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《Journal of Soil and Water Conservation》 2017-02
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Spatial Heterogeneity and Distribution Characteristics of Soil Organic Carbon Density and Soil Organic Carbon Storage in a Small Karst Watershed

ZHANG Zhenming;ZHOU Yunchao;HUANG Xianfei;TIAN Xiao;Research Center of Forest Resources and Environment in Guizhou Province,Guizhou University;College of Forest,Guizhou University;Puding Karst Ecosystem Research Station,Guizhou Province;  
In order to elucidate the distribution characteristics of soil organic carbon density and the spatial distribution pattern of soil organic carbon storage in a small Karst watershed,using the combination of field sampling,laboratory determination,and Geo-statistics analysis,2 755 profiles which were investigated in detail and 23 536 soil samples were selected,the spatial heterogeneity and distribution characteristics of soil organic carbon density and soil organic carbon storage in a small Karst watershed were studied quantitatively.The results showed that the content of soil organic carbon and the average soil organic carbon density in the surface layer(0-20cm)of the watershed was 25.07g/kg and 5.23kg/m~2,respectively;the content of soil organic carbon and soil organic carbon density in the profile(0-100cm)in the watershed was 20.71g/kg and 10.21kg/m~2,respectively;the content of soil organic carbon and soil organic carbon density in two layers showed medium intensity variations.Soil organic carbon storage was 1.48×10~8kg in the first 10 cm soil layer,2.65×10~8kg in the first 20 cm soil layer,3.43×10~8kg in the first 30 cm soil layer,and 5.39×10~8kg in the 0-100 cm soil layer.The Nugget C_0 of organic carbon storage in each layer increased with the increase of soil depth,being the maximum in the 0-100 cm soil layer.The organic carbon storages of four different soil layers were low in the middle,higher in the surrounding borders,and the lowest in the south.Elevation,slope,bare rock and gravel content were the main factors affecting the spatial heterogeneity of soil organic carbon storage in the watershed.
【Fund】: 国家重大科学研究计划项目(2013CB956702);; “百”层次人才计划[黔科合人才(2015)4022号];; 贵州省基础研究项目(QKH-JZ-2014-200203)
【CateGory Index】: S153.6
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