Northern Prairie Wildlife Research Center
|46h. Northern Dark Brown Prairie||Level IV Ecoregion|
|The Northern Glaciated Plains
ecoregion is characterized by a flat to gently rolling landscape
composed of glacial drift. The subhumid conditions foster a grassland
transitional between the tall and shortgrass prairie. High concentrations
of temporary and seasonal wetlands create favorable conditions for duck
nesting and migration. Though the till soil is very fertile, agricultural
success is subject to annual climatic fluctuations.
The Souris and Des Lacs Rivers generally divide the Northern Dark Brown Prairie from the Northern Black Prairie (46g). These ecoregions differ in precipitation, soil, and vegetation characteristics. The Souris River is within the broad transitional zone between subhumid and semiarid climatic conditions. Soils west of the Souris River developed under drier conditions than those soils further east; they have less organic material which gives them a lighter color. In addition, crop and native grass production is generally lower than in ecoregions further east.
Area (square miles): 1114
Surficial Material and Bedrock
Order (Great Groups)
Precipitation - Mean annual (inches)
Potential Natural Vegetation
Western wheatgrass, green needlegrass, little bluestem and needleandthread. Aspen and green ash in drainages.
Land Use and Land Cover
Extensively tilled to durum and spring wheat, other small grains, sunflower and alfalfa. Saline areas used for range or wildlife.