岩溶碳汇效应对植被的响应研究进展

Effect of vegetation on carbon sequestration in karst systems-a critical review

植被是连接大气、水体、土壤及岩石的纽带,也是影响岩石风化碳汇效应的关键驱动因子之一。研究植被与岩石风化碳汇效应(特别是岩溶碳汇效应)的相互关系能进一步准确估算岩溶作用所产生的碳汇量并为大气CO_(2)减排研究做出重要贡献。本文阐述了植被演替对岩溶碳汇效应影响的研究进展,分析了植被对岩溶碳汇效应的控制机制,并从生物作用、土壤理化性质、气候、径流变化及岩溶地区水文地质结构等方面详细分析了植被对岩溶碳汇控制因子的影响,重点探讨岩溶作用过程中水循环响应受植被影响的情况,最后从岩溶关键带的垂向结构研究、不同降水过程中植被对流域岩溶碳库影响、结构性的小尺度与宏观尺度的水文效应耦合研究、流域尺度植被演替对岩溶碳汇的影响及对人工调控的启示4方面提出未来研究的总体趋势和方向。

Vegetation-the link between atmosphere,water,soil and rock-is a key influencing factor of carbon sequestration via rock weathering.Understanding their relationship can help to better estimate the carbon flux in karst systems and assess the effect of karsification on the reduction of atmospheric CO_(2) emissions.This review summarizes and evaluates the latest research findings on the impact of vegetation succession on karst carbon sink,the control of vegetation on the karstification process in terms of biological effects,soil properties,climate,runoff changes and hydrogeological structure of karst systems,and the impact of vegetation on water cycle during the karstification process.Finally,future research directions are proposed,which include the vertical structure of karst critical zone,the effect of vegetation on carbon sequestration in karst watershed during different precipitation processes,the relationship between microstructure and hydrological effects,and the impact of vegetation succession on carbon sequestration in karst systems at watershed scale plus insights from human interventions.