长江口北支潮滩沉积物-水界面无机氮的交换通量及季节变化

对长江口北支地区沉积物--水界面无机氮的交换通量及季节变化进行了研究。由于沉积物--水界面无机氮的交换行为受到不同环境因子的影响，随着季节更替，氮的界面交换行为有较大的差异。一方面，滨岸地区的沉积物对水体中的氮有着良好的去除能力，是水体中硝氮、氨氮的汇；另一方面，由于河口滨岸生态系统是一个脆弱的并且处于动态变化的系统，随着外界条件的变化，河口沉积物--水界面的物质交换会受到很大的影响，有可能从营养盐的汇转化为营养盐的源，对水体造成二次污染。研究揭示：生物活动、温度、溶解氧等环境因子在沉积物--水界面氮的季节交换行为中作用明显，而盐度、Eh等因子的作用是次要的。

Nitrogen Fluxes and Seasonal Change at the Sediment-Water Interface in Northern Yangtze River Estuary

We studied IN fluxes and seasonal varieties at the sediment-water interface in northern Yangtze river.Because the fluxes of IN at the sediment-water interface are influenced by several environmental factors as well as change of seasons,the fluxes of IN have great difference.For on side,sediments at the estuary are the pool of nitrate and ammonium and can alleviate much nitrogen load,for another,the estuary ecology system are brittle and dynamic.The substance exchanges will be influenced much with the changes of these environment factors,and sediments may probably contaminated the overlying water.The research showed:Some environmental factors such as biology,temperature,DO et al,have major influences on seasonal changes of nitrogen fluxes,while some other factors,such as the salinity,Eh et al,have minor influences on seasonal nitrogen fluxes.