闽江河口短叶茳芏潮汐湿地甲烷排放通量

采用静态箱-气相色谱法，测定了闽江河口短叶茳芏（Cyperus malaccensis）潮汐湿地甲烷排放通量.结果表明：夏季和冬季短叶茳芏潮汐湿地甲烷排放通量的日变化范围分别在1.29～2.93 mg·m^-2·h^-1和0.06～0.22 mg·m^-2·h^-1；涨潮前、涨落潮过程中和落潮后甲烷排放通量分别在0.11～1.52 mg·m^-2·h^-1、0.10～1.05 mg·m^-2·h^-1和0.05～1.70 mg·m^-2·h^-1，月平均值分别为0.73、0.47和0.72 mg·m^-2·h^-1，其排放峰值均出现在9月，最低值出现在3月，涨落潮过程中的甲烷排放通量明显低于涨潮前和落潮后（P< 0.05）；甲烷排放通量的季节变化表现为：夏季>秋季>春季>冬季；潮汐是影响甲烷排放日变化的重要因子，植物生长阶段和温度是甲烷排放月变化和季节变化的主要控制因子.

Methane fluxes of Cyperus malaccensis tidal wetland in Minjiang River estuary

By using enclosed static chamber-gas chromatograph techniques, this paper measured the methane fluxes of Cyperus malaccensis tidal wetland in Minjiang River estuary. The diurnal variation of the methane fluxes in summer and winter were in the range of 1.29-2.93 mg·m^-2·h^-1 and 0
.06-0.22 mg·m^-2·h^-1, respectively. The methane fluxes before flooding, in the process of flooding and ebbing, and after ebbing were 0.11-1.52 mg·m^-2·h^-1,0.10-1.05 mg·m^-2·h^-1, and 0.05-1.70 mg·m^-2·h^-1, and the monthly averaged fluxes were 0.73, 0.47, and 0.72 mg·m^-2·h^-1, respectively. The methane fluxes peaked in September and reached the lowest in March, and were significantly lower in the process of flooding and ebbing than before flooding and after ebbing (P<0.05). The seasonal variation of the methane fluxes was in the order of summer > autumn > spring > winter. Tide was the key factor affecting the diurnal variation of the methane fluxes, while plant growth stage and temperature were the key factors determining the monthly or seasonal variation of the methane fluxes.