马来眼子菜和POM稳定同位素对污染物的指示作用
Identification of Major Pollution Sources by Analysis of Stable Isotopic Shifts (δ15N and δ13C) in Potamogeton malaianus and POM
投稿时间:2018-06-28  修订日期:2019-12-26
中文关键词:马来眼子菜  颗粒有机物质  稳定同位素  太湖  污染来源
英文关键词:Potamogeton malaianus  particulate organic matter  stable isotope  Taihu Lake  pollution sources
基金项目:南京市科技计划项目(201608016);国家自然科学基金(51508263,31270409)
作者单位E-mail
张雷燕 中冶华天南京工程技术有限公司江苏 南京 210019 lyzhang27@126.com 
安 浩 中冶华天南京工程技术有限公司江苏 南京 210019南京大学 环境学院污染控制与资源化研究国家重点实验室江苏 南京 210046  
关保华 中国科学院南京地理与湖泊研究所 湖泊科学与环境国家重点实验室江苏 南京 210008  
程寒飞 中冶华天南京工程技术有限公司江苏 南京 210019  
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中文摘要:
      为了探究大型植物马来眼子菜(Potamogeton malaianus)和颗粒有机物质(Particulate organic matter,POM)对湖泊主要污染来源的指示作用,在贡湖湾选取14个样点,采集马来眼子菜和POM样品,分析其碳、氮稳定同位素的变化。结果显示,马来眼子菜和POM有相似的δ15N值趋势,都是随着离入湖口距离越远,其δ15N值逐渐增加,马来眼子菜的δ15N值为10.8‰~14.1‰,POM的δ15N值为6.69‰~14.1‰;而马来眼子菜的δ13C值随着离入湖口距离越远有下降趋势,变化范围为-17.6‰ ~ -14.5‰;POM的δ13C值则有增加趋势,变化范围为-26.9‰ ~ -24.6‰。马来眼子菜较高的δ15N值指示了人类生活污水来源的氮,表明贡湖湾的主要污染源为生活污水。相关分析表明,水中总溶解磷(TDP)与马来眼子菜的δ15N值有明显的负相关关系,水中的总氮(TN)与POM的δ15N、δ13C值则呈很好的正相关关系。而POM的N占比和底泥的δ15N值分别与POM的δ15N值有明显的正相关性。研究表明,马来眼子菜和POM的δ15N、δ13C值能够指示太湖贡湖湾的主要污染来源。
英文摘要:
      Gonghu Bay is located in the northeast of Taihu Lake. It is the channel of the water diversion project from Yangtze River to the Taihu Lake basin and is an important water source for the cities of Suzhou and Wuxi. Potamogeton malaianus is the dominant macrophyte in Gonghu Bay, with the largest distribution area and abundance, and it is sensitive to environmental change. In this study, we measured shifts in the abundance of δ15N and δ13C values in P. malaianus, particulate organic matter (POM) and sediment collected in Gonghu Bay. The shifts in isotopic abundance were analyzed to evaluate their potential for indicating the major sources of pollution to Taihu Lake. From October 2011 to April 2012, P. malaianus, POM and sediment samples were collected at 14 sampling sites in the Gonghu Bay. P. malaianus was analyzed for total nitrogen (TN), total carbon (TC), δ15N and δ13C; POM was analyzed for δ15N and δ13C; sediment was analyzed for total organic nitrogen (TON), δ15N and δ13C. There were similar trends for δ15N in P. malaianus and POM, with δ15N values increasing with sampling site distance from the inlet channel of Gonghu Bay. The ranges of δ15N for P. malaianus and POM were 10.8‰ - 14.1‰ and 6.69‰ -14.1‰, respectively. The value of δ13C for P. malaianus decreased with the distance from the diversion channel, (-17.6‰ to -14.5‰), while the δ13C value of POM tended to increase (-26.9‰ to -24.6‰). The high δ15N value for P. malaianus indicates human waste as the source, i.e., the main pollution source for Gonghu Bay is domestic sewage. Correlation analysis indicated a significant negative correlation between total dissolved phosphorus (TDP) in water and the δ15N of P. malaianus, while total nitrogen (TN) in water was positively correlated with δ15N and δ13C in POM. Further, the proportion of N in POM and the δ15 of sediment was positively correlated with the δ15N of POM. The results show that the δ15N and δ13C values of P. malaianus and POM can reliably indicate the primary pollution sources for Gonghu Bay of Taihu Lake.
张雷燕,安 浩,关保华,程寒飞.2020.马来眼子菜和POM稳定同位素对污染物的指示作用[J].水生态学杂志,41(1):79-85.
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