面源污染视角下的岩溶区地下水资源脆弱性评价——基于PSR-物元可拓模型的分析

基于PSR概念框架构建了地下水资源脆弱性评价指标体系,利用灰色关联法赋权,引入物元分析法对贵州岩溶地区地下水资源脆弱性进行评价分析。评价结果表明:1岩溶地区地下水资源的脆弱性受到自然环境尤其是降水的影响较大,农业面源的直接污染和农业生态环境的恶化是制约岩溶地区地下水资源脆弱性的主要控制因素;2近9 a来,贵州岩溶区地下水资源脆弱性的压力脆弱性处于"极度脆弱"、"中等脆弱"和"脆弱"等级,状态的脆弱等级没有变化,仍然属于"不脆弱"等级,脆弱性主要来源于压力;3总体来看,贵州岩溶地区的地下水资源脆弱性总体良好,但存在波动,干旱对岩溶地区地下水资源脆弱性的影响较大,总体关联度均小于0,存在脆弱性风险,不能盲目乐观。

Evaluation of groundwater resources vulnerability from the perspective of agricultural non-point source pollution in karst area based on PSR - matter-element extension model

Based on PSR conceptual framework, the evaluation index system of groundwater resources vulnerability is construc-ted and the groundwater resource vulnerability in karst region of Guizhou Province is evaluated using the methods of grey correla-tion weighting and the matter-element analysis. Following conclusions can be drawn:firstly, groundwater resources vulnerability in Karst region is impacted by the natural environment, especially the rainfall; the agricultural non-point source pollution and the deterioration of agricultural ecological environment are main direct controlling factors of the groundwater resources vulnerabili-ty. Secondly, for recent nine years, the stress vulnerability of groundwater resources vulnerability is at"fragile","medium frag-ile" and "fragile" levels and the state vulnerability remains at "fragile" level, which indicates that vulnerability mainly comes from stress. Thirdly, in general, the groundwater resources vulnerability in karst region of Guizhou Province is good, but fluctu-ant;the influence of drought disaster on groundwater resources vulnerability in karst region is relatively big;overall correlation is less than zero and with vulnerability risk, so optimistic opinion should not be adopted.