长江口潮滩沉积物－水界面无机氮交换通量

doi:10.11821/xb200502016

地理学报 ›› 2005, Vol. 60 ›› Issue (2): 328-336.doi: 10.11821/xb200502016

长江口潮滩沉积物－水界面无机氮交换通量

陈振楼, 王东启, 许世远, 张兴正, 刘杰

华东师范大学资源与环境科学学院, 地理信息科学教育部重点实验室, 上海 200062

收稿日期:2004-09-16 修回日期:2004-11-18 出版日期:2005-03-25 发布日期:2005-03-25
作者简介:陈振楼 (1964-), 男, 上海人, 教授, 博士生导师, 中国地理学会理事, 主要从事城市水环境和水资源、河口滨岸生物地球化学研究。E-mail: zlchen@geo.ecnu.edu.cn
基金资助:
国家自然科学基金项目 (40173030; 40131020); 国家教育部优秀青年教师资助计划项目; 上海市基础研究重点项目 (02DJ14029)

Inorganic Nitrogen Fluxes at the Sediment-water Interface in Tidal Flats of the Yangtze Estuary

CHEN Zhenlou, WANG Dongqi, XU Shiyuan, ZHANG Xingzheng, LIU Jie

Key Laboratory of Geographical Information Science of the Ministry of Education, College of Resource and Environmental Science, East China Normal University, Shanghai 200062, China

Received:2004-09-16 Revised:2004-11-18 Online:2005-03-25 Published:2005-03-25
Supported by:
National Natural Science Foundation of China, No.40173030; No.40131020; Excellent Young Teacher Program of the Ministry of Education; Key Program of Shanghai Science Foundation, No.02DJ14029

摘要/Abstract

摘要：

对长江口滨岸潮滩7个典型断面三态氮的界面交换通量进行了三年多的季节性连续观测,结果表明无机氮的界面交换行为存在复杂的空间分异和季节变化。NO^-₃-N和NH⁺₄-N的界面交换通量正负变化范围较大,分别介于-32.82~24.13 mmol.m^-2.d^-1和-18.45~10.65mmol.m^-2.d^-1之间;而NOsup>-₂-N的界面交换通量很小,仅为-1.15~2.82 mmol.m^-2.d^-1。NO^-₃-N的界面交换具有明显的上下游季节性时空分异特征,而NH⁺₄-N的界面交换则表现为南北岸季节性时空分异现象。盐度是控制长江口滨岸潮滩NH⁺₄-N界面交换行为的主要因素,而沉积物粒度、水体 NO^-₃-N浓度、沉积物有机质含量、水温和溶解氧含量则以不同的组合方式,共同制约着 NO^-₃-N在潮滩界面交换的时空分异格局。

关键词: 无机氮, 交换通量, 沉积物－水界面, 潮滩, 长江口

Abstract:

Inorganic nitrogen fluxes at the sediment-water interface of seven typical sites in tidal flats of the Yangtze estuary had been determined seasonally during more than three years. The results revealed that the sediment-water exchanges of inorganic nitrogen appeared to be of complicated spatial differences and seasonal variations. The measured fluxes of NO^-₃-N and NH⁺₄-N in the Yangtze estuary were higher than those in other estuaries, varying respectively from -32.82 to 24.13 mmol·m^-2·d^-1 and from -18.45 to 10.65 mmol·m^-2·d^-1. However, the fluxes of NO^-_{2/sub>-N were very low, and only varied from -1.15 to 2.82 mmol·m^-2·d^-1. The spatial and seasonal differences between the upper and lower estuary for the NO^-₃-N fluxes were observed clearly, but the NH⁺₄-N fluxes exhibited the spatial and seasonal differences between the south and north bank. It had been recognized that the NH⁺₄-N exchange behavior was mainly controlled by the salinity, whereas the NO^-₃-N exchange behavior was influenced by the different combinations of the sediment grain size, nitrate concentration in overlying water, sediment organic matter content, water temperature and dissolved oxygen concentration.}

Key words: inorganic nitrogen, exchange flux, sediment-water interface, tidal flat, Yangtze estuary

陈振楼, 王东启, 许世远, 张兴正, 刘杰. 长江口潮滩沉积物－水界面无机氮交换通量[J]. 地理学报, 2005, 60(2): 328-336.

CHEN Zhenlou, WANG Dongqi, XU Shiyuan, ZHANG Xingzheng, LIU Jie. Inorganic Nitrogen Fluxes at the Sediment-water Interface in Tidal Flats of the Yangtze Estuary[J]. Acta Geographica Sinica, 2005, 60(2): 328-336.

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长江口潮滩沉积物－水界面无机氮交换通量

Inorganic Nitrogen Fluxes at the Sediment-water Interface in Tidal Flats of the Yangtze Estuary

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