Nitrous oxide (N_2O) emissions from a mesotrophic reservoir on the Wujiang River,southwest China

查看全文 作　　者：Xiaolong [1]Liu;Siliang [2]Li;Zhongliang [1]Wang;Guilin [3]Han;Jun [1]Li;Baoli [2]Wang;Fushun [4]Wang;Li [1]Bai

机构地区：[1]Tianjin Key Laboratory of Water Resources and Environment,Tianjin Normal University;[2]Institute of Surface-Earth System Science,Tianjin University;[3]School of Scientific Research,China University of Geosciences (Beijing);[4]Applied Radiation Institute,School of Environmental and Chemical Engineering,Shanghai University

出　　处：《Acta Geochimica》索引2017年第36卷第4期,共13页

基　　金：financially supported by the National Key Research and Development Program of China through grant 2016YFA0601000;the National Major Scientific Research Program Grant No.2013CB956401;the National Natural Science Foundation of China through Grants Nos.41325010,41403082,and 41302285;the Tianjin Research Program of Application Foundation and Advanced Technology Grant No.14JCQNJC08800 摘　　要：Aquatic ecosystems have been identified as a globally significant source of nitrous oxide(N_2O) due to continuous active nitrogen involvement, but the processes and influencing factors that control N_2O production are still poorly understood, especially in reservoirs. For that, monthly N_2O variations were monitored in Dongfeng reservoir(DFR)with a mesotrophic condition. The dissolved N_2O concentration in DFR displayed a distinct spatial–temporal pattern but lower than that in the eutrophic reservoirs. During the whole sampling year, N_2O saturation ranging from 144% to 640%, indicating that reservoir acted as source of atmospheric N_2O. N_2O production is induced by the introduction of nitrogen(NO_3^-, NH_4^+) in mesotrophic reservoirs, and is also affected by oxygen level and water temperature. Nitrification was the predominate process for N_2O production in DFR due to well-oxygenated longitudinal water layers.Mean values of estimated N_2O flux from the air–water interface averaged 0.19 μmol m^(-2)h^(-1) with a range of 0.01–0.61 μmol m^(-2)h^(-1). DFR exhibited less N_2O emission flux than that reported in a nearby eutrophic reservoir, but still acted as a moderate N_2O source compared with other reservoirs and lakes worldwide. Annual emissions from the water–air interface of DFR were estimated to be 0.32×10~5 mol N–N_2O, while N_2O degassing from releasing water behind the dam during power generation was nearly five times greater. Hence, N_2O degassing behind the dam should be taken into account for estimation of N_2O emissions from artificial reservoirs, an omission that historically has probably resulted in underestimates. IPCC methodology should consider more specifically N_2O emission estimation in aquatic ecosystems, especially in reservoirs, the default EF5 model will lead to an overestimation. 关键词：Nitrous oxide Mesotrophic reservoir Nitrogen dynamics IPCC methodology

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Nitrous oxide (N_2O) emissions from a mesotrophic reservoir on the Wujiang River,southwest China

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