作　　者： ; ; ; ; ;

机构地区： 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

出　　处： 《环境科学学报》 2010年第12期2526-2534,共9页

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. 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.

关 键 词： 崇明东滩 芦苇 氮 氧化亚氮 季节变化

领　　域： [环境科学与工程]