雪被去除对亚高山森林"凋落物-土壤"剖面有机碳周转模式的影响OA北大核心CSTPCD

Climate change has led to intense alterations in winter snow cover,potentially cau-sing differentiation in the carbon turnover process of the"litter-soil"continuum along the soil pro-file.This study conducts in-situ simulation experiments in a subalpine forest of western Sichuan with snow removal treatment,monitoring and periodically sampling the organic and inorganic carbon con-tent of different soil layers to explore the regulatory mechanisms of soil carbon turnover in response to snow removal.The results indicate that snow removal exacerbates soil freeze-thaw cycles,with in-tense freezing events promoting the accumulation and carbon availability of organic carbon in litter and organic soil layers,while having insignificant effects on the mineral soil layer.Soil respiration is significantly reduced by the removal of snow cover.In the"litter-soil"continuum,snow removal increases the connectivity between various organic carbons in the mineral soil layer and the litter lay-er but diminishes the significance of the connectivity between organic carbons in the mineral soil lay-er and the organic soil layer.The loss of snow cover and intensified freeze-thaw events have a short-term positive effect on the accumulation of soil organic carbon in the subalpine forest ecosystem of western Sichuan.