【摘 要】
：
Water samples from 17 sites along the Jiulong River Estuary continuum were collected in summer (July,2010) and winter (January,2011).As end-products of denitrif
【机 构】
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EnvironmentalScienceResearchCenter,XiamenUniversity,Xiamen361005,China
【出 处】
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The 3rd Joint-Postgraduate Symposium(第三届高校研究生水环境科学研讨会)
论文部分内容阅读
Water samples from 17 sites along the Jiulong River Estuary continuum were collected in summer (July,2010) and winter (January,2011).As end-products of denitrification,dissolved N2 was measured by N2:Ar method using MIMS (HPR- 40),while the concentration of nitrous oxide dissolved in water was determined by Purge and Trap-Gas Chromatography.The result showed a significant spatial variance of net increase of dissolved N2 (ranging between -28.8 and 66.8 μmol L-1) and nitrous oxide (ranging between 4.3 and 102.8 nmol L-1,average 2.7‰ of total end-products) in the Jiulong River Estuary.The net increase of dissolved N2 and N2O decreased gradually from river sites to sea sites.Dissolved nitrous oxide was supersaturated by 170％-1063％ in all studied sites.The air-sea fluxes of N2 ranged between -17.6 and 53.2 mmol m-2 d-1,and N2O ranged between 5.2 and 70.4 μmol m-2 d-1.The result indicated that water temperature was a key factor influencing denitrification rate.Denitrification rate and its spatial pattern is mainly controlled by nitrate level in river sites but by salinity gradient due to tidal mixing in sea sites.
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