• 标题：The Spatial Distribution Characteristics of Soil Organic Carbon and Its Effffects on Topsoil under Difffferent Karst Landforms
• 关键词：soil organic carbon (SOC); spatial heterogeneity; impact factor; effect mechanism; different karst landforms; Guizhou Province in SW China
• 作者：Xingfu Wang, Xianfei Huang, Jiwei Hu and Zhenming Zhang

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Karst landforms are widely distributed in Guizhou Province, and the karst terrain is complex. To investigate the spatial distribution characteristics of soil organic carbon (SOC) in topsoil in difffferent karst landforms, a total of 920 samples were taken from difffferent karst landforms. The study areas, Puding, Xingyi, Guanling, Libo and Yinjiang in Guizhou Province, represent the karst plateau (KP), karst peak-cluster depression (KPCD), karst canyon (KC), karst virgin forest (KVF) and karst trough valley (KTV) landforms, respectively. The characteristics of the SOC contents in areas with difffferent vegetation, land use and soil types under difffferent karst landforms were analyzed. The dimensionality of the factors was reduced via principal component analysis, the relationships among SOC content and difffferent factors were subjected to redundancy analysis, and the effffects of the main impact factors on SOC were discussed. The results showed that there was a large discrepancy in the SOC contents in the topsoil layers among difffferent types of karst landforms, the changes in the SOC content in the topsoil layer were highly variable, and the discrepancy in the upper soil layer was higher than that in the lower soil layer. The SOC contents in the 0–50 cm topsoil layers in difffferent karst landforms were between 7.76 and 38.29 g·kgg1 , the SOC content gradually decreased with increasing soil depth, and the descending order of the SOC contents in difffferent karst landforms was KTV > KVF > KC > KPCD > KP