摘要
河流栖息地连通性对于河流水生态系统质量与稳定性至关重要,是河流生态复苏与健康保障的关键,如何量化坝址对于河流栖息地连通性的影响对于水生态保护与修复具有重要意义。研究选取北方典型多闸坝河流北运河为研究对象,利用树状河网连通性指数(Dendritic Connectivity Index,DCI)进行流域河网内闸坝对于河流栖息地连通性影响的定量分析,经1980年、2000年、2020年3个不同时期的流域闸坝空间数量、闸坝切割河段长度及总河长及DCI值关系分析表明:3个不同时期流域闸坝数量分别为11、20、23个,DCI值分别为51.6、28.7、26.5,从1980-2020年的40 a间,闸坝数量增加了109.1%,而DCI降低了48.6%,反映出河流栖息地连通性状况在变差。研究还表明不同空间位置的闸坝对河流栖息地连通性的影响特征存在差异,表现为位于干流的闸坝比支流的更影响河流栖息地连通性,模拟计算显示北运河干流闸坝影响河流栖息地连通性的平均程度是支流的10倍左右。流域鱼类种类和数量调查也表明北运河内的闸坝数量的增加对河流栖息地连通性产生较为明显不利影响。通过提高闸坝DCI值实现流域河流栖息地连通性保障的分析,对于多闸坝河流生态复苏及保护修复具有一定指导意义。
River habitat connectivity is very important for the quality and stability of river water ecosystem,and is the key to river ecological recovery and health protection.How to quantify the impact of the dam site on river habitat connectivity is of great significance for water ecological protection and restoration.In this study,North Canal River,a typical multi-dam river in northern China,is selected as the research object,and the influence of dams on river habitat connectivity is quantitatively analyzed by Dendritic Connectivity Index(DCI).The relationship between the number of dam space,the length of dam cut section,the length of total river length and DCI value in the basin in 1980,2000 and 2020 shows that the number of dams in different periods was 11,20 and 23,with DCI values of 51.6,28.7 and 26.5,respectively.During the 40 years from 1980 to 2020,the number of dams increased by 109.1%,while DCI decreased by 48.6%,reflecting the deterioration of river habitat connectivity.The results also show that the impacts of dams in different spatial locations on river habitat connectivity are different,which shows that the dams in the main stream have more impact on river habitat connectivity than those in tributaries.The simulation results show that the average impact of dams in the main stream of the North Canal River is about 10 times that of the tributaries.The fish species and quantity survey also show that the increase in the number of dams in the North Canal River has a significant negative impact on the river habitat connectivity.In this paper,the analysis of habitat connectivity guarantee of river basin by increasing the DCI value of dam has certain guiding significance for ecological recovery,protection and restoration of multi-dam rivers.
作者
谭羿鍼
王世岩
韩祯
汪洁
姜志
阳星
李步东
赵仕霖
TAN Yi-qian;WANG Shi-yan;HAN Zhen;WANG Jie;JIANG Zhi;YANG Xing;LI Bu-dong;ZHAO Shi-lin(State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin,Beijing 100038,China;Department of Water Ecology and Environment,China Institute of Water Resources and Hydropower Research,Beijing 100038,China)
出处
《中国农村水利水电》
北大核心
2023年第7期111-116,123,共7页
China Rural Water and Hydropower
基金
国家水体污染控制与治理科技重大专项(2018ZX0711103)
流域水循环模拟与调控国家重点实验室基金项目(WE1203B082022)。
关键词
河流栖息地连通性
闸坝
树状河网连通性指数
北运河
river habitat connectivity
dams and sluice gates
dendritic connectivity index
North Canal River
