水稻土中CH_4氧化的研究

Methane oxidation in paddy soil.

在实验室条件下研究了水稻土中CH4氧化的特性 .结果表明 ,在早稻种植前采集的水稻土不能氧化大气中的CH4,但当所供给的CH4浓度 >1 0 μl·L- 1 时 ,能迅速氧化CH4,所供给的CH4浓度越高 ,氧化CH4的速度越大 .经高浓度 ( >1 0 0 0 μl·L- 1 )的CH4预培养 1 0d ,可使本来不具有氧化大气CH4能力的土壤氧化大气CH4.大田CH4排放通量高的水稻土 ,氧化CH4的能力较大 .

The laboratory study on methane oxidation in paddy soil shows that soil sample collected before earlyrice transplanting can not oxidize atmospheric methane, but can oxidize the supplied methane quickly when its concetration is higher than 10 μl·L -1 . The oxidation rate of methane is increased with its initial concentration. After preincubated under high concentration of methane(>1000 μl·L -1 ) for 10 days, the soil which can not oxidize atmospheric methane begins to oxidize it. The study also shows that paddy soil with a high methane emission flux has a high potential of methane oxidation.