Temporal and Spatial Distribution of Soil Organic Carbon under Different Land Uses in Middle of Heihe

Temporal and spatial distribution of soil organic carbon and its mutative mechanism are researched under different land uses in middle of Heihe, based on the multi-methods of field samples gathered, laboratory analysis, GIS spatial analysis model and remote sensing. The results show that obvious pertinence and otherness exist between total soil carbon (TOC), active organic carbon (AOC), nonactive organic carbon (NOC) and different land uses. The extreme region and regional distribution of soil organic carbon have the better corresponding relation with different land uses; with the increase of the depth, spatial distribution of TOC, AOC and NOC have distinct change. AOC and NOC distribution are more veracious to reflect the affect of land use. Content of TOC, AOC and NOC have great change after land use change.