【摘要】 为了揭示覆膜滴灌对稻田CH₄综合排放的影响,采用比较分析法分析了覆膜滴管条件下稻田甲烷的排放变化。试验采用覆膜滴灌Ⅰ、覆膜滴灌Ⅱ和漫灌3个处理,分别对当地高产主栽品种吉旱1号进行CH₄排放通量的测定。结果表明,覆膜滴灌稻田CH₄排放通量显著高于漫灌稻田;覆膜滴灌处理条件下,土壤含水率高的覆膜滴灌Ⅰ稻田CH₄排放通量高于覆膜滴灌Ⅱ,说明土壤水分是稻田CH₄排放的主要影响因素之一;3个处理下CH₄的排放趋势大体一致,排放高峰均出现在水稻分蘖的前中期和拔节孕穗期,说明覆膜滴灌未改变稻田CH₄排放的进程。更多还原

【Abstract】 To reveal CH₄ emissions in rice fields under covered film drip irrigation, the comparative method was used to study the methane emission of rice paddy with drip irrigation under mulch film. Experiments were divided into three treatments: drip I, drip II and flooding. The local high-yielding cultivars Jihan 1 was used to analysis the methane emissions from rice paddy. The results showed that methane emission flux from rice fields under covered film drip irrigation was less than flooded conditions; methane emis-sion flux in drip Ⅰ was higher than that of drip Ⅱ, which indicated that the soil moisture content is one of the major factors which affect CH₄emission; methane emissions trend under three conditions were roughly the same, and the emission peaks were in mid tillering stage and jointing booting stage, which indicated that the process of CH₄ emission from paddy field under film drip irrigation was not changed.更多还原