| 水源地水库富营养化演变及防治对策—以浙江老虎潭水库为例 |
| Evolution and Control Strategies of Eutrophication in Water Source Reservoirs: A Case Study of Laohutan Reservoir in Zhejiang Province |
| 投稿时间：2023-07-11 修订日期：2024-06-22 |
| DOI：10.15928/j.1674-3075.202307110187 |
| 中文关键词:水源地水库 富营养化 长时间序列 入库支流 老虎潭水库 |
| 英文关键词:drinking water reservoir eutrophication long-term data series tributary inflows Laohutan Reservoir |
| 基金项目:国家自然科学基金（51279113）；湖北省自然科学基金（2023AFB984）。 |
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| 中文摘要: |
| 基于长期监测数据分析水库富营养化演变规律、影响因子，为制定防治对策提供依据。以浙江湖州老虎潭水库为例，收集2009—2021年历史数据，并于2022年3月—2023年2月开展为期1年的监测，分析水库及入库支流水质时空变化特征。结果表明，2009—2022年，老虎潭总体呈中营养状态，总氮长期处于IV-劣V类水平，总磷多为III类，氨氮呈显著下降趋势(P<0.01)，不同库区水质和营养状态差异较小。入库支流水质明显劣于库区，是库区氮、磷等营养盐的主要来源；支流总氮、总磷分别以劣V类和IV类为主，2014—2022年仅硝酸盐氮浓度显著下降，2022年以来支流总磷浓度有所升高。氮主要来自农业面源污染，磷的来源较为复杂。总氮、总磷、氨氮3者显著正相关，且与叶绿素a密切相关，反映了氮、磷输入促进藻类生长。老虎潭水库目前尚未见大面积藻华，但极端天气或全球变暖可能加剧其富营养化风险。建议采取控制流域面源污染、河口湿地修复、水库生态调控等措施加以防控。 |
| 英文摘要: |
| Eutrophication of drinking water reservoirs is a global environmental issue and threatens drinking water safety. Analyzing the evolution of reservoir eutrophication based on long-term data provides a basis for formulating prevention and control strategies. In this study, Laohutan Reservoir in Huzhou, Zhejiang Province was selected for case study, and we analyzed the spatiotemporal variation of water quality and associated driving factors in the reservoir and its primary tributaries. The analysis was based on historical data collected from 2009 to 2021, and monitoring conducted monthly from March 2022 to February 2023. Our primary goal was to provide scientific data for managing water quality in Laohutan Reservoir. Chlorophyll-a, total phosphorus, total nitrogen, transparency and the permanganate index were selected as eutrophication indicators. Results show that Laohutan Reservoir was in a mesotrophic state during 2009-2022. Total nitrogen (TN) met the Class IV-V surface water quality standard, total phosphorus (TP) was mainly at Class III, and ammonia nitrogen (NH3-N) decreased significantly (P<0.01). Water quality and nutrient levels varied little with location in the reservoir, while water quality in the tributaries was significantly lower and the primary source of nutrients to Laohutan Reservoir. Total nitrogen in reservoir tributaries was mostly below Class V and total phosphorus remained mostly at Class IV. From 2014 to 2022, the concentration of nitrate nitrogen decreased significantly, but total phosphorus has increased since 2022. Nitrogen in the reservoir and tributaries came primarily from agricultural non-point source pollution, while phosphorus sources were more varied. Analysis indicated that TN, TP, and NH3-N are significantly correlated and closely related to chlorophyll-a, reflecting the positive effect of nitrogen and phosphorus on algal growth. Although Laohutan Reservoir has not experienced large-scale algal blooms to date, extreme climate events and global warming increase the risk of eutrophication. Therefore, we recommend adopting the following strategies: control watershed non-point source pollution, restore estuary wetlands, and strengthen reservoir biomanipulation. This study supports water quality management in Laohutan Reservoir and also provides a valuable reference for managing other drinking water reservoirs in China. |
| 彭如初,章铭,娄静媛,李嗣新,赵文通,侯一航,胡菊香,赵先富.2024.水源地水库富营养化演变及防治对策—以浙江老虎潭水库为例[J].水生态学杂志,45(5):133-141. |
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