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Investigation on lake eutrophication response to pesticide and fertilizer application in the seasonal freeze region |
LOU Yu-qi, BIAN Jian-min, SUN Xiao-qing, WANG Yu, WANG Fan, LI Mu-rong |
Key Laboratory of Groundwater Resources and Environment Ministry of Education, College of Environment and Resources, Jilin University, Changchun 130021, China |
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Abstract To investigate the eutrophication and driving factors of lakes in the frozen region of northern China, the study takes Lake Chagan in western Jilin Province as the research object. Based on monitoring data, the Back Propagation (BP) neural network has been systematically applied to evaluate the eutrophication of lake and the excess nutrient indicators have been identified to analyze their dynamic characteristics. After that, the EQC model has been used to simulate the influence of water from pesticide and fertilizer residues in irrigation drainage and explore the drivers of the lake eutrophication. The results showed that: During 2016~2019, the lake was generally mildly eutrophic, with the main excess nutrient indicators being CODMn, CODCr, TP and TN, etc. The concentration of CODMn, CODCr and TP were driven by low temperatures and showed an increasing trend during the freezing period, among them, the concentration of TP increased 10%, approximately. Meanwhile, the concentration of TP and TN, were driven by irrigation and drainage that showed an upward trend during the receding irrigation period. Through EQC simulation, the contribution values of TN and TP concentrations of irrigation area drainage into the lake were obtained as 2.717mg/L and 0.080mg/L, respectively. The residual pesticide and fertilizer from the irrigation drainage were the main factors driving the increase of the TN content in the lake during the receding period, with a maximum rise of 27%. Low temperatures were the main driver of the increase of the TP content in the lake during the freeze-up period (maximum increase of about 10%). Meanwhile, the application of pesticides and fertilizers in spring has led to a trend of increased eutrophication in the lakes of the seasonal freeze region during the winter and summer. In conclusion, the management of lake eutrophication still needs to focus on reducing exogenous pollution, especially fertilizer pollution, during the receding period of the irrigation area.
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Received: 07 November 2022
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