中文摘要：

以闽江河口区面积最大的鳝鱼滩湿地分布的3种植物沼泽湿地：土著种咸草（Cyperus malaccensis Lam.var.brevifolius Bocklr.）沼泽湿地、芦苇（Phragmites australis）沼泽湿地及外来入侵种互花米草（Spartina alterniflora Loisel.）沼泽湿地为研究对象,于2009年1月到12月利用静态箱-气相色谱仪法测定了涨潮前、涨落潮过程和落潮后3个阶段沼泽湿地排向大气环境的CO2通量（生态系统呼吸量）.结果表明,芦苇沼泽湿地3个阶段CO2排放通量月平均值均最高,分别为（563.7±119.8）、（230.3±54.2）和（506.2±83.8）mg·m^-2·h^-1;3种植物沼泽湿地在涨落潮过程直接排向大气环境的CO2通量显著低于涨潮前和落潮后2个阶段（p〈0.05）,涨潮前和落潮后CO2排放通量无显著差异（p〉0.05）,潮水水淹显著减少了河口潮汐沼泽湿地直接排向大气环境的CO2通量.芦苇和咸草沼泽湿地CO2排放通量与大气温度和土壤温度（10cm深度）均具有显著的正线性关系.

英文摘要：

CO2 emission to the atmosphere and its seasonal variation in 2009 were studied using an enclosed static chamber technique from three tidal marshes dominated respectively by two native species of Cyperus malaccensis var.bervifolius and Phragmites australis（common reed）,and an alien invasive species of Spartina alterniflora in the Shanyutan Wetland in the Min River Estuary,southeast China.Measurements were taken during three tidal stages（exposed-before flood,submerged-flooding and ebbing process,and exposed-after ebb）.There were considerable monthly variations with greater CO2 emissions before flood in some months,whereas at other months greater CO2 emission after ebb.The monthly averaged CO2 emissions during three tidal stages from the P.australis stand were highest,which were（563.7±119.8）,（230.3±54.2） and（506.2±83.8） mg · m^-2 · h^-1,respectively.Tidal inundation had an obvious affect on CO2 emission.CO2 emissions from these three plant stands were all significantly lower during the period of tidal inundation（submerged-flooding and ebbing process） than that at the exposed-stage（before flood and after ebb）（p0.05）.However,there was no significant difference on CO2 emissions observed between before flood stage and after ebb stage.CO2 emissions from the P.australis stand and the C.malaccensis stand had a significant positive correlation with soil and air temperature.