• 关键词：崇明东滩  芦苇  氮  氧化亚氮  季节变化

• 基金项目：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)

• 李勇
• 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

• 刘敏
• 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

• 陆敏
• 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

• 侯立军
• 华东师范大学河口海岸学国家重点实验室, 上海 200062

• 林啸
• 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

• 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^-2·h^-1增加到566.28μg·m^-2·h^-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^-2·h^-1增加到67.54μg·m^-2·h^-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.

• Abstract：We investigated the emission fluxes of N₂Ofrom 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 NO₃^--Nin the high tidal flat without vegetation cover were similar to those in the reed rhizospheric sediments.Compared with NO₃^--N,the variations of NH ₄⁺-Ndiffered between bare and vegetated sediments.The reed was observed to significantly enhance the release of N₂O from sediments.N₂Oeffluxes were respectively 0.71 and -4.02 μg·m^-2·h^-1in bare sediments in July and January whereas they increased to 566.28μg·m^-2·h^-1and 67.54μg·m^-2·h^-1in rhizospheric sediments in both seasons.Besides NO₃^--N,NH ₄⁺-N,temperature and water content,the physiological processes of plant also controlled the N₂Oemission.

• Key words：Chongming Dongtan  Phragmites australis  nitrogen  nitrous oxide  seasonal variation

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