广西漓江属珠江水系，全长214km，因风景秀美，水质清澈而闻名世界。季节性缺水等原因导致漓江生态环境面临严重的威胁，漓江生态系统保护与修复被水利部列为全国第一批试点单位，保证漓江不断流、水质不超标、生物多样性和生物栖息地得到恢复是亟待解决的重要课题。传统的河流健康评价主要从水质理化指标上去衡量，但是即使水质达标，也并不意味着河流健康。目前国内外更多学者认为，生物物种和生态系统完整性才是河流健康并可持续的根本要素。本项目主要基于生物完整性（IBI）评价河流生态系统健康的原理，研究鱼类群落结构的时空变化格局及其与环境因子的关系，并通过指标筛选建立适合漓江的鱼类生物完整性（FIBI）评价指标体系；在此基础上，比较上游四个水利工程建设前后的鱼类资源及其多样性变化，并对河流健康进行评价。项目将为河流健康评价及鱼类多样性保护提供科学依据，并为漓江流域的资源管理、综合开发利用及水环境保护提供理论支持。

Lijiang River in the Guangxi Province which inflows into the Pearl River, is known around the world due to its beautiful scenery and clean water, and its total length is 214 km. The ecological environment is threatened by numerous threats such as seasonal lack of water. Thus, the conservation and restoration for ecosystem of Lijiang River was listed as the first pilot scheme by the Ministry of Water Resources of the People's Republic of China, which aim to protect continuous flow and water satisfied for water standards in the Lijiang River, and to recover biodiversity and habitat of Lijiang River. Traditional assessment of river's health is mainly from its physical and chemical index of water, however, even if water quality is satisfied for water standards, it does not mean that the river is healthy. More and more scholars believe that integrity of ecosystem and biological species is the fundamental elements for river's health and its sustainable development. Therefore, temporal and spatial variation of fish communities and their association to environmental variables will be studied in this project, and index of biological integrity based on fish will be established by means of index selection based on the theory of river's health assessed by index of biological integrity (IBI), which is applicable to Lijiang River. Based on this, variations of fish resources and diversity before and after the construction of four water conservancy projects will be compared, and river's health will be assessed. Implementation of this project could provide scientific evidences for assessment of river's health and conservation of fish diversity, and provide theoretical guidance for watershed management, comprehensive exploitation and utilization of resources, and conservation of aquatic environment in the Lijiang River.