首页  |  本刊简介  |  编委会  |  投稿须知  |  订阅与联系  |  微信  |  出版道德声明  |  Ei收录本刊数据  |  封面
沉积物-水界面氮的源解析和硝化反硝化
摘要点击 2838  全文点击 1178  投稿时间:2016-06-17  修订日期:2016-11-04
查看HTML全文 查看全文  查看/发表评论  下载PDF阅读器
中文关键词  沉积物-水界面  硝酸盐  氮氧同位素  稳定同位素源解析(SIAR)  反硝化速率
英文关键词  sediment-water interface  nitrate  nitrogen and oxygen isotopes  stable isotope analysis in R(SIAR)  denitrification rate
作者单位E-mail
金赞芳 浙江工业大学环境学院, 杭州 310032 jinzanfang@zjut.edu.cn 
龚嘉临 浙江工业大学环境学院, 杭州 310032  
施伊丽 浙江工业大学环境学院, 杭州 310032  
金漫彤 浙江工业大学环境学院, 杭州 310032  
李非里 浙江工业大学环境学院, 杭州 310032 lifeili@zjut.edu.cn 
中文摘要
      掌握沉积物-水界面氮的循环过程,对有效控制地表水氮污染具有关键的作用.通过采集西湖不同季节的柱状芯样,利用氮、氧同位素技术及稳定同位素源解析模型(stable isotope analysis in R,SIAR)并结合乙炔抑制法研究沉积物-水界面氮的来源及迁移转化.结果表明,硝酸盐(NO3-)和氨氮(NH4+)在沉积物-水界面均存在浓度梯度,NO3-自底层水向间隙水扩散,是为沉积物累积;NH4+自间隙水向底层水扩散,是为沉积物释放.西湖底层水硝化作用明显,硝酸盐来源包括生活污水(粪肥)、土壤氮、化肥和降雨,生活污水(粪肥)是主要来源,其在夏季贡献率高达60.8%.间隙水中特别高的δ15 N值反映西湖沉积物-水界面存在强烈的反硝化作用.西湖沉积物-水界面硝化速率和反硝化速率的平均值分别为2.85 mmol·(m2·d)-1和23.51 μmol·(m2·d)-1,沉积物-水界面在水体氮素去除过程中作用显著.硝化速率和反硝化速率时空变化显著.温度和溶解氧是影响西湖沉积物-水界面氮迁移转化的主要因素.
英文摘要
      Identifying nitrate sources and its transformation mechanisms are important for nitrate pollution control in surface water. The columnar core sediment samples in West Lake were taken in different seasons. The transformation of nitrogen at the sediment-water interface was studied using nitrogen and oxygen isotopes, stable isotope analysis in R (SIAR) and acetylene inhibition method in the West Lake, Hangzhou. The results showed that the concentration gradient of both NO3-and NH4+ existed at the sediment-water interface. NO3- concentrations decreased from bottom water to pore water and NO3- was accumulated in sediments. NH4+ concentrations increased from bottom water to pore water and NH4+ was released from sediments. Nitrate sources in bottom water where nitrification exited were sewage (manure), soil nitrogen, chemical fertilizer and precipitation. Sewage (manure) was the major nitrogen contributor (60.8%) in summer. Particularly high δ15 N values in pore water indicated that there was strong denitrification at the sediment-water interface in West Lake. The average nitrification rate and denitrification rate at the sediment-water interface were 2.85 mmol·(m2·d)-1 and 23.51 μmol·(m2·d)-1, respectively. The sediment-water interface played a role in nitrogen removal process in aquatic environment. Seasonal and spatial variations of nitrification rates and denitrification rates were found in this study. Temperature and dissolved oxygen were the main influential factors for the transformation of nitrogen at the sediment-water interface in West Lake.

您是第51715657位访客
主办单位:中国科学院生态环境研究中心 单位地址:北京市海淀区双清路18号
电话:010-62941102 邮编:100085 E-mail: hjkx@rcees.ac.cn
本系统由北京勤云科技发展有限公司设计  京ICP备05002858号-2