以河流景观生态格局与过程为切入点，选取其上游大坝工程设施密集、生态响应敏感的长江中游下荆江河段为实证对象，耦合RS与GIS、野外调查和室内实验分析，探究大坝下游河段对水文调节的生态响应。基于河流动力地貌、土地利用和土地覆被等因子，提出河流景观生态的分类方法和分类体系，识别河段尺度河流景观生态的关键景观要素、格局与过程，通过近15年来研究区河流景观结构、格局与过程的演进序列与水文情势的关联分析，揭示河流景观生态对水文调节的时空响应机制，综合考虑功能过程承载、生态响应的敏感性、生态过程控制和水文连接作用等景观生态特性，提出水文调节干扰下的河流景观生态安全模式。对水文调节作用下河流景观生态的时空响应机制和景观生态安全模式等关键问题开展研究，可以拓展我国河流景观生态学的研究内涵，为大型水利工程背景下长江中游河流湿地的保护与修复提供理论基础。

Focused on the fluvial landscape patterns and processes, this study explores the ecological responses of ecologically-sensitive reaches to dam-induced hydrological flow regulation by using the methods of RS and GIS, field investigation and indoor experiments and by basing on the theoretical framework of fluvial landscape ecology. The lower Jingjiang reach, at the upstream of which several large-scale dams have been constructed, is chosen as the studied example. According to the factors of hydrogeomorphic features, land cover and land use, the method for fluvial landscapes classification will be proposed. The critical elements, patterns and processes in fluvial landscapes will be identified by using the landscape metrics analysis. The evolution of the structures, patterns and processes of fluvial landscapes in the past 15 years will be discussed and associated with the flow regulation. Thereby, the spatiotemporal responses of fluvial landscapes to flow regulation will be revealed. By emphasizing on the important landscape-ecological factors including landscape diversity, ecological functions, ecological sensitivity and hydrological connectivity, the landscape-ecological security mode will be proposed. Studies on these critical problems will expand the researches of fluvial landscape ecology in China and can provide the theoretical basis for preserving and restoring the river wetlands in the middle Yangtze River, which is intensively influenced by large-scale dams.