黄土丘陵区小流域表层土壤的有机碳密度及其空间分布

通过野外调查和室内分析,采用多元线性逐步回归和地理信息系统(GIS)相结合的方法,研究了黄土丘陵区燕沟流域表层(0~20 cm)土壤的有机碳密度、空间分布及其与土地利用类型和地形因子等的关系。结果表明,流域表层土壤有机碳密度平均为1.72 kg/m2,变幅为0.97~2.93 kg/m2;土地利用类型是影响土壤有机碳密度变化的首要因子;流域土壤有机碳密度呈镶嵌的树枝状和条带状空间分布格局,其高值斑块区与乔木林地和灌木林地的分布一致,中值斑块区与草地和川坝地的分布一致,低值斑块区与梯田、果园、坡耕地、疏林地和未成林地的分布一致。流域表层土壤有机碳总储量为76.81×103t。

Based on field survey and laboratory analysis,by using multi-linear stepwise regression and geographic information system(GIS),the paper studied the spatial distribution of surface soil(0-20 cm),organic C density in the Yangou watershed of loess hilly-gully region and its relationships with land use,landform,and so on.The results showed that the surface soil organic C density ranged from 0.97~2.93 kg/m2,with an average about 1.72 kg/m2 in the watershed;the most important influential factor of soil organic C...