| 于桥水库沉积物-水界面氮磷剖面特征及交换通量 |
| |
| 引用本文： | 文帅龙,龚琬晴,吴涛,郑小兰,江雪,李鑫,钟继承.于桥水库沉积物-水界面氮磷剖面特征及交换通量[J].环境科学,2018,39(5):2154-2164. |
| |
| 作者姓名： | 文帅龙 龚琬晴 吴涛 郑小兰 江雪 李鑫 钟继承 |
| |
| 作者单位： | 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室;中国科学院大学;天津市水利科学研究院 |
| |
| 基金项目： | 国家自然科学基金项目（41371457，41771516）；国家水体污染控制与治理科技重大专项（2013ZX07113001）；天津市水务局于桥水库专项 |
| |
| 摘 要： | 于桥水库是天津市重要的饮用水源地,但近年来呈现富营养化加重趋势,而其内源负荷及污染分布特征尚不清楚.本研究利用Peeper(pore water equilibrium)技术获取沉积物-水界面氮磷剖面特征,分析于桥水库间隙水氮磷分布的空间差异;采集沉积物无扰动柱样分析沉积物中易释放态氮及磷的赋存特征,并利用原柱样静态培养法对其水土界面氮磷交换速率进行估算.结果表明:(1)沉积物中活性磷、氨氮、硝态氮和亚硝态氮的含量分别为0.5~6.5、0.5~10.9、2.2~16.2和0.05~0.6 mg·kg~(-1),在垂直方向随深度增加营养盐含量降低,而在空间分布上差异显著.(2)上覆水中PO_4~(3-)-P和NH_4~+-N质量浓度较低,间隙水中PO_4~(3-)-P和NH_4~+-N质量浓度远大于上覆水,表明于桥水库间隙水具有向上覆水体扩散营养盐的潜力.在垂直方向上间隙水中PO_4~(3-)-P和NH_4~+-N具有在0~5 cm快速增加,之后表现出逐渐降低的趋势.(3)静态释放结果表明,PO_4~(3-)-P和NH_4~+-N从沉积物间隙水扩散至上覆水中,其释放通量分别为1.1~13.3 mg·(m~2·d)~(-1)和20.6~250.5 mg·(m~2·d)~(-1);NO-3-N交换通量在-20.4~33.4 mg·(m~2·d)~(-1)之间,NO_2~--N交换通量在-7.4~0.4 mg·(m~2·d)~(-1)之间.PO_4~(3-)-P和NH_4~+-N为于桥水库主要的沉积物内源向上覆水释放营养盐,总体释放速率在空间上呈现南高北低、淋河口和水坝前较高的释放特征.与类似研究比较可知,于桥水库沉积物-水界面通量相对较高,表明沉积物是于桥水库上覆水营养盐的重要来源.
|
| 关 键 词： | 于桥水库 沉积物-水界面 间隙水 分布特征 释放通量 |
| 收稿时间： | 2017/9/9 0:00:00 |
| 修稿时间： | 2017/10/31 0:00:00 |
Distribution Characteristics and Fluxes of Nitrogen and Phosphorus at the Sediment-water Interface of Yuqiao Reservoir |
| |
| WEN Shuai-long,GONG Wan-qing,WU Tao,ZHENG Xiao-lan,JIANG Xue,LI Xin and ZHONG Ji-cheng.Distribution Characteristics and Fluxes of Nitrogen and Phosphorus at the Sediment-water Interface of Yuqiao Reservoir[J].Chinese Journal of Environmental Science,2018,39(5):2154-2164. |
| |
| Authors: | WEN Shuai-long GONG Wan-qing WU Tao ZHENG Xiao-lan JIANG Xue LI Xin and ZHONG Ji-cheng |
| |
| Institution: | State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;University of Chinese Academy of Sciences, Beijing 100049, China,Tianjin Hydraulic Research Institute, Tianjin 300061, China,State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China;University of Chinese Academy of Sciences, Beijing 100049, China,State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China,State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China and State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China |
| |
| Abstract: | |
| |
| Keywords: | Yuqiao Reservoir sediment-water interface interstitial water spatial distribution diffusive flux |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《环境科学》浏览原始摘要信息 |
| 点击此处可从《环境科学》下载免费的PDF全文 |
|
