麦季稻秆施用对后续稻季CH_4产生氧化及排放的影响

Effects of Rice Straw Application in Wheat Season on Production,Oxidation and Emission of CH_4 During the Following Rice-Growing Season

通过室内培养和田间试验研究了2007年麦季稻秆施用对2008年稻季CH4产生潜力、氧化潜力和排放通量的影响。结果表明,水稻生长前期,稻秆还田处理的CH4氧化潜力仅在水稻移栽后19 d时表现为显著高于稻秆不还田处理,而两处理的CH4产生潜力与排放通量均无显著差异;水稻生长中期,两处理的CH4氧化潜力无显著差异,稻秆还田处理的CH4产生潜力及排放通量均显著高于稻秆不还田处理,其中稻秆还田处理的CH4产生潜力是稻秆不还田处理的2~4倍;水稻生长后期,两处理的CH4产生潜力、氧化潜力和排放通量均无显著差异。CH4排放主要发生在水稻生长中期。水稻全生育期内,稻秆还田处理的CH4排放总量为稻秆不还田处理的1.4倍。

Laboratory incubations and field experiments were carried out to study the effects of rice straw application in wheat season in 2007 on CH4 production potential,CH4 oxidation potential,and CH4 flux from the paddy field during the following rice-growing season in 2008.The results indicated that CH4 oxidation potential in treatment SA（straw application）was significantly higher than that in treatment NS（no straw）at 19th day after rice transplantation,while no significant differences were observed in CH4 production potential and CH4 flux between the two treatments at the early rice growth stage.During the middle rice growth stage,no significant difference in CH4 oxidation potential was observed between the two treatments,both CH4 production potential and CH4 flux in treatment SA were significantly higher than those in treatment NS.The CH4 production potential in treatment SA was 2~4 times that in treatment NS.At the end of the rice growth stage,there were no significant differences were observed between the two treatments in production,oxidation,and emission of CH4.The CH4 emissions mainly occurred in the middle rice growth stage.The total CH4 emission in treatment SA was 1.4 times that in treatment NS in the whole rice season.