In situ nitrogen removal processes in intertidal wetlands of the Yangtze Estuary  

作　　者：Cheng Liu Lijun Hou Min Liu Yanling Zheng Guoyu Yin Hongpo Dong Xia Liang Xiaofei Li Dengzhou Gao Zongxiao Zhang 

机构地区：[1]State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China [2]Key Laboratory of Geographic Information Science(Ministry of Education),East China Normal University,Shanghai 200241,China [3]School of Geographic Sciences,East China Normal University,Shanghai 200241,China [4]Key Laboratory for Humid Subtropical Eco-geographical Processes of the Ministry of Education,Fujian Normal University,Fuzhou 350007,China

出　　处：《Journal of Environmental Sciences》2020年第7期91-97,共7页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.41725002,41671463,41601530,41761144062,and41730646);the Fundamental Research Funds for the Central Universities;Chinese National Key Programs for Fundamental Research and Development(Nos.2016YFA0600904,2016YFE0133700)。

摘　　要：Estuarine and intertidal wetlands are important sites for nitrogen transformation and elimination.However,the factors controlling nitrogen removal processes remain largely uncertain in the highly dynamic environments.In this study,continuous-flow experiment combined with 15 N isotope pairing technique was used to investigate in situ rates of denitrification and anaerobic ammonium oxidation(anammox)and their coupling with nitrification in intertidal wetlands of the Yangtze Estuary.The measured rates varied from below the detection limit to 152.39μmol N/(m^2·hr)for denitrification and from below the detection limit to 43.06μmol N/(m^2·hr)for anammox.The coupling links of nitrogen removal processes with nitrification were mainly dependent on nitrate,organic carbon,sulfide,dissolved oxygen and ferric iron in the estuarine and intertidal wetlands.Additionally,it was estimated that the actual nitrogen removal processes annually removed approximately 5%of the terrigenous inorganic nitrogen discharged into the Yangtze Estuary.This study gives new insights into nitrogen transformation and fate in the estuarine and intertidal wetlands.

关 键 词：DENITRIFICATION ANAMMOX SEDIMENT Intertidal wetland Yangtze estuary 

分 类 号：X52[环境科学与工程—环境工程]