土壤碳库管理指数(CPMI)是监测土壤有机碳(SOC)变化的敏感指标,可以直接地反映外界因素对土壤质量的影响程度,为科学评价森林土壤碳库质量提供量化依据。选取安徽皇藏峪自然保护区典型森林土壤为研究对象,对其SOC、活性有机碳(ASOC)和碳库管理指数(CPMI)的变化特征进行研究。结果表明:1)除坡裸地外,不同森林类型下SOC含量为9.93~19.15 g/kg,ASOC含量为0.73~1.36 g/kg,栓皮栎、侧柏林下SOC,ASOC含量均大于其他森林类型;2)不同森林类型下SOC表聚现象明显,随着土层深度的增加,SOC,ASOC含量均表现为下降趋势,SOC含量下降的幅度明显大于ASOC;3)表征森林土壤碳库特征的SOC,ASOC含量以及CPMI均受森林类型和土层深度的影响,不同森林类型有较高的固碳潜力,对该土壤CPMI的提高均有不同程度的促进作用。

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.