black soils: mollisols in the usa
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Black Soils: Mollisols in the USASkye Wills, 12/5/2016
Soil Color: Surface (0 cm)
Soil Color: 15cm
Soils are mapped based on the concept of soil forming factors
S = f(Cl, O, R, P, T)
US Soil Survey
Climate: precipitation
Climate: temperature
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Relief, Parent Material and TimeComplicate general climatic relationships.
University of Wisconsin – Green Bayhttps://www.uwgb.edu/dutchs/EarthSC202Notes/GLACgeog.HTM
US General Soils Map (STATSGO2)Area ha % US land
Mollisols 196,645,700 21.5
Albolls
1,531,400 0.2
Aquolls
23,374,900 2.6
Cryolls
13,613,200 1.5
Rendolls
322,300 0.04
Udolls
35,606,400 3.9
Ustolls
88,468,800 9.7
Xerolls
33,728,700 3.7
US land area 914,753,700
US Mollisols• XX,XXXX ha of Mollisols in the US• XX% used for cropland production
• ??? What proportion of US production?
• XX% used for rangeland