Abstract:

As a sensitive parameter to monitor the change of soil organic carbon (SOC),soil carbon pool management index (CPMI) can directly reflect the influence of external factors on soil quality and provide quantitative basis for scientific evaluation of forest soil carbon pool quality.In this paper,changes of SOC,active organic carbon (ASOC) and carbon pool management index (CPMI) of typical forest soils in Huangcang Valley Nature Reserve are studied.The results show that:1) the SOC content of various forest lands is 9.93~19.15 g/kg,the ASOC content is 0.73~1.36 g/kg except the slope bare land.The SOC and ASOC content of Quercus variabilis and Platycladus orientalis were higher than other forest types.2) With the increase of soil depth,the SOC and ASOC content decreased,and the decrease of SOC content is larger than that of ASOC.3) The contents of SOC,ASOC and CPMI are affected by forest types and soil depth.All forest types have high carbon sequestration potential and can improve their soil CPMI in varying degrees.

Key words: forest type, soil organic carbon, soil carbon pool activity, carbon pool management index (CPMI), Huangcang Valley Nature Reserve