The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects
文献类型：期刊论文
| 作者 | Jing, Lian Dong1,2; Wu, Chen Xi1; Liu, Jian Tong1; Wang, Hua Guang1,2; Ao, Hong Yi1 |
| 刊名 | ECOLOGICAL ENGINEERING
 |
| 出版日期 | 2013-03-01 |
| 卷号 | 52页码:167-174 |
| 关键词 | Sediment dredging Nitrogen balance Dredging projects Environmental effectiveness |
| ISSN号 | 0925-8574 |
| 通讯作者 | Liu, JT (reprint author), Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China. |
| 中文摘要 | 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. |
| 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. |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine ; Technology |
| 类目[WOS] | Ecology ; Engineering, Environmental ; Environmental Sciences |
| 研究领域[WOS] | Environmental Sciences & Ecology ; Engineering |
| 关键词[WOS] | COMMUNITY STRUCTURE ; NITRATE REMOVAL ; LAKE ; PHOSPHORUS ; DENITRIFICATION ; PHYTOPLANKTON ; EUTROPHICATION ; RELEASE ; SHALLOW ; QUALITY |
| 收录类别 | SCI |
| 资助信息 | State Key Laboratory of Freshwater Ecology and Biotechnology [2009FB20]; Chinese "973" project [2009CB118705]; China's water environment special item [2008ZX07101-007] |
| 语种 | 英语 |
| WOS记录号 | WOS:000316827200021 |
| 公开日期 | 2013-10-31 |
| 源URL | [http://ir.ihb.ac.cn/handle/342005/19328]  |
| 专题 | 水生生物研究所_水环境工程研究中心_期刊论文 |
| 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 |
| 推荐引用方式 GB/T 7714 | Jing, Lian Dong,Wu, Chen Xi,Liu, Jian Tong,et al. The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects[J]. ECOLOGICAL ENGINEERING,2013,52:167-174. |
| APA | Jing, Lian Dong,Wu, Chen Xi,Liu, Jian Tong,Wang, Hua Guang,&Ao, Hong Yi.(2013).The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects.ECOLOGICAL ENGINEERING,52,167-174. |
| MLA | Jing, Lian Dong,et al."The effects of dredging on nitrogen balance in sediment-water microcosms and implications to dredging projects".ECOLOGICAL ENGINEERING 52(2013):167-174. |
入库方式： OAI收割
来源：水生生物研究所
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