Abstrakt
Land use management strategies have been developed to decrease the emissions of greenhouse gases to the atmosphere and to increase C stock in stable forms of soil humus. The impact of land use change and management on soil C sequestration was studied in the years 1980-1990 on grey forest soils in Pushchino, Moscow Region, Russia (54o50’ N, 37o35’ E). At present, up to 80% of grey forest soils (Humic Luvisols) are used for agriculture; these soils have been intensively used for crop production since the beginning of 19 th century. Estimates of carbon sink as net primary production and source as CO2 emission evidence the equilibration of these fluxes in most nonfertilised crops. Application of mineral fertilisers separately and in combination with low rates of organic fertilisers promoted the establishment of a mostly positive C balance in the agroecosystems studied. However, the inclusions of crops with negative C balance in crop rotations (fallow and spring cereals) led to the slow increase in stable forms, i.e. in soil humus.
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