中文摘要：

岩溶区植被是岩溶生态系统的重要组成部分，具有旱生性、喜钙性、岩生性和对环境变化敏感的特点。为了更好的恢复植被，加速岩溶生态系统的重建，在广西弄拉岩溶动力系统监测站，通过收集并分析大气降雨、土壤水和表层岩溶泉水的物理化学特征，对典型表层岩溶泉——兰电堂泉集水区内的水源林的表层水文地球化学效应进行了研究。结果表明：植被能降低大气降雨的pH值，增加大气降雨中化学物质（HCO3^-、K^＋、Na^＋、Ca^2＋、Mg^2＋和游离CO2）的总含量，尤其是游离CO2的增加能增强岩溶动力系统中的溶蚀动力，有利于岩溶作用；植被能改变土壤的理化性质。减少土壤水的含量，增加土壤的自然含水量，影响土壤水的化学性质；植被不仅通过淋溶等方式增强岩溶动力因子（H2O和CO2）来影响表层岩溶泉水的物理化学性质，还通过自身的生理作用（蒸腾和呼吸）来影响表层岩溶泉水的物理化学性质。因此岩溶区植被不但具有与非岩溶区植被同样的功能，还具有其特有的生态效应。今后岩溶植被的恢复和重建应该从提高当地居民生活质量、可持续发展和岩溶景观等角度来考虑。

英文摘要：

Vegetation is one of the important components of karst ecosystem. It is xerophile, petrophile, calciphile and sensitive to environmental change. The goal of this study is to restore karst vegetation better and to accelerate rebuilding karst ecosystem. In the karst dynamic system monitoring site of Guangxi Nongla, by collecting and analyzing water samples chemical characters, for example, the chemical characters of rainfall, soil water and epikarst spring. The paper studied the epi-hydrogeochemical effects of karst vegetation in Guangxi Nongla. The conclusions are as follows：Vegetation can acidify rainfall and increase chemical substances （HCO3^-、K^＋、Na^＋、Ca^2＋、Mg^2＋ and dissociative CO2 ） , especially the increasing of dissociative CO2 can increase karst dynamics in karst dynamic system; Vegetation can strengthen soil＇ s capability of preserving water, decrease soil water, increase soil＇ s natural water content, influence chemical characters of soil water; Vegetation can increase karst dynamic factors not only by leaching but also through its photosynthesis and transpiration, which influences physicochemical characters of epikarst spring. So karst vegetation has its distinctive ecological functions from non-karst vegetation. It is strongly recommended that, restoration and rebuilding of karst vegetation should be undertaken in consideration of improving people＇ s living level, sustainable developing and karst landscape.