Land use system in Russia has been significantly changed since 1990. More than quarter of croplands (about 34 M ha) including soils of southern regions (Chernozems. Kastanozems) was abandoned. The abandonment of cultivated lands and successive establishment of natural vegetation led to carbon (C) accumulation in soil, qualitative changes in organic C pools and microbial community. This study was aimed (1) to quantify the different C organic pools (total, labile, recalcitrant, and microbial) in the former arable Chernozems depending on the abandonment period and (2) to estimate C sequestration potential of soils after land use change from crops to natural vegetation.
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