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«IZVESTIYA IRKUTSKOGO GOSUDARSTVENNOGO UNIVERSITETA». SERIYA «NAUKI O ZEMLE»
«THE BULLETIN OF IRKUTSK STATE UNIVERSITY». SERIES «EARTH SCIENCES»
ISSN 2073-3402 (Print)

List of issues > Series «Earth Sciences». 2017. Vol. 22

Soil and Ecological Zoning of the Osa River Basin Territory (the Top Angara Region)

Author(s)
D. N. Lopatina, I. A. Belozertseva
Abstract
As a result of the conducted soil and ecological researches in the territory of the Osa river basin it is revealed that the mastered part of the area near settlements has good and well fertile soils. Settlements are, as a rule, located on valleys of the rivers with initially fertile lands and besides soils are well fertilized in connection with the developed earlier cattle breeding economy. However earlier opened lands, in connection with cuttings down, the former forest grounds on watersheds are abandoned because of loss of fertility of soils now. It is established that soils of agricultural grounds are polluted by heavy metals, are grown poor by some batteries of plants. Processes of consolidation of soils, reduction of maintenance of a humus and agronomical valuable units, decrease in viability of seeds and efficiency of land mass of vegetation are observed. On deposits there is a formation of the cespitose horizon, accumulation of a humus, restoration of structure and a density reduction of soils. Soil and ecological zoning of the territory for potential development on categories of the importance and sensitivity of soils, on the basis of the made soil card, and also agrochemical indicators is carried out. About 28 % of farmlands are recommended to use, 2,6 % – to a conclusion from use as a result of their degradation with the subsequent improvement, the others to refusal of use or preservation. Mapping of change in structure of land use for the last 30 years is carried out.
Keywords
transformation, farmlands, soils, the Top Angara region, soil and ecological zoning
UDC
551.4 (571.5)
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