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.

JPG - Aerial view of wetlands in a field

On the drift plains (46g, 46i, and 46n), cultivation occurs around or through the numerous temporary and seasonal wetlands.

The boundary between the James River Lowland and the Drift Plains (46i) to the north represents a broad phenological and climatic transition zone. This ecoregion is characterized by mesic soils, warmer temperatures, and a longer growing season than the Drift Plains (46i). These differences are reflected in the crop types of the region. Winter wheat, corn, and soybeans are more prevalent in this ecoregion's milder climate.

Physiography

Area (square miles): 9227
Elevation/Local Relief (feet): 1200-1850/10-150
Glaciated. Level to slightly rolling plain composed of glacial drift. Dense concentrations of temporary and seasonal wetlands.

Geology

Surficial Material and Bedrock
Glacial till over Cretaceous Pierre Shale and sandstone of Niobrara Formation.

Soil

Order (Great Groups)
Mollisols (Argiustolls, Haplustolls, Natrustolls)
Common Soil Series
Beadle, Dudley, Hand, Bonilla, Houdek, Prosper
Temperature/Moisture Regimes
Mesic

Climate

Precipitation - Mean annual (inches)
18-20
Frost Free - Mean annual (days)
115-140
Mean Temp. - Jan. min/max; July min/max, (°F)
1/22;60/87

Potential Natural Vegetation

Western wheatgrass, green needlegrass, big bluestem, blue grama.

Land Use and Land Cover

Extensively tilled for spring wheat, sunflowers, corn, and soybeans.

Ecoregions of North Dakota and South Dakota

Ecoregions of
North Dakota
and
South Dakota