后寨河流域岩溶含水层脆弱性及其对土地利用方式的响应

Vulnerability of Karst Aquifers in Houzhai River Basin and Its Relations with Landuse Change

岩溶含水层由于其本质脆弱性,对土地利用变化极其敏感,土地利用/覆被变化在很大程度上影响着地下水的水质和水量.以典型岩溶单元—贵州普定后寨河流域为例,分析了流域水文地质背景下的岩溶含水层本质脆弱性,结合流域地下河水近20年的水化学资料,分析了含水层脆弱性对土地利用变化的响应.结果显示:土地利用/覆被变化、农业活动、城镇建设及居民活动都对地下水质变化有明显影响.因此,调整土地利用结构,恢复岩溶植被,改善生态环境是保护和改善岩溶水资源的重要途径.

The karst aquifers is highly sensitive to landuse change due to its intrinsic vulnerability. The groundwater quality is affected by landuse/landcover change to a large extent. Taking the typical karst subterranean river basin _ Houzhai subterranean river basin, Puding County, Guizhou Province, as an example, the intrinsic vulnerability is analysed resulted from its hydrogeological conditions. Based on more than 20 years＇ hydrochemical data, the vulnerability of karst aquifers and its relations with landuse change, agricultural activities, urbanization and unreasonable human activities are also analysed. The results shows that the groundwater qulity is affected by the landuse change, agricultural activities and unreasonable human activities. Therefore, the unreasonable patterns of land use must be re-arranged to protect the karst water resources. It is necessary of ecological rehabilitation or reafforestation, preventing the groundwater from pollution caused by agricultural activities and unreasonable human activities in order to enhance the qulitv of groundwater.