Ta), Brule and Paint Rivers Drumlinized Ground Moraine (212Xc), St. Croix Moraine (212Qa), Glidden Loamy Drift Plain (212Xa)
Small sections occur in Central-Northwest Wisconsin Loess Plains (212Xd) and Rosemont Baldwin Plains and Moraines (222Md)
Wisconsin DNR Ecological Landscapes: Forest Transition, North Central Forest
Ecological site concept
The Wet Sandy Lowland ecological site occurs primarily in the southeast portion of MLRA 90A and 90B in depressions and drainageways on outwash plains, floodplains, and stream terraces. These sites are characterized by very deep, very poorly or poorly drained soils that formed in sandy outwash, lacustrine, or alluvium deposits. Sites are subject to frequent ponding or flooding during the spring and fall. Soils remain saturated for long periods during the growing season and meet hydric soil requirements. Precipitation, runoff from adjacent uplands, groundwater discharge, and stream inflow are the primary sources of water. Soils range from extremely acid to neutral.
Wet Sandy Lowland are differentiated from other ecological sites by its deep sandy deposits and very poorly or poorly drained soils. Other very poorly or poorly drained sites have loamy or clayey deposits. These sites have lower pH and available water capacity than their loamy and clayey counterparts, which can limit vegetative growth. The poor drainage of this site distinguishes it from other sandy sites.
Associated sites
F090BY001WI |
Poor Fen Poor Fen sites consist of deep herbaceous organic materials. Some sites have mineral soil contact. They are very poorly drained and remain saturated throughout the year. They are strongly to extremely acidic. These sites are permanently saturated wetlands. They are wetter and occur lower on the drainage sequence than Wet Sandy Lowland. |
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F090BY009WI |
Moist Sandy Upland Moist Sandy Lowland sites primarily consist of deep, sandy deposits from outwash, alluvium, lacustrine, and till. They sandy deposits may have a loamy mantle or be underlain by loamy deposits. The finer materials can cause episaturation and allow the site to remain moist for some of the growing season. They are somewhat drier and occur higher on the drainage sequence than Wet Sandy Lowland. |
F090BY013WI |
Sandy Upland Sandy Upland sites consist of deep sandy and loamy deposits of outwash, alluvium, till, and residuum. Soils are primarily sand and loamy sand and have a seasonally high water table within two meters, though they don't remain saturated for extended periods. They are drier and occur higher on the drainage sequence than Wet Sandy Lowland. |
F090BY019WI |
Dry Sandy Upland Dry Sandy Upland sites consist of primarily sandy deposits of various origin. Loamy deposits are also present in many soils. They may have a seasonally high water table within two meters of the surface, though they do not remain saturated for sustained periods. They are much drier and occur higher on the drainage sequence than Wet Sandy Lowland. |
Similar sites
F090BY003WI |
Sandy Floodplain Sandy Floodplain sites are found exclusively on floodplains in sandy and sometimes silty alluvium. These sites are somewhat poorly to poorly drained and are subject to flooding. Some sites may be saturated for long enough for hydric conditions to occur. These sites are found on different landforms, but they share their particle size class and drainage capability. Sandy Floodplains can support similar vegetative communities as Wet Sandy Lowlands. |
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F090BY006WI |
Wet Loamy Lowland Wet Loamy Lowland sites consist primarily of deep loamy deposits derived from a mixture of outwash, alluvium, loess, and lacustrine sources. Some sites may have bedrock contact within two meters of the surface. These sites are seasonally ponded depressions that remain saturated for sustained periods, allowing hydric conditions to occur. They are found in similar landforms as Wet Sandy Lowlands and have similar drainage capabilities but with finer textures. These sites can support vegetative communities with higher nutrient demand. |
F090BY009WI |
Moist Sandy Upland Moist Sandy Lowland sites primarily consist of deep, sandy deposits from outwash, alluvium, lacustrine, and till. They sandy deposits may have a loamy mantle or be underlain by loamy deposits. The finer materials can cause episaturation and allow the site to remain moist for some of the growing season, though they are not subject to ponding. The vegetative communities they support may be similar to those found on Wet Sandy Lowlands. |
Table 1. Dominant plant species
Tree |
(1) Acer rubrum |
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Shrub |
(1) Cornus canadensis |
Herbaceous |
(1) Osmunda cinnamomea |
Click on box and path labels to scroll to the respective text.
Ecosystem states
T1A | - | Stand replacing disturbance that includes fire. |
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T1B | - | Removal of forest cover and tilling for agricultural crop production. |
R2 | - | Deciduous forest community is slowly invaded by conifers. |
T2A | - | Removal of forest cover and tilling for agricultural crop production. |
R3A | - | Cessation of agricultural practices leads to natural reforestation, or site is replanted. |
T3B | - | Cessation of agricultural practices leads to natural reforestation, or site is replanted. |
State 1 submodel, plant communities
1.1A | - | Light to moderate intensity fires, blow-downs, ice storms. |
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1.2A | - | Disturbance-free period for 30+ years. |