Natural Resources
Conservation Service
Ecological site F094AB027MI
Acidic Peaty Depression
Last updated: 9/10/2024
Accessed: 07/14/2026
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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): 094A–Northern Michigan Sandy Highlands
This area is dominated by outwash plains and moraines. The terrain can be steep on the moraines and flat in the areas of outwash. Elevation ranges from 177 to 520 m (580 to 1705 ft). Local topographic relief averages 14 m and ranges up to 188 m (45 to 615 ft). This area is covered entirely by drift. Bedrock consisting of Devonian limestone and dolomite with interbedded shale, chert, and anhydrite stringers is at various depths below the surface because of the curvature of the Michigan basin. However, bedrock exposures completely absent, as the depth of glacial drift ranges from 60 to 300 m (200-1000 ft). The Au Sable, Manistee, Au Gres, and Pine Rivers are the major streams draining this MLRA, in both the Lake Michigan and Lake Huron watersheds. The Muskegon River has its headwaters in this area.
About 70 percent of this area is forested, and about 15 percent is cropland or hayland. About one-third of the area is in small, privately owned holdings, and another one-third consists of national and State forests. The forests are used mainly for timber production and recreation. Dairy and beef operations are very important enterprises in the area. Forage and feed grains for dairy cattle and other livestock are the principal crops. Wheat, oats, corn, potatoes, and hay also are grown in the area. The Huron and Manistee National Forests, Hartwick Pines State Park, Camp Grayling (Department of Defense), Pigeon River Country State Forest are among the most notable conservation lands in the area. Reaches of the Au Sable and Pine Rivers are National Wild and Scenic Rivers.
Summary of existing land use:
Upland Forest (58%)
Hardwood (41%)
Conifer (15%)
Swamps and Marshes (14%)
Developed (11%)
Agricultural (10%)
Grassland (5%)Classification relationships
According to the USFS (Bailey) system of ecoregions, the site is located mostly within 212Hg (Kirtland's Warbler High Sand Plains) and 212Hh (Gladwin Silty Lake Plain) subsections. According to the EPA (Omernik) system of ecoregions, the site is located in 50ae (Mio Plateau), 50ah (Tawas Lake Plain) and eastern 50ad (Vanderbilt Moraines) level IV ecoregions. This site is outside the environmental range of the Kotar system. This site corresponds to the Organic Wetland, ecological land type phase, 81, in the USFS Ecological Land Type system.
Ecological site concept
The central concept of Acidic Peaty Depression is lowlands on hydric organic soils with a pH less than 4.5 (dysic histosols). Site is outside the heavy snowfall belt, mostly east of Houghton Lake where fire was frequent. Vegetation is typically peat bogs.
Associated sites
F094AB026MI Mucky Depression
Similar sites
F094AA014MI Snowy Acidic Peaty Depression
Table 1. Dominant plant species
Tree (1) Larix laricina
(2) Picea marianaShrub (1) Chamaedaphne calyculata
(2) Rhododendron groenlandicumHerbaceous Not specified
Physiographic features
Site occurs in depressions on various glacial landforms, especially where fine deposits prevent groundwater movement, or in upper positions in low base deposits create an acid environment.
Table 2. Representative physiographic features
Landforms (1) Depression
Runoff class Negligible to low Elevation 581 – 1572 ft Water table depth 0 in Aspect Aspect is not a significant factor Climatic features
Mean annual temperatures are 5.7 to 7.6 °C (42 to 46 °F). The warmest six months average 14.3 to 16.1 °C (58 to 61 °F). Mean July temperatures range from 19.1 to 20.8 °C (66 to 69 °F). Mean January temperatures range from -8.2 to -6.0 °C (17 to 21 °F). The maximum monthly average daily highs are 25.9 to 27.7 °C (79 to 82 °F). The minimum monthly average daily lows are -13.2 to -10.7 °C (8 to 13 °F).Temperatures generally decrease with elevation and latitude. Mean annual precipitation ranges from 700 to 870 mm (28 to 34 in). Precipitation decreases from west to east. Average 0 °C (32 °F) frost-free season ranges from 73 to 144 days. Average -2 °C (28 °F) freeze-free season is 106 to 172 days. Mean annual snowfall ranges from 1.1 to 2.9 m (40 to 120 in). Snowfall decreases from northwest to southeast. Mean annual extreme minimum temperatures range from -33.3 to -23.1 °C (-28 to -10 °F), or hardiness zones 4a to 6a.
