中文摘要：

2007年利用静态箱-气相色谱仪法对闽江河口区最大的鳝鱼滩芦苇湿地和入侵种互花米草斑块涨潮前、涨落潮过程及落潮后甲烷通量季节动态进行了原位测定,并利用室内培养-气相色谱仪法测定了芦苇湿地不同土层土壤甲烷产生潜力.结果表明,鳝鱼滩芦苇湿地全年均属于大气甲烷的排放源,排放通量具有明显的季节变化;涨潮前、涨落潮过程和落潮后甲烷通量大小并无一致的规律,平均排放通量分别为5.13、5.06和4.74 mg·m^-·2h^-1,差异不显著,其中涨落潮过程排放到潮水和大气环境的甲烷通量分别为2.98和2.08 mg·m^-·2h^-1.互花米草入侵斑块年均甲烷排放通量（11.02 mg·m^-·2h^-1）明显高于芦苇湿地年均甲烷排放通量（4.98 mg·m^-·2h^-1）,互花米草入侵明显增加了闽江河口区湿地的甲烷排放通量.芦苇湿地0-40 cm土壤中甲烷产生潜力范围为0.029-0.123μg·g^-1·d^-1,0-5 cm土层的甲烷产生潜力最大,且与其它土层差异显著（p〈0.05）.气温、土壤温度和地上生物量对芦苇湿地甲烷排放影响显著（p〈0.05）,落潮后芦苇湿地甲烷排放通量与盐度有负相关关系.

英文摘要：

Seasonal and diel variation of methane flux from a Phragmites australis wetland and a Spartina alterniflora invasive patch were measured using the enclosed chamber technique. Samples were taken in 2007 before flood, in flooding and ebbing, and after ebb. Potential rates of methane production from the soil layers were also measured using an incubation method. The results indicated that the Shanyutan Phragmites australis wetland, which is the biggest Phragmites australis wetland in the Min River estuary area, was a methane source all year. There was considerable monthly variation with emissions higher before the flood in some months, whereas in other months emission was either higher after the ebb or there was no difference. The average methane flux before flood, in flooding and ebbing, and after ebb were 5.13 、5.06 and 4.74 mg· m^-2· h^-1, respectively. In the flooding and ebbing process, the methane emission to flood water was 2.98 mg· m^-2· h^-1 while emission to the atmosphere was 2.08 mg· m^-2· h^-1. Methane flux from the Spartina alterniflora invasive patch was 11.02 mg· m^-2· h^-1, which was higher than that of the Phragmites australis wetland. Soil methane production potential （0 -40 cm depth） ranged from 0. 029 - 0. 123 μg· g^-1· d^-1. The greatest production was in the surface 5 cm, which showed a significant difference with other soil layers （p 〈 0.05）. Air and soil temperature and above ground biomass had a significant impact on methane fluxes （p 〈 0.05, and there was a negative correlation between methane fluxes and salinity after ebb.