Significance of dredging on sediment denitrification in Meiliang Bay, China: A year long simulation study

Journal of Environmental Sciences
By: , and 

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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.

Additional publication details

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