芦苇湿地温室气体甲烷(CH_4)排放研究

CH_4 emissions from the reed wetland

用封闭式箱法对辽河三角洲芦苇湿地温室气体 CH4 的观测结果表明 ,其排放有明显的季节变化规律。淹水前 ,土壤为 CH4 汇。淹水期间 ,有大量的 CH4 排放。排水后 ,CH4 排放明显减少。在测定期内 ,CH4 排放通量为 -968～2 73 4 μg CH4 l/ (m2· h)。另外 ,土壤中产生的 CH4 主要是通过芦苇植株的传输作用进入到大气中。试验结果还表明 ,有芦苇生长的湿地 CH4 排放是无芦苇生长的 1 5倍。同时 ,建议芦苇田应采用间歇灌溉的水分管理措施 ,这样既能促进植株生长 ,又能减少 CH4

Determination of the CH 4 flux from the reed wetland of Liaohe delta, China using closed chamber technique showed that the emission of CH 4 from the reed wetland had a significant seasonal variation. Before irrigation, wetland soil absorbed CH 4.Higher emission rate of CH 4 occured durin the flooding period. And after drainage, CH 4 emission decreased significantly. CH 4 flux from reed wetland ecological system during the period of measurement was -968～2734μgCH 4/(m 2·h). In addition, CH 4 released into atmosphere was mainly through the transportion of reed plant. The experimental result also showed that CH 4 emission from the wetland dominated with reeds was fifteen times greater than that without reeds. We suggest that the reed field should be flooded by intermittent management, which improves both growth of reeds and mitigates emission of CH 4.