| 引用本文: | 谭浪,王宗志,白莹,舒博宁,王卫光.调水前后南四湖藻密度及水环境要素变化特征.湖泊科学,2022,34(6):1802-1813. DOI:10.18307/2022.0602 |
| Tan Lang,Wang Zongzhi,Bai Ying,Shu Boning,Wang Weiguang.Variation characteristics of algae density and water environment factors in Lake Nansi before and after division of the water transfer. J. Lake Sci.2022,34(6):1802-1813. DOI:10.18307/2022.0602 |
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| 调水前后南四湖藻密度及水环境要素变化特征 |
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谭浪1,2, 王宗志1,3, 白莹1, 舒博宁4, 王卫光2
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1.南京水利科学研究院水文水资源与水利工程科学国家重点实验室, 南京 210029;2.河海大学水文水资源学院, 南京 210098;3.长江保护与绿色发展研究院, 南京 210098;4.山东省济宁市水文中心, 济宁 272004
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| 摘要: |
| 为探究大规模调水输入背景下南四湖生态环境演变特征，采用多种非参数统计方法综合分析2010—2020年南四湖藻密度、总氮（TN）、总磷（TP）、氨氮、叶绿素a（Chl.a）、五日生化需氧量（BOD5）、高锰酸盐指数（CODMn）年际年内变化规律和影响因素.结果表明：2010—2020年南四湖上、下级湖水质综合污染指数年均值范围分别为0.759~0.945、0.719~0.926，水质总体逐渐改善，但TN单项污染指数存在超标现象，主要可能与入湖河流中高浓度氮输入有关.受南水北调东线工程运行初期与严峻旱情的影响，南四湖藻密度、TP、氨氮、Chl.a在2013—2015年发生突变，随后均呈增加趋势.南水北调东线工程的运行对南四湖藻密度的年内波动影响强烈，调水工程运行后每年10月份出现峰值，其中2016年上级湖藻密度高达520.0×104 cells/L.湖区藻密度不仅与氮磷质量比（TN/TP）、TP、CODMn、Chl.a呈显著相关，还与降雨、水温密切相关.在南四湖生态环境保护治理过程中，应强化关键水质指标的污染监管与治理，完善调水方案和水生态危机应急管理办法. |
| 关键词: 水质 藻密度 趋势分析 调水工程 浅水湖泊 南四湖 |
| DOI：10.18307/2022.0602 |
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| 基金项目:江苏省“333高层次人才培养工程”科研项目（BRA2020088）和中央级公益性科研院所基本科研业务费重点项目（Y521006）联合资助. |
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| Variation characteristics of algae density and water environment factors in Lake Nansi before and after division of the water transfer |
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Tan Lang1,2, Wang Zongzhi1,3, Bai Ying1, Shu Boning4, Wang Weiguang2
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1.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, P. R. China;2.College of Hydrology and Water Resources, Hohai University, Nanjing 210098, P. R. China;3.Yangtze Institute for Conservation and Development, Nanjing 210098, P. R. China;4.Jining Municipal Hydrology Center in Shandong Province, Jining 272004, P. R. China
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| Abstract: |
| In order to explore the characteristics of the algae density and its water environment factors in Lake Nansi under the context of water transfer, non-parametric statistical methods are used to comprehensively analyze the inter-annual and intra-annual distribution trends of algae density and its key water environment factors (total nitrogen(TN), total phosphorus(TP), ammonia nitrogen, chlorophyll-a, BOD5, CODMn). The results show the annual average of comprehensive pollution index of water quality fluctuates in the range of 0.759-0.945, 0.719-0.926 in upper and lower lakes from 2010 to 2020, but the TN in Lake Nansi still exceeds the standard, which was mainly related to the high input of nitrogen into the lake. TP, ammonia nitrogen, chlorophyll-a and algae density had a sharp turning during 2013-2015 because of drought and the early operation of the South-to-North Water Transfer Project. The water quality indicators all increased afterward. The east route of the South-to-North Water Transfer Project has a strong impact on the intra-annual fluctuation of algae density. The peak value occurs in October when the algae density was 520.0×104 cells/L in upper lake in 2016. Algae density was not only significantly related to ratio of nitrogen to phosphorus, TP, CODMn, chorophyll-a, but also closely related to rainfall and water temperature. In the process of environmental protection and management of Lake Nansi, the supervision of key water quality needs to be strengthened. The management of water diversion and ecological crisis should be improved. |
| Key words: Water quality algae density trend analysis water diversion project shallow lake Lake Nansi |
