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| Aquatic Ecological Health Assessment of Qiantang River Basin in Zhejiang Province by Phytoplankton Index of Biotic Integrity |
| XIAO Shanshi, HAO Yabin, LIU Jindian, ZHANG Aiju, WANG Jun, LUO Wei, HE Haisheng, ZHOU Zhiming |
| Key Laboratory of Freshwater Aquaculture Genetic and Breeding of Zhejiang Province, Key Laboratory of Healthy Freshwater Aquaculture, Ministry of Agriculture and Rural Affairs, Zhejiang Research Center of East China Sea Fishery Research Institute, Zhejiang Institute of Freshwater Fisheries, Huzhou 313001, China |
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Abstract In order to learn more about the aquatic ecosystem health in Qiantang River basin in Zhejiang, phytoplankton and water quality data were collected and analyzed from 16 sites (3 reference points and 13 impaired points) for four times in May, July, September and December, 2018 by a series of methods including the distribution analysis, the Mann-Whitney nonparametric test and Spearman correlation analysis to obtain the main metrics. Finally, five main parameters (abundance of Dinophyta and Cryptophyta, relative abundance of Bacillariophyta, Centrales abundance/Pennales abundance, relative abundance of Bacillariophyta and Chlorophyta, and relative abundance of Cymbella) were screened out from 37 candidate parameters. Then a phytoplankton index of biotic integrity (P-IBI) value was obtained to evaluate the aquatic ecological health by summing up the scores of every metrics calculated by the ratio method.The results showed that 1 of the 16 sections was healthy, three were in medium health condition, 9 was fair, and three were in poor health. It can be seen that the aquatic ecosystem was relatively damaged slightly in larger area of the Qiantang River in Zhejiang province. Therefore, the treatment capacity of industrial, agricultural and domestic sewage was further improved and hydrophyte was planted for water remediation to avoid further deterioration of its water. The findings indicated that the evaluation system reflected the health status of the Qiantang River appropriately, and that the range of its application was relatively narrow due to P-IBI being greatly affected by climate and geographical region in study basin. In conclusion, different P-IBI should be established for the water area with obvious habitat differences.
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Received: 27 February 2020
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