Abstract: Clarifying the effects of alpine wetland degradation on soil labile organic carbon and carbon pool management index (CPMI) is of great significance for ecological restoration of degraded alpine wetlands. We collected soil samples from relatively pristine (RPM), lightly degraded (LDM), moderately degraded (MDM), heavily degraded (HDM), and severely degraded marsh (SDM) to examine the responses of the contents of soil total organic carbon (TOC), labile organic carbon fractions, and carbon pool management index (CPMI) to wetland degradation in the Zoige Wetland Nature Reserve. The results showed that soil TOC content at 0-100 cm ranked in the order of RPM>LDM>MDM>HDM>SDM. Compared with RPM, the content of water soluble organic carbon (WSOC), dissolved organic carbon (DOC), and permanganate oxidized carbon (PXOC) in soils of all degraded alpine wetlands decreased, and the contents of WSOC, DOC and PXOC in MDM, HDM and SDM significantly decreased by 25.79%-76.76%, 35.90%-92.81%, and 32.07%-80.06% respectively. The ratio of soil labile organic carbon (WSOC/TOC, DOC/TOC, and PXOC/TOC) gradually increased with the aggravation of wetland degradation, while soil CMPI gradually decreased. Therefore, alpine wetland degradation may decrease soil carbon sink capacity and soil quality by increasing the activity of soil organic carbon.

Key words: remote sensing basedecological index (RSEI), Jinjiang., index-based built-up index (IBI), remote sensing, ecology, built-up land expansion