Significance of dredging on sediment denitrification in Meiliang Bay, China: A year long simulation study
Journal of Environmental Sciences
By: Jicheng Zhong, Chengxin Fan, Lu Zhang, Hall Edward, Shiming Ding, Bao Li, and Guofeng Liu
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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 102.7 nmol N2/(g dry weight (dw) x hr) for the undredged sediment and from 6.9 to 26.9 nmol N2/(g dw x hr) for dredged sediments. The denitrification rates in the undredged sediments were markedly higher (p < 0.05) 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.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Significance of dredging on sediment denitrification in Meiliang Bay, China: A year long simulation study |
| Series title | Journal of Environmental Sciences |
| DOI | 10.1016/S1001-0742(09)60076-0 |
| Volume | 22 |
| Issue | 1 |
| Year Published | 2010 |
| Language | English |
| Publisher | Society of Environmental Engineers |
| Publisher location | Los Angeles, CA |
| Description | 8 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Environmental Sciences |
| First page | 68 |
| Last page | 75 |
| Google Analytic Metrics | Metrics page |