崇明东滩芦苇湿地氧化亚氮排放  

Phragmites australis effects on N_2O emission in the Chongming eastern tidal flat

作　　者：李勇[1] 刘敏[1] 陆敏[1] 侯立军[2] 林啸[1] 

机构地区：[1]华东师范大学地理系教育部地理信息科学重点实验室,上海200062 [2]华东师范大学河口海岸学国家重点实验室,上海200062

出　　处：《环境科学学报》2010年第12期2526-2534,共9页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金资助项目(No.40671171;40701167;40971268);中央高校基本科研业务费专项基金资助;海洋公益性行业科研专项经费项目(No.200905007)~~

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 

分 类 号：X171.1[环境科学与工程—环境科学]