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The diffusive fluxes of inorganic nitrogen across the intertidal sediment- water interface of the Changjiang Estuary in China

ISSN号：0253-505X
期刊名称：《海洋学报：英文版》
时间：0
分类：P734.2[天文地球—海洋化学;天文地球—海洋科学]
作者机构：[1]State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China, [2]Department of Geography, Key Laboratory of Geo-Information Science of the Ministry of Education, East China Normal University, Shanghai 200062, China
相关基金：Acknowledgements This research is part of the project of the biogeochemical cycling of multi-materials in the Changjiang estuarine and coastal complex ecosystem supported by the National Natural Science Key Foundation of China under contract Nos 40131020 and 49801018, the Tidal Flat Project by Science and Technology Committee of Shanghai under contract No. 04DZ12049, China Postdoctoral Science Foundation under contract No. 2005037135 and Shanghai Postdoctoral Science Foundation under contract No.04R214122. The anonymous reviewers are thanked for their constructive comments on a preliminar draft of the manuscript.

作者： HOU Lijun[1,2], LIU Min[2], XU Shiyuan[2], LU Jianjian[1], OU Dongni[2], YU Jie[2]

关键词：铵, 硝酸盐, 沉淀物-水界面, 长江港口, 潮间带, 海洋化学, ammonium, nitrate, sediment - water interface, intertidal flat, Changjiang Estuary

中文摘要：

铵和硝酸盐集中在从十个车站收集的近底部的水和孔隙水里被分析内部 Changjiang 河口的潮滩在 4 月， 7 月， 11 月和 2 月期间。benthic 交换流动的大小在有修改 Fick 的计算的联合在近底部的水和孔隙水接口是铵和硝酸盐的浓度梯度的坚定的在基础“ s 第一条法律。铵流动变化了从 - 5。05 ～ 1.43 μ g /(cm~2？d ) 并且被铵的生产极大地在表面沉积调整，当硝酸盐流动从 -0 时。38 ～ 1。36 μ g /(cm~2？d ) 并且被硝酸盐集中在潮汐的水里统治。而硝酸盐主要从 overlying 水被传播到，铵主要车站至多被免除沉积进水列，这被发现内部潮汐的沉积。总共， 823。75 t/a ammonium-Nwas 过去了从内部当时，流水的潮汐的沉积大约 521。90 t/a nitrate-N 从 overlying 水被移开到内部潮汐的沉积。这建议那内部潮汐的沉积在 modulating 上有重要影响潮汐的水里的无机的氮。

英文摘要：

Ammonium and nitrate concentrations were analyzed in near-bottom water and pore water collected from ten stations of the intertidal flat of the Changjiang Estuary during April, July, November and February. The magnitudes of the benthic exchange fluxes were determined on the basis of concentration gradients of ammonium and nitrate at the near-bottom water and interstitial water interface in combination with calculations of a modified Fick＇ s first law. Ammonium fluxes varied from - 5.05 to 1.43 μg/（ cm^2·d） and were greatly regulated by the production of ammonium in surface sediments, while nitrate fluxes ranged from - 0. 38 to 1.36 μg/ （ cm^2·d） and were dominated by nitrate concentrations in the tidal water. It was found that ammonium was mainly released from sediments into water columns at most of stations whereas nitrate was mostly diffused from overlying waters to intertidal sediments. In total, 823.75 t/a ammonium-N was passed from intertidal sediments to water while about 521.90 t/a nitrate-N was removed from overlying waters to intertidal sediments. This suggests that intertidal sediments had the significant influence on modulating inorganic nitrogen in the tidal water.

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