湘西大龙洞岩溶流域生态环境分析与治理对策

湘西岩溶区是我国西南岩溶区具有一定代表性的岩溶石山地区，其岩溶生态环境对湘西国民经济建设进程有重大影响，岩溶生态环境治理是湘西社会经济可持续发展首先要解决的问题。大龙洞岩溶台地是湘西少数民族聚居地之一，土地贫瘠，水资源开发利用困难。植被覆盖率低、地表水资源贫乏、地下水位埋深大、石漠化与水土流失等严重制约了当地的经济的发展。在研究湘西大龙洞岩溶流域自然地理与地质构造、岩溶水资源、土地与植被环境等特征的基础上，分析大龙洞岩溶流域石漠化等生态环境问题，并根据大龙洞岩溶流域生态环境特点，提出了相应的治理对策，为大龙洞岩溶流域生态环境治理提供科学依据，也为西南岩溶石山石漠化治理提供可借鉴的技术方法。

ECO-ENVIRONMENT ANALYSIS AND REHABILITATION MEASURES OF DALONGDONG CAVE KARST DRAINAGE BASIN IN WEST HUNAN

The karst area of West Hunan is a typical karst rocky mountain in Southwest China, and its ecoenvironment influences greatly the building of national economy. The chief task of maintaining sustainable development is to rehabilitate the vulnerable karst eco-environment. Dalongdong karst platform is one of the minority habitats where soil is poor and water resources are difficult to be exploited. Some facts, such as low vegetation covered rate, short surface water, deep ground water level, rocky desertification and soil erosion restrict seriously the development of local economy. By studying the characteristics of physical geography, geologic-tectonics, karst water resources, land and vegetation-environment in Dalongdong Cave karst drainage basin, the eco-environment problems, such as rocky desertification etc, are analyzed and rehabilitation measures are proposed as well in this paper.