Title :
Seasonal Variation of Denitrification Rate in Estuary Sediments of Liaohe, China
Author :
Guan Daoming ; Fan Jingfeng ; Chen Jiayin ; Shi Feng ; Ming Hongxia ; Chen Liguang ; Zhao Huade
Author_Institution :
Nat. Marine Environ. Monitoring Center, Dalian, China
Abstract :
The regulatory effects of environmental factors and denitrifying bacteria on denitrification were studied in the estuary sed iments of L ia oh e. Seasonal variation of denitrification rates over a one-year period were measured using the acetylene inhibition technique (AIT). Denitrification rates ranged at 2.4116.75 μmol/ (m2·h) in spring (May), 0.61113.14 μmol/ (m2 ·h) in summer (August), and 2.11106.87 μmol/ (m2·h) in fall (November), indicating an apparent seasonal variation. Sediment denitrification rates were greatest in the spring and lowest in the summer and early autumn, primarily due to seasonal differences in nitrate concentration and water temperature. Of various environmental factors on denitrification that we assessed, nitrate was determined to be the key factor limiting denitrification rates in the sediments of Liaohe. In addition, at the two sites denitrification rates were also regulated by DO. Positive and linear relationships were regularly observed between denitrification rate and the number of denitrifying bacteria.
Keywords :
ocean chemistry; ocean temperature; sediments; Liaohe estuary sediments; acetylene inhibition technique; environmental factors; nitrate concentration; regulatory effects; seasonal variation; sediment denitrification rates; water temperature; Correlation; Environmental factors; Market research; Microorganisms; Ocean temperature; Sediments; Springs; Liaohe estuary; denitrification rate; denitrifying bacteria; environmental factor; sediment;
Conference_Titel :
Intelligent System Design and Engineering Applications (ISDEA), 2013 Third International Conference on
Conference_Location :
Hong Kong
Print_ISBN :
978-1-4673-4893-5
DOI :
10.1109/ISDEA.2012.295