The variation rule of soil organic carbon density in the growing process of man-made forest was studied by taking Caragana microphylla plantation in loess hilly region as the research object with field survey and laboratory analysis.The results indicated as follows: 1) Soil organic carbon are mainly distributed in the 0-20cm soil layer,which accounted for 49% to 63% of total soil organic carbon content in 0-50cm soil layer.2) Compared with the control,the soil organic carbon density of C.microphylla plantat...
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