Natural Resources
Conservation Service
Ecological site R092XY012WI
Moist Clayey Lowlands
Last updated: 4/09/2020
Accessed: 11/21/2024
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): 092X–Superior Lake Plain
The Wisconsin portion of the Superior Lake Plain (MLRA 92) corresponds very closely to the Superior Coastal Plain Ecological Landscape published by Wisconsin Department of Natural Resources (WDNR 2015). The following brief overview of this MLRA is borrowed from that publication.
The Superior Coastal Plain is bordered on the north by Lake Superior and on the south by the Northwest Sands, Northwest Lowlands, and North Central Forest Ecological Landscapes. The total land area is approximately 1.2 million acres, which mostly consists of privately-owned forestland. The climate is strongly influenced by Lake Superior, resulting in cooler summers, warmer winters, and greater precipitation compared to more inland locations. The most extensive landform in this ecological landscape is a nearly level plain of lacustrine clays that slopes gently northward toward Lake Superior. The coastal plain is cut by deeply incised stream drainages and interrupted by the comparatively rugged Bayfield Peninsula.
During the Late Wisconsin glacial period, this area was covered with the advancing and retreating lobes of Superior and Chippewa. The landscape was rippled with moraines, but they were subdued by deposition of lacustrine materials. As the glaciers receded, glacial lakes riddled the landscape—most notably, Glacial Lake Duluth. The glacier receded eastward, exposing the western Lake Superior Basin. The ice covered the eastern basin, blocking the outlet of the lake, and continued to recede and contribute meltwaters that filled the glacial lake. The deep, red clays were deposited during this period of glacial lakes. The meltwaters from the glacier also contained sands which were deposited along the edge of the glacial lakes as beach deposits. Deep, narrow valleys have since been carved by rivers and streams flowing north into Lake Superior.
Historically, the Superior Coastal Plain was almost entirely forested. Various mixtures of eastern white pine (Pinus strobus), white spruce (Picea glauca), balsam fir (Abies balsamea), white birch (Betula papyrifera), balsam poplar (Populus balsamifera), quaking aspen (Populus tremuloides), and northern white-cedar (Thuja occidentalis) occurred on the fine-textured glacio-lacustrine deposits bordering much of the Lake Superior coast. Sandy soils, sometimes interlayered with clays, occur in some places. Such areas supported forests dominated by eastern white pine and red pine (Pinus resinosa). Eastern white pine was strongly dominant in some areas, according to mid-19th century notes left by surveyors of the federal General Land Office (Finley, R. 1976). Dry-mesic to wet-mesic northern hardwoods or hemlock-hardwood forests were prevalent on the glacial tills of the Bayfield Peninsula. Large peatlands occurred along the Lake Superior shoreline, associated with drowned river mouths.
Classification relationships
Habitat Types of N. Wisconsin (Kotar, 2002): One site in this ES keys out to Acer rubrum – Abies balsamea / Vaccinium spp. – Cornus canadensis [ArAbVCo], and one site keys out to Acer saccharum – Tsuga canadensis / Maianthemum canadense [ATM].
Biophysical Setting; Landfire (NatureServe, 2018): This is ES is mapped as Larentian – Acadian Northern Hardwoods Forest and Laurentian – Acadian Sub-boreal Mesic Balsam Fir-Spruce Forest. The ES is not well represented by any of these, but most similar to Sub-Boreal Mesic Balsam Fir - Spruce Forest.
WDNR Natural Communities (WDNR, 2015): This ES is not well represented by any of the described natural communities, but bears some resemblance to Northern Wet-Mesic Forest and Boreal Forest.
USFS Subregions: Superior-Ashland Clay Plain Subsection (212Ya); May contain small areas of Ewen Dissected Lake Plain Subsection (212Jo), Winegar Moraines Subsection (212Jc), Gogebic-Penokee Iron Range Subsection (212Jb), and NorthShore Highlands Subsection (212Lb)*
Major Land Resource Area (MLRA): Superior Lake Plain (92)
Ecological site concept
Moist Clayey Lowlands has a fairly wide extent throughout the MLRA, but most common in the Bayfield peninsula and the Apostle Islands. The sites are located on till plains and lake plains, with very fine and fine textures, sometimes with a sandy or loamy mantle over the clayey deposits. The fine materials cause a perched seasonally high water table that has a depth of 0 to 30 cm, but the water table can reach a depth of greater than 152 cm during dry periods. The primary source of water is precipitation, but runoff and groundwater also contribute. The soils range from strongly acid to strongly alkaline. Carbonates may be present beginning at 30 cm. The wide pH range is caused by soil differences—mores specifically, the soils with a sandy mantle are more acidic because of the coarse texture and lack of carbonates. This ES is wetter than Clayey Uplands, but not as wet as Wet Loamy or Clayey Lowlands. This ES differs from Moist Sandy Lowlands and Moist Loamy Lowlands based on its finer texture, clayey deposits, and its higher seasonally high water table. Typical vegetation includes balsam fir, red maple, sugar maple, paper birch, red oak, green ash, and quaking aspen. Ground flora includes ferns, beaked hazelnut, goldthread, American starflower, and Canada mayflower.
Associated sites
R092XY007WI |
Wet Loamy or Clayey Lowlands These sites are poorly to very poorly drained soils that formed in mainly clayey deposits. Some sites may have a sandy or loamy mantle overlying a clayey deposit. Soils remain saturated throughout the year and frequently experience ponding and flooding in the spring and fall. Water table rarely drops below 30cm in drought conditions. Most sites have apparent carbonates, and pH ranges from strongly acid to moderately alkaline. HGM criteria: recharge, Depressional. These sites are often adjacent to Moist Clayey Lowlands but located on a lower landscape position in the drainage sequence. |
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R092XY015WI |
Clayey Uplands These sites are deep, moderately well to well drained soils that formed in clayey till or glaciolacustrine deposits. Some sites have a sandy or loamy mantle. Sites have a seasonally high water table, but does not remain saturated for extended periods. Sites range from strongly acid to moderately alkaline, with carbonates present in many sites. These sites are often adjacent to Moist Clayey Lowlands but located on a higher landscape position in the drainage sequence. |
Similar sites
R092XY010WI |
Moist Sandy Lowlands Moist Sandy Lowlands have a sandy mantle overlying finer glaciofluvial materials. The finer materials can cause episaturation in spring and fall, allowing the site to remain moist for some of the growing season, but does not remain saturated, nor does it have hydric conditions. These sites are found in a similar landscape to Moist Clayey Lowlands but are coarser textured and in a different drainage sequence. |
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R092XY011WI |
Moist Loamy Lowlands These sites are somewhat poorly drained soils formed in various parent materials, but primarily are primarily loamy. The loamy texture causes the soil to remain moist for much of the growing season but does not remain saturated long enough to form hydric conditions. These sites are found in a similar landscape to Moist Clayey Lowlands but are coarser textured and in a different drainage sequence. |
Table 1. Dominant plant species
Tree |
(1) Acer rubrum |
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Shrub |
(1) Corylus cornuta |
Herbaceous |
(1) Pteridium aquilinum |
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. |
R3B | - | Cessation of agricultural practices leads to natural reforestation, or site is replanted. |
State 1 submodel, plant communities
1.1A | - | Blow-down, severe ice storm, or large-scale mortality in overstory. |
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1.2A | - | Advanced regeneration response to canopy disturbance. |