2014-2019年焦岗湖水质时空变化与影响因子分析

doi:10.19741/j.issn.1673-4831.2021.0544

Abstract

Abstract: Jiaogang Lake is a significant shallow lake in Huaihe River Basin and the largest ecological wetland in the middle reaches of Huaihe River. Based on the monthly water quality monitoring data of Jiaogang Lake from 2014 to 2019 and four inflow rivers from 2017 to 2019, the spatial and temporal variation of water quality in Jiaogang Lake was analyzed. By using Mann-Kendall trend test, Principal Component Analysis and Correlation Analysis, the effects of inflow rivers and environmental factors on water quality and eutrophication status of Jiaogang Lake are discussed. The results show that: (1) From 2014 to 2019, Jiaogang Lake belongs to the category Ⅲ to Ⅴ of Surface Water Environmental Quality Standard of China (GB 3838-2002). The eutrophication status was between mesotrophic and mild eutrophication. The main contaminated areas were in the northwest and north of the lake area. The concentration of COD_Mn showed a slight downward trend, while the annual average concentrations of TP (and TN were relatively stable and at a high level, mainly due to aquaculture. (2) In the lake area, the external input of nitrogen, phosphorus and other pollutants from inflow rivers is the key factorleading to the concentration of pollutants exceeding the Ⅳ standard of GB 3838-2002. (3) Principal Component Analysis and Correlation Analysis show that precipitation, temperature and depth of lake had great impacts on water quality of the lake area. Rainfall increased exogenous input, high temperature caused algal bloom, but the increase of depth improved the water quality. The key to improve the water quality of Jiaogang Lake is to adjust the structure of aquaculture industry and reduce the external input of pollutants.

Key words: Jiaogang Lake, water quality, spatio-temporal change, inflow rivers, impact factor

CLC Number:

X524
X824

GAO Yue-xiang, YAN Ruo-meng, ZHANG Yi-min, PENG Fu-quan, YANG Fei, KONG Ming, LAI Qiu-ying, ZHU Yue-ming, ZHANG Zhi-wei, CHEN Ting, ZHANG Tao. Temporal and Spatial Variation and Influencing Factors of Jiaogang Lake Water Quality from 2014 to 2019[J]. Journal of Ecology and Rural Environment, 2022, 38(12): 1567-1575.

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Temporal and Spatial Variation and Influencing Factors of Jiaogang Lake Water Quality from 2014 to 2019

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