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题名: The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects
作者: Jing, Lian Dong1, 2; Wu, Chen Xi1; Liu, Jian Tong1; Wang, Hua Guang1, 2; Ao, Hong Yi1
通讯作者: Liu, JT (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China.
关键词: Sediment dredging ; Nitrogen balance ; Dredging projects ; Environmental effectiveness
刊名: ECOLOGICAL ENGINEERING
发表日期: 2013-03-01
DOI: 10.1016/j.ecoleng.2012.12.109
卷: 52, 页:167-174
收录类别: SCI
文章类型: Article
部门归属: [Jing, Lian Dong ; Wu, Chen Xi ; Liu, Jian Tong ; Wang, Hua Guang ; Ao, Hong Yi] Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China ; [Jing, Lian Dong ; Wang, Hua Guang] Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine ; Technology
资助者: State Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007]
类目[WOS]: Ecology ; Engineering, Environmental ; Environmental Sciences
研究领域[WOS]: Environmental Sciences & Ecology ; Engineering
摘要: Sediment dredging is a controversial technology for eutrophication control. It is necessary to understand its environmental effectiveness and mechanisms. In this study, sediments from un-dredged (UDR), fresh-dredged (FOR) and post-dredged (PDR, 3 years later) regions of Dongqian Lake were collected to compose sediment-water microcosms for evaluating the effects of dredging on nitrogen cycling. From 0 to 19 days, ammonia in the overlying Water greatly increased in UDR (603.1%) and FOR (269.3%), but slightly in PDR (88.7%). The increase of ammonia concentration in water was negatively correlated with DO which was higher in two dredged groups than that in un-dredged groups. These results suggest that dredging could lead to ammonia release to water column in a short term, while ammonia release risk is low few years after dredging. In addition to high DO content, high Eh values, low pH and sediment porosity in two dredged groups may weaken the attenuation of nitrate. TN contents in both sediment and overlying water indicate that nitrogen lost in un-dredged group while had no significantly change in two dredged groups, indicating the ability of nitrogen removal in dredged groups was weakened. Our study suggests that dredging may have potentials to weaken nitrate and/or nitrogen removal from lake systems over years. For this, we should pay more attention on dredging area in dredging projects. Moreover, dredging is better to be conducted in low temperature seasons after blocking external nutrient loadings. (C) 2013 Elsevier B.V. All rights reserved.
英文摘要: Sediment dredging is a controversial technology for eutrophication control. It is necessary to understand its environmental effectiveness and mechanisms. In this study, sediments from un-dredged (UDR), fresh-dredged (FOR) and post-dredged (PDR, 3 years later) regions of Dongqian Lake were collected to compose sediment-water microcosms for evaluating the effects of dredging on nitrogen cycling. From 0 to 19 days, ammonia in the overlying Water greatly increased in UDR (603.1%) and FOR (269.3%), but slightly in PDR (88.7%). The increase of ammonia concentration in water was negatively correlated with DO which was higher in two dredged groups than that in un-dredged groups. These results suggest that dredging could lead to ammonia release to water column in a short term, while ammonia release risk is low few years after dredging. In addition to high DO content, high Eh values, low pH and sediment porosity in two dredged groups may weaken the attenuation of nitrate. TN contents in both sediment and overlying water indicate that nitrogen lost in un-dredged group while had no significantly change in two dredged groups, indicating the ability of nitrogen removal in dredged groups was weakened. Our study suggests that dredging may have potentials to weaken nitrate and/or nitrogen removal from lake systems over years. For this, we should pay more attention on dredging area in dredging projects. Moreover, dredging is better to be conducted in low temperature seasons after blocking external nutrient loadings. (C) 2013 Elsevier B.V. All rights reserved.
关键词[WOS]: COMMUNITY STRUCTURE ; NITRATE REMOVAL ; LAKE ; PHOSPHORUS ; DENITRIFICATION ; PHYTOPLANKTON ; EUTROPHICATION ; RELEASE ; SHALLOW ; QUALITY
语种: 英语
WOS记录号: WOS:000316827200021
ISSN号: 0925-8574
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/19328
Appears in Collections:水环境工程研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

Recommended Citation:
Jing, LD; Wu, CX; Liu, JT; Wang, HG; Ao, HY.The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects,ECOLOGICAL ENGINEERING,2013,52():167-174
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