Table 3 Representative climatic features
Frost-free period (characteristic range) 80-110 days Freeze-free period (characteristic range) 120-150 days Precipitation total (characteristic range) 30-30 in Frost-free period (actual range) 60-130 days Freeze-free period (actual range) 120-170 days Precipitation total (actual range) 30-30 in Frost-free period (average) 100 days Freeze-free period (average) 140 days Precipitation total (average) 30 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) CROSS VILLAGE 1E [USC00201896], Harbor Springs, MI
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(2) EAST TAWAS [USC00202423], Tawas City, MI
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(3) GRAYLING [USC00203391], Grayling, MI
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(4) MIO HYDRO PLT [USC00205531], Mio, MI
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(5) VANDERBILT 11ENE [USC00208417], Vanderbilt, MI
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(6) HOUGHTON LK ROSCOMMON AP [USW00094814], Houghton Lake, MI
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(7) HALE LOUD DAM [USC00203529], Glennie, MI
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(8) WEST BRANCH 3SE [USC00208800], West Branch, MI
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(9) ALPENA WWTP [USW00014814], Alpena, MI
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(10) ALPENA CO RGNL AP [USW00094849], Alpena, MI
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(11) CHEBOYGAN [USC00201492], Cheboygan, MI
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(12) ONAWAY 4N [USC00206184], Onaway, MI
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(13) ROGERS CITY [USC00207094], Rogers City, MI
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(14) PELLSTON RGNL AP [USW00014841], Pellston, MI
">Influencing water features
Site is seasonally ponded by local mineral poor (ombrotrophic) runoff. Seasonal water table less than 25 cm in depth. Some deep peat deposits might only be a ombrotrophic lens above a minerotrophic groundwater source, but separated from it by more than 2 meters. Sphagnum maintains a low pH environment over any amount that minerals might accumulate from atmospheric or food web sources. <br />
Soil features
Soils are very poorly drained acidic peat. They are commonly classified Typic Haplosaprists, Terric Haplosaprists, and Typic Haplohemists, and commonly mapped as Loxley, Dawson, and Histosols series or components. The top 50 cm has a typical pH of 4.1 and is 10% sand and 61.4% organic matter. At depth, pH ranges up to 5.1, and texture averages 35% sand and 20% clay. Depth to impeded hydraulic conductivity or root restrictive layers averages >200 cm. Depth to carbonates averages >200 cm.
Table 4. Representative soil features
Parent material (1) Organic material
Surface texture (1) Peat
(2) Muck
Drainage class Very poorly drained Permeability class Slow to moderately rapid Soil depth 79 – 0 in Surface fragment cover <=3" Not specified Surface fragment cover >3" Not specified Available water capacity
(0-39.4in)13.78 – 21.65 in Soil reaction (1:1 water)
(0-19.7in)3.5 – 5.5 Subsurface fragment volume <=3"
(0-59.1in)Not specified Subsurface fragment volume >3"
(0-59.1in)Not specified Ecological dynamics
Acidic Peaty Depression tends to share the same ecological dynamics as Natureserve/Landfire system, Boreal-Laurentian Conifer Acid Swamp or Boreal-Laurentian Bog. Stand replacing fires occurred every 350-1400 years, with light surface fires every 60-250 years. Overstory was dominated by acid tolerant, low nutrient demanding, saturation tolerant tamarack (Larix laricina) and spruce (Picea mariana). The understory is dominated by peat moss (Sphagnum spp.) and acid tolerant dwarf evergreen shrubs like leatherleaf (Chamaedaphne calyculata) and Labrador-tea (Rhododendron groenlandicum).
State and transition model
More interactive model formats are also available. View Interactive Models
Click on state and transition labels to scroll to the respective textState 1 submodel, plant communities
State 2 submodel, plant communities
State 3 submodel, plant communities
State 4 submodel, plant communities
State 1
Reference StateCommunity 1.1
Bog Forest: Picea mariana - (Larix laricina) / Ledum groenlandicum / Sphagnum spp. Swamp ForestCommunity 1.2
Bog Meadow: Carex oligosperma - Carex pauciflora - Eriophorum vaginatum / Sphagnum spp. Acidic PeatlandCommunity 1.3
Open Bog: Chamaedaphne calyculata - Ledum groenlandicum - Kalmia polifolia BogCommunity 1.4
Emergent Marsh: Equisetum fluviatile - (Eleocharis palustris) MarshCommunity 1.5
Submergent Aquatics: Nymphaea odorata - Nuphar (microphylla, variegata) Aquatic VegetationPathway 1.1A
Community 1.1 to 1.2Fire in dry year consumes excess peat.
Pathway 1.1B
Community 1.1 to 1.3Fire/Blowdown.
Pathway 1.2A
Community 1.2 to 1.1Succession.
