【摘要】 中小河流水电梯级开发对鱼类资源影响显著,主要表现为鱼类栖息环境的破坏。通过对广东省东江一级支流秋香江进行水生态调查与采样分析,对秋香江的鱼类资源现状进行了评估,并与历史资料进行对比研究,结果表明:由于秋香江流域水电梯级开发和其他人类活动导致鱼类缺乏合适的栖息环境,鱼类的种类和数量与历史记录相比急剧减少;鱼类种群结构较不稳定;鱼类多样性也逐渐降低。中小河流水电梯级开发应注重对整个流域进行统筹规划,保护河流水生态系统的完整性,严格要求水电站建设泄流设施并对其运行情况加强监管。更多还原

【Abstract】 The development of cascaded hydropower plants in middle and small rivers has a significant impact on fish resources,mainly includes the destruction of fish habitat.The Qiuxiangjiang River belongs to the first-class tributary of the Dongjiang River in Guangdong Province.This paper evaluates the present situation of fish resources in the Qiuxiangjiang River by aquatic ecosystem investigation and sampling analysis,and compares it with historical data.The results show that due to cascade hydropower development and other human activities in the Qiuxiangjiang River Basin,the suitable habitat for fish decreases.The species and numbers of fish decrease sharply compared with historical records.The fish population structure is relatively unstable,and the fish diversity also gradually reduces.Therefore,for the cascade hydropower development in middle and small rivers,attention should be paid to overall planning the entire river basin,protecting the integrity of the river’s aquatic ecosystem,and strictly requiring hydropower plants to build discharge facilities and strengthen supervision of their operation.更多还原