| 引用本文: | 林琳,吴敬禄,曾海鳌,刘文.人类活动对太湖水环境影响的稳定氮同位素示踪.湖泊科学,2012,24(4):546-552. DOI:10.18307/2012.0407 |
| LIN Lin,WU Jinglu,ZENG Hai'ao,LIU Wen.Stable nitrogen isotope tracing anthropogenic influence on Lake Taihu. J. Lake Sci.2012,24(4):546-552. DOI:10.18307/2012.0407 |
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| 摘要: |
| 人类活动对湖泊环境变化的影响是目前全球变化研究的热点之一.识别水体中人为氮源的贡献对于研究人类活动对湖泊环境变化的影响十分重要.稳定氮同位素组成(δ15N)是水环境中人为氮源的有效示踪剂.太湖是我国典型的大型浅水富营养湖泊,位于人口稠密、经济发达的长江三角洲地区,是研究人类活动对水环境影响的理想对象.太湖水体δ15N值的空间分异规律大致反映了不同湖区人类活动影响水环境的方式,上游宜兴小流域及河口主要受农业活动影响,胥口湾和东太湖则主要是水产养殖的贡献,梅梁湾受城市生活污水影响较大.而且水体δ15N值的水平反映了人类活动的影响从南部湖区到北部湖区逐渐加强的趋势,表现为南部河口-东太湖-梅梁湾不同水体从草型水体到藻型水体δ15N值增加的趋势.另外,夏季(6月)太湖水体δ15N值的变化响应于初级生产力的变化,体现了生物作用的影响.在蓝藻水华暴发时期,利用水体δ15N值识别人为氮源的结果可能会受到生物过程的干扰. |
| 关键词: 稳定氮同位素 人类活动 太湖 河流氮输入 |
| DOI：10.18307/2012.0407 |
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| 基金项目:国家重点基础研究发展计划"973"项目(2008CB418005);国家自然科学基金项目(41073010,40673015)联合资助 |
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| Stable nitrogen isotope tracing anthropogenic influence on Lake Taihu |
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LIN Lin1,2, WU Jinglu3, ZENG Hai'ao3, LIU Wen3
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1.Water Research Institute of Shandong Province, Ji'nan 250013, P. R. China;2.Shandong Provincial Key Laboratory of Water Resources and Water Environment, Ji'nan 250013, P. R. China;3.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
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| Abstract: |
| Anthropogenic influence on lake environmental change is one of the focus of global change research. It is necessary to identify anthropogenic sources of nitrogen in rivers and lakes. Stable nitrogen isotope ratios (δ15N) have been widely used in tracer studies of anthropogenic nitrogen sources in aquatic environments. Lake Taihu is a large, eutrophic, shallow freshwater lake in China, and is located in the Yangtze delta with high population density and economic development. It serves as an ideal site for examining human impacts on aquatic environment in China. Results of δ15N values measured in inorganic nitrogen fractions (INF) showed that a small river basin and its estuary in Yixing city were characterized by agricultural origin, while INF in Xukou Bay and East Taihu Bay by aquiculture, and INF in Meiliang Bay by discharge of human sewage. δ15N values in the macrophyte-dominated zones were much lower than those in the phytoplankton-dominated zones of the studied water body of southern estuary-East Taihu Bay-Meiliang Bay, indicating the progressive intensification of human pressure on the lake from south to north. However, elevated δ15N values in lake water which were consistent with high primary production in summer (June) suggested the consequence of biological processes. Using these values for tracing anthropogenic sources of nitrogen during algae blooms might be misleaded. |
| Key words: Stable nitrogen isotope human activities Lake Taihu nitrogen inputs from rivers |