Pathway 1.2B
Community 1.2 to 1.3Succession, peat buildup.
Pathway 1.2D
Community 1.2 to 1.4Permanent inundation.
Pathway 1.2E
Community 1.2 to 1.5Permanent inundation.
Pathway 1.3A
Community 1.3 to 1.1Succession.
Pathway 1.3B
Community 1.3 to 1.2Fire in dry year consumes excess peat.
Pathway 1.3C
Community 1.3 to 1.4Permanent inundation.
Pathway 1.3C
Community 1.3 to 1.5Permanent inundation/bog mat sinks due to decay or is blown away by wind.
Pathway 1.4A
Community 1.4 to 1.2Drop water table.
Pathway 1.4C
Community 1.4 to 1.5Water becomes deeper.
Pathway 1.5A
Community 1.5 to 1.2Drop water table.
Pathway 1.5C
Community 1.5 to 1.4Water table drop temporarily, allowing for establishment of emergents.
State 2
Cultural StateCommunity 2.1
Sustainable Crop, Pasture, or PlantationCommunity 2.2
Unsustainable Cultural PhaseCommunity 2.3
Conservation FeatureCan be a grassed waterway, conservation reserve, a small patch pollinator garden, or other land taken out of its primary cultural production to mitigate or reduce impacts of adjacent land use, and is not by itself a permanent restoration of a complete native biological community and associated ecosystem services.
Pathway 2.1A
Community 2.1 to 2.2Revert to unsustainable cultural practices.
Pathway 2.1B
Community 2.1 to 2.3Establish conservation feature.
Conservation practices
Conservation Cover Grassed Waterway Pathway 2.2A
Community 2.2 to 2.1Implement sustainable cultural practices.
Conservation practices
Conservation Crop Rotation Cover Crop Nutrient Management Integrated Pest Management (IPM) Pathway 2.2B
Community 2.2 to 2.3Establish conservation feature.
Conservation practices
Conservation Cover Grassed Waterway Pathway 2.3A
Community 2.3 to 2.1Implement sustainable cultural practices.
Conservation practices
Conservation Crop Rotation Cover Crop Nutrient Management Integrated Pest Management (IPM) Pathway 2.3B
Community 2.3 to 2.2Revert to unsustainable cultural practices.
State 3
Seminatural Drained StateCommunity 3.1
Ruderal Drained Meadow & ShrubCommunity 3.2
Exotic Ruderal Drained ForestPathway 3.1A
Community 3.1 to 3.2Succession
Pathway 3.2A
Community 3.2 to 3.1Blowdown/clearcut.
Conservation practices
Early Successional Habitat Development/Management Forest Stand Improvement State 4
Seminatural StateCommunity 4.1
Ruderal Wet Meadow & Shrub SwampCommunity 4.2
Exotic Ruderal Swamp ForestPathway 4.1A
Community 4.1 to 4.2Succession.
Pathway 4.2A
Community 4.2 to 4.1Blowdown/clearcut.
Conservation practices
Early Successional Habitat Development/Management Forest Stand Improvement Transition T1A
State 1 to 2Drain; clear vegetation; cultivate domesticated species.
Transition T1B
State 1 to 3Drain; clear vegetation, invasive species introduced.
Transition T1C
State 1 to 4Clear vegetation, invasive species introduced.
Restoration pathway R2
State 2 to 1Restore hydrology; remove domesticated species; restore native species.
Conservation practices
Brush Management Restoration and Management of Rare and Declining Habitats Wetland Wildlife Habitat Management Wetland Restoration Herbaceous Weed Control Transition T2A
State 2 to 3Abandon, succession.
Transition T2B
State 2 to 4Restore hydrology; abandon; succession.
Conservation practices
Wetland Restoration Restoration pathway R3
State 3 to 1Restore hydrology; control invasive species; restore native species
Conservation practices
Brush Management Restoration and Management of Rare and Declining Habitats Wetland Wildlife Habitat Management Wetland Restoration Herbaceous Weed Control Transition T3A
State 3 to 2Clear vegetation; cultivate domesticated species.
Transition T3B
State 3 to 4Restore hydrology.
Conservation practices
Wetland Restoration Restoration pathway R4
State 4 to 1Control invasive species; restore native species.
Conservation practices
Brush Management Restoration and Management of Rare and Declining Habitats Wetland Wildlife Habitat Management Herbaceous Weed Control Transition T4A
State 4 to 2Drain; clear vegetation; cultivate domesticated species.
Transition T4B
State 4 to 3Drain.
