Methane efflux from refoolded and reforested tropical peatland

为了预测以CO2减排为目标的热带干枯泥炭地洪涝复林对甲烷排放的响应，研究了土壤甲烷排放对水位的响应以及通过千层树对甲烷排放的响应。淹水条件下土壤甲烷流出量与排水条件下相似或更少，表明淹水增加土壤甲烷流出量的可能性不大。探测到千层乔木的甲烷外排，表现出水位响应和时间波动，但与再驱CO2减排相比，甲烷外排值较小。厚而多层的黑桫椤树皮是甲烷通过树体排出的主要途径。

In order to predict the response of methane emission accompanying reflooding and reforestation aiming at emission reduction of CO2 from drained tropical peatlands, response of soil methane efflux to water level and methane efflux through Melaleuca cajputi trees were investigated. Soil methane efflux under flooded conditions were similar or less than under drained condition, suggesting little possibility of increase in soil methane efflux by reflooding. Methane efflux through Melaleuca trees were detected, showing water level response and temporal fluctuation, which was rather small value when compared with the CO2 emission reduction by reflooding. The thick, multi-layered bark of Melaeluca trees was revealed to be the major pathway of the methane efflux through tree body.