Analysis of the Characteristics of Water Ecological Environment Changes in the Yellow River Basin
The Yellow River Basin(YRB)is an important ecological barrier and water supply source for the northwest and northern regions of China.Under the dual impacts of climate change and human activities,accurately understanding the water ecological environment of the YRB can provide technical support for environmental protection and high-quality development of the YRB.This article selected 121 monito-ring sections and four indicators,including water quality,phytoplankton,plankton and benthic animals from the mainstream of the Yellow River and its major tributaries of Wuding River,Fenhe River,Weihe River and Yiluo River,to evaluate the overall water ecological environ-ment.The results show that the water quality of the mainstream of the Yellow River is good,reaching Class Ⅱ standards,while the water quality of the tributaries Wuding River,Fenhe River,Weihe River and Yiluo River generally reaches the ClassⅢstandard.The comprehen-sive water quality index method shows that all sections of the YRB have reached a good level in different seasons,and some sections have reached an excellent level.A total of 136 species belonging to 60 genera and 7 phyla of phytoplankton are detected in the mainstream and im-portant tributaries of the YRB.Compared with the 1980s and 2008,the number of species is decreased,but the biomass is increased signifi-cantly.In the past 15 years,the dominant community of phytoplankton in the mainstream and important tributaries of the Yellow River re-mains relatively stable.Four categories and 75 species of planktonic animals are detected,with rotifers(44.00%)and copepods(28.00%)being the main ones.A total of 72 species from 4 categories are detected in benthic animals,with a biomass decrease of 84.83%and 36.97%compared to the 1980s and 2008 respectively.The water quality and the status of phytoplankton,zooplankton and benthic animals in the ma-instream and major tributaries of the Yellow River exhibit significant spatiotemporal heterogeneity,and the overall ecological environment of the water is gradually improved.
water ecologywater environmentvariation characteristicsYellow River Basin
国家科技期刊平台
NSTL
万方数据
