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以重庆市北碚区5种土地利用方式为研究对象,研究了土壤剖面有机碳和有机碳密度对土地利用方式变化的响应.结果表明:(1)土壤有机碳平均含量的多少顺序表现为水田变菜地,旱地变菜地,水田变果园,水田变旱地,旱地变果园;(2)水田变旱地、旱地变为果园后有机碳含量呈降低趋势,而旱地变为菜地后有机碳含量呈增加的趋势;(3)表层(020cm)土壤有机碳密度大小顺序表现为旱地变菜地,水田变菜地,水田变果园,旱地变果园,水田变旱地;而2060cm厚度土壤有机碳密度表现为变化前为水田的土壤有机碳密度大于变化前为旱地的土壤有机碳密度.
Taking five kinds of land use patterns in Beibei District of Chongqing Municipality as research objects, the responses of soil organic carbon and organic carbon density to changes of land use patterns were studied.The results showed that: (1) The order of soil organic carbon average order was paddy field variable Vegetable field, dryland change vegetable field, paddy field variable orchard, paddy field variable dry land, dryland variable orchard; (2) After paddy field became dry land, organic carbon content of dry land into orchard decreased, but organic carbon content of dry land into vegetable land (3) The order of soil organic carbon density in surface layer (020cm) showed that the order of soil organic carbon density in dry land was changeable vegetable land, paddy field changed vegetable land, paddy field variable orchard, dryland variable fruit orchard, Before the change, the SOC of paddy field was higher than that of the dry land before the change.