| Benthic nutrient fluxes in the intertidal flat within the Changjiang （Yangtze River） Estuary |
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| 作者姓名： | GAO Lei LI Daoji WANG Yanming YU Lihua KONG Dingjiang LI Mei LI Yun and FANG Tao State Key Laboratory of Marine Geology Tongji University Shanghai China State Key Laboratory of Estuarine and Coastal Research East China Normal University Shanghai China |
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| 作者单位： | GAO Lei1，2，LI Daoji2，WANG Yanming2，YU Lihua2，KONG Dingjiang2，LI Mei2，LI Yun2，and FANG Tao2 1 State Key Laboratory of Marine Geology，Tongji University，Shanghai 200092，China 2 State Key Laboratory of Estuarine and Coastal Research，East China Normal University，Shanghai 200062，China |
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| 基金项目： | This study is founded jointly by the Special Funds from the National Key Basic Research Program of P. R. China (2002CB412405 and 2004CB720505) and the Development Project of the Innovation Group from the Ministry of Education of P. R. China. |
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| 摘 要： | In an annual cycle from March 2005 to February 2006, benthic nutrient fluxes were measured monthly in the Dongtan intertidal flat within the Changjiang （Yangtze River） Estuary. Except for NH4^＋, there always showed high fluxes from overlying water into sediment for other four nutrients. Sediments in the high and middle marshes, covered with halophyte and consisting of macrofauna, demonstrated more capabilities of assimilating nutrients from overlying water than the low marsh. Sampling seasons and nutrient concentrations in the overlying water could both exert significant effects on these fluxes. Additionally, according to the model provided by previous study, denitrification rates, that utilizing NO3- transported from overlying water （Dw） in Dongtan sediments, were estimated to be from -16 to 193 μmol·h^-1·m^-2 with an average value of 63 μmol·h^-1·m^-2 （n=18）. These estimated values are still underestimates of the in-situ rates owing to the lack of consideration of DN, i.e., denitrification supported by the local NO3^- production via nitrification.
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| 关 键 词： | 潮水 长江 深海生物 元素化合物 |
| 收稿时间： | 2006-10-10 |
| 修稿时间： | 2007-02-05 |
Benthic nutrient fluxes in the intertidal flat within the Changjiang (Yangtze River) Estuary |
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| GAO Lei,,LI Daoji,WANG Yanming,YU Lihua,KONG Dingjiang,LI Mei,LI Yun,and FANG Tao State Key Laboratory of Marine Geology,Tongji University,Shanghai ,China State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai ,China.Benthic nutrient fluxes in the intertidal flat within the Changjiang (Yangtze River) Estuary[J].Chinese Journal of Geochemistry,2008,27(1):58-71. |
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| Authors: | Lei Gao Daoji Li Yanming Wang Lihua Yu Dingjiang Kong Mei Li Yun Li Tao Fang |
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| Institution: | (1) State Key Laboratory of Marine Geology, Tongji University, Shanghai, 200092, China;(2) State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, 200062, China |
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| Abstract: | In an annual cycle from March 2005 to February 2006, benthic nutrient fluxes were measured monthly in the Dongtan intertidal
flat within the Changjiang (Yangtze River) Estuary. Except for NH4
+, there always showed high fluxes from overlying water into sediment for other four nutrients. Sediments in the high and middle
marshes, covered with halophyte and consisting of macrofauna, demonstrated more capabilities of assimilating nutrients from
overlying water than the low marsh. Sampling seasons and nutrient concentrations in the overlying water could both exert significant
effects on these fluxes. Additionally, according to the model provided by previous study, denitrification rates, that utilizing
NO3
− transported from overlying water (DW) in Dongtan sediments, were estimated to be from −16 to 193 μmol·h−1·m−2 with an average value of 63 μmol·h−1·m−2 (n=18). These estimated values are still underestimates of the in-situ rates owing to the lack of consideration of DN, i.e., denitrification supported by the local NO3
− production via nitrification. |
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| Keywords: | benthic flux nutrient denitrification Changjiang (Yangtze River) Estuary |
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