中文摘要：

采用静态箱-气相色谱法,研究了崇明东滩芦苇带氧化亚氮（N2O）的排放通量.结果表明,在生长季,高潮滩无植被覆盖沉积物与芦苇根际土中NO3--N的含量变化趋势基本一致,而两者的NH4＋-N的含量变化趋势则有所不同;芦苇对高潮滩沉积物N2O排放有较强的促进作用,特别是7月份,使高潮滩沉积物的排放量由0.71μg·m-·2h-1增加到566.28μg·m-·2h-1.而在1月份,芦苇根际土N2O的通量也存在小幅排放,由-4.02mg·m-·2h-1增加到67.54μg·m-·2h-1.对于芦苇根际沉积物而言,除NO3--N、NH4＋-N、温度和水分以外,植物的生理过程也是控制N2O排放通量的主要因子.

英文摘要：

We investigated the emission fluxes of N2O from the Phragmites australis marsh of Chongming Dongtan in the Yangtze estuary,using a static chamber combined with a gas chromatograph.The results showed that within the growth seasons,the changes of NO 3--N in the high tidal flat without vegetation cover were similar to those in the reed rhizospheric sediments.Compared with NO 3--N,the variations of NH 4＋-N differed between bare and vegetated sediments.The reed was observed to significantly enhance the release of N2O from sediments.N2O effluxes were respectively 0.71 and-4.02 μg·m-·2h-1in bare sediments in July and January whereas they increased to 566.28μg·m-2·h-1and 67.54μg·m-·2h-1in rhizospheric sediments in both seasons.Besides NO 3--N,NH 4＋-N,temperature and water content,the physiological processes of plant also controlled the N2O emission.