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盐度对河口湿地甲烷气体的产生与排放影响重大.为揭示海水入侵对河口湿地CH4排放的影响,利用静态密闭箱—气相色谱法在2016年4～10月期间对崇明东滩芦苇群落CH4气体的排放通量进行测定.结果表明:CH4排放总体表现出春夏季较高,秋冬季较低的季节变化规律;排放通量在0.19～7.68mg /(m2·h) 间波动,4～10 月这半年内平均排放通量为 3. 41 mg /(m2·h).在一定范围内,较高的盐度抑制 CH4 的产生与排放,较低的盐度不足以对 CH4 产生抑制作用,甚至会促进 CH4 的产生; 在高盐环境下, CH 4排放通量与盐度呈现出显著的对数负相关关系.在芦苇群落生长旺盛的初期(4 ～ 6 月),CH4 排放通量与温度、光照呈现正相关关系; 而在芦苇生长后期(7 ～ 10 月) 则呈现负相关关系.“,”Salinity has a profound influence on methane(CH4) production and emission in estuarine wetlands. In order to reveal the effects of seawater intrusion on CH 4 emission from estuarine wetlands,static closed chamber combined with a gas chromatograph technique was used to investigate the flux of CH4 at a Phragmites australis wetland in Chongming Dongtan from april to october in 2016. The results showed that the flux of CH4 was higher in spring and summer than in autumn and winter. The flux ranged from 0. 19 to 7. 68 mg /(m2·h) and the average flux was 3. 41 mg /(m2·h) from april to october. High salinity level inhibits the production and emission of CH4,while low salinity promotes CH 4 production within certain range. In high-salinity conditions,CH4 emission flux has a significant logarithmic negative correlation with salinity. In the early stage of growth of Phragmites australis,the flux of CH4 is positively correlated with temperature and light; however,in the later stage of growth,it is negatively correlated with temperature and light.