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 1.3 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 8. Community 1.4 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 9. Community 1.5 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 10. Community 2.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 11. Community 2.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 12. Community 2.3 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 13. Community 3.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 14. Community 3.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 15. Community 4.1 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Table 16. Community 4.2 plant community composition
Group Common name Symbol Scientific name Annual production () Foliar cover (%) Interpretations
Supporting information
Other references
A PROVISIONAL ECOLOGICAL SITE is a conceptual grouping of soil map unit components within a major land resource area (MLRA) based on the similarities in response to management. A provisional ecological site is a first approximation based on a cursory literature review, personal experience, and limited field reconnaissance. As more adequate literature review, expert opinion, and intensive plot data are collected, the site concept is subject to shifting, broadening, narrowing, subdivision, or re-aggregation in definition. Likewise, the community dynamics will be more elaborate in content, and may also change in structure, upon reaching approved status.
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 and medium 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.
Albert, D. A. et al., 1995. Vegetation circa 1800 of Michigan. Michigan's native landscape as interpreted from the General Land Office Surveys 1816-1856 (digital map), Lansing: Michigan Natural Features Inventory.
Baker, M.E. and Barnes, B.V., 1998. Landscape ecosystem diversity of river floodplains in northwestern Lower Michigan, USA. Canadian Journal of Forest Research, 28(9), pp.1405-1418.
Barnes, B. V. and Wagner, W. H., 2004. Michigan trees: a guide to the trees of the Great Lakes region. Ann Arbor (Michigan): University of Michigan Press.
Burger, T. L. and Kotar, J., 2003. A Guide to Forest Communities and Habitat Types of Michigan. Madison, Wisconsin: Department of Forest Ecology and Management, University of Wisconsin.
Cleland, D. T. et al., 1994. Field guide: Ecological classification and inventory system of the Huron-Manistee National Forests, s.l.: USDA Forest Service, North Central Forest Experiment Station.
Eichenlaub, V.L., 1979. Weather and climate of the Great Lakes region. University of Notre Dame Press, Indiana. 335 pages.
GHCN, 2016. Global Historical Climatology Network Monthly Versions 2 and 3 (temperature and precipitation data). NOAA. https://www.ncdc.noaa.gov/ghcnm/
Kost, M. A. et al., 2010. Natural Communities of Michigan: Classification and Description, Lansing, MI: Michigan Natural Features Inventory.
Landfire, 2017. Landfire Biophysical Settings Review Site. Accessed May, 2017 http://www.landfirereview.org/descriptions.html.
National Ocean Service, 2017. Tides and Currents (historic water level data for US coastal waters). https://tidesandcurrents.noaa.gov/stations.html?type=Water+Levels
NDBC, 2017. National Data Buoy Center (wave height and period data for US coastal waters). NOAA. http://www.ndbc.noaa.gov/
PRISM Climate Group. 2013. Gridded 30 Year Normals, 1981-2010. Oregon State University, http://prism.oregonstate.edu
U.S. Department of the Interior, Geological Survey, 2011. LANDFIRE: LANDFIRE 1.1.0 Existing Vegetation Type layer. http://landfire.cr.usgs.gov/viewer/
USFS, Witness Tree data for northern Lower Michigan.
Contributors
Gregory J. Schmidt
Approval
Greg Schmidt, 9/10/2024
Acknowledgments
The following individuals made substantive comments regarding the development of the Provisional Ecological Sites: Randy Swaty, The Nature Conservancy; Trevor Hobbs, USFS; Richard A. Corner, USFS; Andy Henriksen, NRCS; Dan Zay, NRCS.
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 07/14/2026 Approved by Approval date Composition (Indicators 10 and 12) based on Annual Production Indicators
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Number and extent of rills:
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Presence of water flow patterns:
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Number and height of erosional pedestals or terracettes:
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Bare ground from Ecological Site Description or other studies (rock, litter, lichen, moss, plant canopy are not bare ground):
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Number of gullies and erosion associated with gullies:
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Extent of wind scoured, blowouts and/or depositional areas:
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Amount of litter movement (describe size and distance expected to travel):
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Soil surface (top few mm) resistance to erosion (stability values are averages - most sites will show a range of values):
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Soil surface structure and SOM content (include type of structure and A-horizon color and thickness):
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Effect of community phase composition (relative proportion of different functional groups) and spatial distribution on infiltration and runoff:
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Presence and thickness of compaction layer (usually none; describe soil profile features which may be mistaken for compaction on this site):
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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:
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Amount of plant mortality and decadence (include which functional groups are expected to show mortality or decadence):
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Average percent litter cover (%) and depth ( in):
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Expected annual annual-production (this is TOTAL above-ground annual-production, not just forage annual-production):
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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:
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Perennial plant reproductive capability:
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