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麦季稻秆施用对后续稻季CH4产生 氧化及排放的影响

Keywords: 秸秆还田,CH4产生潜力,CH4氧化潜力,CH4排放通量

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Abstract:

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19d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。

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