区域环境与生态
李勇,刘敏,陆敏,侯立军,林啸.崇明东滩芦苇湿地氧化亚氮排放[J].环境科学学报,2010,30(12):2526-2534
崇明东滩芦苇湿地氧化亚氮排放
- Phragmites australis effects on N2O emission in the Chongming eastern tidal flat
- 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)
- 作者
- 单位
- 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.
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