Denitrification in Qi'ao Island coastal zone,the Zhujiang Estuary in China

查看全文 作　　者：WANG [1,2,3]Hu;ZHOU [2]Huaiyang;PENG [2]Xiaotong;YANG [2]Qunhui;QIN [1]Chaomei;YIN [1,3]Xijie;CHEN [1]Guangqian

机构地区：[1]Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;[2]State Key Laboratory. of Marine Geology, Tongji University, Shanghai 200092, China;[3]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Acta Oceanologica Sinica》索引2009年第28卷第1期,共10页

基　　金：The Key Program and General Program of the National Natural Science Foundation of China under contract Nos 40532011 and 40406010;COMRA’s 11th Five Year Program under contract No. DYXM115-02-4-04;the Natural Science Foundation of Guangdong Province under contract No.04300822 摘　　要：Samples of sediments and the overlying water were collected in the Qi'ao Island coastal zone,the Zhujiang(Pearl River) Estuary(ZE).Denitrification rates,sediment oxygen demand(SOD),and fluxes of inorganic nitrogen compounds were investigated with N2 flux method,using a self-designed continuous flow through and auto-sampling system.The results indicate that the denitrification rates varied between 222 and 908 μmol/(m2·h) with an average of 499 μmol /(m2·h).During incubation,the sediments absorbed dissolved oxygen in the overlying water with SOD ranging from 300 to 2 363 μmol/(m2·h).The denitrification rates were highly correlated with the SOD(r2=0.77) regardless of the NO-3+NO-2 concentrations in the overlying water,organic carbon contents in sediments and water temperature,suggesting that the SOD was probably the main environmental factor controlling the denitrification in the Qi'ao Island coastal zone.There was a net flux of NO-3+NO-2 into the sediments from the overlying water.The NH+4 flux from sediments into water as the result of mineralization was between 12.3 and 210.3 μmol/(m2·h),which seems limited by both organic carbon content in sediment and dissolved oxygen concentration in the overlying water. 关键词：淇澳岛珠江口反硝化超氧化物歧化酶海区溶解氧浓度有机碳含量自动取样系统

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Denitrification in Qi'ao Island coastal zone,the Zhujiang Estuary in China

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