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In order to elucidate the principles determining plant residue decomposition and humus accumulation in soil, we attempted to make a simple model of soil organic matter accumulation. In this model, soil organic matter accumulation was related to the decomposition rate and annual plant production, both of which were treated as functions of annual temperature. Results of calculations showed tendencies in soil organic matter distribution along a temperature gradient, though the effects of soil factors were considered to be highly significant.

Soil Humus Distribution as Affected by Climatic and Pedological Conditions