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中文摘要：
基于高精度测量仪器Vectrino小威龙点式流速仪，对崇明东滩高潮滩盐沼前缘进行为期7d的连续观测和采样．采用纳氏试剂光度法对样品进行分析，分析结果表明：NH4^＋-N浓度分布在0～1．1652mg·L^-1，平均为0．3830mg·L^-1；涨潮时潮滩沉积物成为NH4^＋—N的源，落潮时潮滩沉积物表现为NH4^＋-N的汇；沉积物-水界面NH4^＋-N垂直分布存在复杂的变化特征；近底层10cm处潮汐流速对NH4^＋-N浓度的影响机制十分复杂．
英文摘要：
Using the high precision apparatus -Vectrino Velocimeter, we made a seven -day continuous observation and sampiing on the edge of the salt marsh sediment - water interface in east ChongMing High Tidal Flat. The samples were analyzed by Nessler＇s reagent dectrophotometry. The analysis results indicated that the ammonia concentration of NH4^＋-N was between 0 and 1. 1652 mg ·L^-1 in the vertical profile, with an average of 0. 3830 mg · L^-1; during flooding phase, tidal flat sediment became a source of NH4 ^＋-N while during ebbing phase, it became a collection of NH4^＋ -N. The vertical distribution of NH4^＋ -N in sediment -water interface was complex. In the water layer of the lowest 10 cm thick, the influence mechanism that tide velocity would have on NH4 ^＋-N was very complex.
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