首页 | 本学科首页   官方微博 | 高级检索  
     检索      

Significance of dredging on sediment denitrification in Meiliang Bay, China: A year long simulation study
作者姓名:Jicheng Zhong  Chengxin Fan  Lu Zhang  Edward Hall  Shiming Ding  Bao Li  Guofeng Liu
作者单位:Department;Freshwater;Ecology;University;Vienna;Althanstr;
基金项目:supported by the National Natural Science Foundation of China (No.40730528,40901253);;the Social Development Key Project and Natural Science Foundation of Jiangsu Province (No.BE2009603,BK2009333);;the Knowledge Innovation Program of Chinese Academy of Sciences (No.CXNIGLAS200804)
摘    要:An experiment for studying the effects of sediment dredging on denitrification in sediments was carried out through a one-year incubation of undredged (control) and dredged cores in laboratory. Dredging the upper 30 cm of sediment can significantly affect physico-chemical characteristics of sediments. Less degradation of organic matter in the dredged sediments was found during the experiment. Denitrification rates in the sediments were estimated by the acetylene blockage technique, and ranged from 21.6 to 102.7 nmol N2/(g dry weight (dw)·hr) for the undredged sediment and from 6.9 to 26.9 nmol N2/(g dw·hr) for dredged sediments. The denitrification rates in the undredged sediments were markedly higher (p0.05) than those in the dredged sediments throughout the incubation, with the exception of February 2006. The importance of various environmental factors on denitrification was assessed, which indicated that denitrification was regulated by temperature. Nitrate was probably the key factor limiting denitrification in both undredged and dredged sediments. Organic carbon played some role in determining the denitrification rates in the dredged sediments, but not in the undredged sediments. Sediment dredging influenced the mineralization of organic matter and denitrification in the sediment; and therefore changed the pattern of inherent cycling of nitrogen.

关 键 词:反硝化作用  底泥疏浚  沉积物  梅梁湾  模拟  中国  物理化学特性  有机物降解
收稿时间:17 March 2009
修稿时间:2 July 2009

Significance of dredging on sediment denitrification in Meiliang Bay, China: A year long simulation study
Jicheng Zhong,Chengxin Fan,Lu Zhang,Edward Hall,Shiming Ding,Bao Li,Guofeng Liu.Significance of dredging on sediment denitrification in Meiliang Bay, China: A year long simulation study[J].Journal of Environmental Sciences,2010,22(1):68-75.
Authors:Jicheng Zhong  Chengxin Fan  Lu Zhang  Edward Hall  Shiming Ding  Bao Li and Guofeng Liu
Institution:1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
2. Department of Freshwater Ecology, University of Vienna Althanstr, 14A-1090 Vienna, Austria
Abstract:An experiment for studying the effects of sediment dredging on denitrification in sediments was carried out through a one-year incubation of undredged (control) and dredged cores in laboratory. Dredging the upper 30 cm of sediment can significantly affect physico-chemical characteristics of sediments. Less degradation of organic matter in the dredged sediments was found during the experiment. Denitrification rates in the sediments were estimated by the acetylene blockage technique, and ranged from 21.6 to 1...
Keywords:sediment dredging  denitrification  Taihu Lake  
本文献已被 CNKI 维普 万方数据 ScienceDirect 等数据库收录!
点击此处可从《环境科学学报(英文版)》浏览原始摘要信息
点击此处可从《环境科学学报(英文版)》下载免费的PDF全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号