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Variations in the Silt and Clay Fractions of Loessial Soils Caused by Climatic Differences
Author(s) -
Vanderford H. B.
Publication year - 1942
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1942.036159950006000c0012x
Subject(s) - silt , soil water , agricultural experiment station , citation , hydrology (agriculture) , environmental science , agriculture , library science , archaeology , geology , geography , soil science , geotechnical engineering , computer science , geomorphology
W ITH several factors operating in soil development, the evaluation of their separate effects by observations in nature becomes very difficult. It is almost impossible to find an extensive land area in which all soil-forming factors are constant except the one under anticipated evaluation. The loess on the river bluffs of major streams in central United States represents approximately constant and youthful parent material. It is a well-mixed composite of unweathered materials generally uniform in texture throughout. The constancy of vegetation 'and topography can be secured by suitable choice of sites along the bluffs. Increases in rainfall and temperature can be provided by the north to south sequence of sites along the Missouri-Mississippi River system extending over a broad area. In the following study, the chemical differences in the silt and clay fractions of these loessial soils were used as means of showing the effects of climatic variations.