Trends of Changes in the Amount and Quality of Humus in the Soil of Various Links of the Near-Salair Agricultural Landscapes
A. A. Tanasienko, T. A. Gorelova, E. S. Bukhanistova
Abstract
Human impact on soils of biogeocenoses, such as black soil, leached and dark-gray forest soil, is followed by a decrease in humus level and deterioration of its quality. Annual humus mineralization in full-profile soil reaches 0,7 t/ha, while estrangement of this substance due to erosion processes varies within the range 1.4-1.8 t/ha. As a result of annual wash-out of the upper part of humus horizon and increase in arable owing to underlying soil layers, the composition of humus is transformed from humate to fulvate-humate. The effect of plough-out is more clearly pronouced under the Siberian conditions than in the similar kinds of soil in the European part of the country.
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