Macrobenthos community structure and water quality evaluation in Gansu section of Yellow River Basin
Received date: 2022-10-01
Revised date: 2023-03-14
Online published: 2023-08-14
To explore the impact of human activities on the aquatic ecosystem in the upper reaches of the Yellow River, the species composition, inhabit density, biomass, dominant species and the aquatic physiochemical parameters were investigated in August 2021 of the Gansu section of the Yellow River. A total of 32 macrozoobenthos species including 25 species of arthropods (78.13%), 5 species of mollusks (15.63%) and 2 species of annelids (6.25%) were identified. The dominant species were Sigara substriata, Ampumixis sp., Palaemon modestus, Gammarus sp., Radix Auricularia and Radix ovata in the whole study area. An obvious spatial heterogeneity in existing stock, with the values the density and biomass to be 271 ind.·m2 and 18.0105 g·m2 in the downstream section, and 95 ind.·m2 and 4.1275 g·m2 in the upstream section, respectively. The Shannon-Wiener diversity index and Margalef richness index were showed the downstream section greater than the upstream section, but the Pielou evenness index have little change along the way. The water quality was observed better in the upstream section sites than in the downstream section sites based on the evaluation results of integrated biological index and comprehensive pollution index, and the best water quality site is Y6. The water quality of Gansu section of the Yellow River generally reaches the limit of Class II surface water, the water quality of rivers is significantly improved after being purified by reservoirs and wetlands. According to the correlation matrix analysis between macrozoobenthos and environmental factors and RDA analysis, altitude and potassium permanganate are the key environmental factors affecting the benthos community structure in Gansu section of the Yellow River. Comprehensive macrozoobenthos community structure and water quality analysis, it shows that the water environment in the reservoir area and wetland is the best water. The water quality in the upstream natural reach is better than that in the downstream natural reach, but the biodiversity and abundance in the downstream reach are higher than that in the upstream reach.
Yu Wang , Xu Wang , Qi Feng , Wei Liu , Yuhua He , Jiale Zhu , Yupeng Wang . Macrobenthos community structure and water quality evaluation in Gansu section of Yellow River Basin[J]. Journal of Desert Research, 2023 , 43(4) : 146 -156 . DOI: 10.7522/j.issn.1000-694X.2023.00024
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