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长三角一体化示范区青浦区水体表层沉积物有机质分布特征、来源解析及污染评价
摘要点击 506  全文点击 99  投稿时间:2021-07-21  修订日期:2021-10-31
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中文关键词  长三角一体化示范区  沉积物  有机质  碳氮同位素  来源解析  污染评价
英文关键词  Yangtze River Delta integration demonstration area  surface sediments  organic matter  carbon and nitrogen isotope  source analysis  pollution assessment
作者单位E-mail
张智博 上海师范大学环境与地理科学学院, 上海 200234 1048398362@qq.com 
段艳平 上海师范大学环境与地理科学学院, 上海 200234
上海长三角城市湿地生态系统国家野外科学观测研究站, 上海 200234 
duanyanping@shnu.edu.cn 
涂耀仁 上海师范大学环境与地理科学学院, 上海 200234
上海长三角城市湿地生态系统国家野外科学观测研究站, 上海 200234 
 
罗鹏程 上海师范大学环境与地理科学学院, 上海 200234  
高峻 上海师范大学环境与地理科学学院, 上海 200234
上海长三角城市湿地生态系统国家野外科学观测研究站, 上海 200234 
 
中文摘要
      采集了长三角一体化示范区青浦区25个采样点的表层沉积物,分析了样品中总有机碳(TOC)、总氮(TN)、有机碳同位素(δ13 C)和氮同位素(δ15 N),探讨了研究区域表层沉积物中有机碳的分布特征和潜在来源,并进行了有机污染指数评价.结果表明,青浦区31个采样点表层沉积物中ω(TOC)为0.21%~3.55%,平均值为1.18%;ω(TN)范围为0.02%~0.23%,平均值为0.09%;δ13 C范围为-28.04‰~-10.80‰,平均值为-22.28‰;δ15 N范围为2.28‰~11.19‰,平均值为5.76‰;且TOC含量与TN含量显著相关;来源分析表明,研究区域表层沉积物中有机质主要受土壤有机质、污水有机质和陆生植物的影响;基于IsoSource软件的贡献率计算结果表明,土壤有机质相对贡献率较高(0.3%~96.8%),且生活污水对多数采样点有机质来源均有一定的贡献;此外所选端元物质对不同土地利用类型样品中有机质来源贡献具有一定差异性;研究区域表层沉积物中有机污染评价指数范围为0.006~0.745,平均值为0.163,总体处于轻度污染状态,其中金泽水库周边地区采样点污染状况相较于其他地区较为严重,有潜在富营养化风险,需引起一定的重视.
英文摘要
      The surface sediments were collected from 25 sampling points in the Qingpu District of the Yangtze River Delta integration demonstration area, and the total organic carbon (TOC), total nitrogen (TN), organic carbon isotope (δ13C), and nitrogen isotope (δ15N) content in the samples were analyzed. The distribution characteristics and potential sources of organic matter in the surface sediments were discussed in detail, and the organic pollution index was also evaluated. The results showed that the ω(TOC) in the surface sediments of 31 sampling points in Qingpu District was 0.21%-3.55%, with an average value of 1.18%; ω(TN) ranged from 0.02% to 0.23%, with an average value of 0.09%. The δ13C ranged from -28.04‰ to -10.80 ‰, with an average of -22.28‰, and the δ15N ranged from 2.28‰ to 11.19‰, with an average of 5.76‰. The TOC content was significantly correlated with the TN content. Source analysis showed that the organic matter in the surface sediments of the study area was mainly affected by soil organic matter, sewage organic matter, and terrestrial plants. The calculation results of the contribution rate based on IsoSource software showed that the relative contribution rate of soil organic matter was relatively high (0.3%-96.8%), and domestic sewage had a certain contribution to the organic matter source of most sampling points. In addition, the selected end-member substances had certain differences in the contribution of organic matter sources in samples of different land use types. The evaluation index of organic pollution in the surface sediments of the study area ranged from 0.006-0.745, with an average value of 0.163, indicating that the organic pollution of the study area was considered lightly polluted. Among them, the pollution of sampling points around the Jinze Reservoir was more serious than that in other areas, indicating that there was a potential risk of eutrophication in this area, which requires certain attention.

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