基于生态保护的洞庭湖湿地生态需水量研究

On eco-environmental water requirement of wetland around Dongting Lake based on ecosystem conservation

近年来洞庭湖湿地季节性缺水、工程性缺水、水质型缺水问题日渐突出,直接威胁到洞庭湖湿地生态系统的健康.分析认为,目前洞庭湖湿地生态系统健康状态等级为中等并有向差等级演化的趋势,必须确保最小生态需水量.采用水量平衡法可以初步估算其最小生态需水量为2.68×108m3,而且将呈逐年上升的趋势.

In recent years, water shortage around Dongting Lake has been deteriorating, which is related to climatic change, Three Gorges project and water pollution. It has directly threatened the Wetland Ecosystem Health （WEH）. Therefore, it is imperative and urgent to study the Eco-environmental Water Requirement of Wetland in this area without destroying ecosystem. But now the level of WEH around Dongting Lake is becoming lower and lower. We must ensure the minimum ecological water requirement, which is 2.68×10^8m^3 based on water quantity balance model. From the perspective of conservation and long-period study, it is necessary to evaluate the superior level of ecological water requirement based on eco-hydrological model.