Biological response to 5 years of operations of cascade rubber dams in a plateau urban river, China,River Research and Applications

当前位置： X-MOL 学术 › River Res. Appl. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Biological response to 5 years of operations of cascade rubber dams in a plateau urban river, China
River Research and Applications ( IF 1.7 ) Pub Date : 2020-06-30 , DOI: 10.1002/rra.3660
Xufeng Mao _{1,

2} , Xiaoyan Wei ₃ , Bernard Engel ₄ , Wenying Wang ₅ , Xin Jin _{1,

2} , Yanxiang Jin _{1,

2}

Affiliation

Aquatic ecosystem response to dam construction and operation is an important concern, but systematic assessment of impacts induced by cascade small rubber dams are seriously lacking. In this study, the Huangshui River in Qinghai Province was selected to investigate biological response to small cascade rubber dams. Two years of monitoring data in 2018 and 2019 were utilized to quantify the variation of five kinds of aquatic organisms. Results indicate continuous rubber dams produced significant changes to hydrological regimes of rivers, especially for high flow seasons, and further affect aquatic biological populations and structures of the river. (a) The biodiversity and biomass of plankton increased by 8.0 times and 1.8 times, respectively; the biomass of fish and benthic animals were enhanced by 3.2 and 2.1 times, respectively, but the species richness decreased by 30% on average. Native fish are completely replaced by exotic fish, and benthic animals are changing towards singularity; (b) The surface and bottom food chains of the river gradually become dominant, and the disappearance of native fish in the middle layer caused the exchange flow in the middle layer to decrease rapidly, which leads to a dumbbell-shaped distribution structure of biomass; (c) The regulation services of rivers have also undergone huge changes. N₂O and CH₄ emissions from dammed areas have increased by 10.1 times, and the water purification function varied in different dammed areas.

更新日期：2020-06-30

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11