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早稻灌浆乳熟期蓄水灌溉对产量及温室气体排放的影响

DOI: 10.11654/jaes.2015.03.025, PP. 599-605

Keywords: 早稻,蓄水深度,产量,温室气体

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Abstract:

为给湖南双季稻区稻田蓄水采用“早水晚用”的节水栽培模式提供理论依据,于早稻灌浆乳熟期起保持稻田不同的灌水深度(10、15、20cm),通过大田试验探讨不同灌水深度对早稻产量及温室气体排放的影响。结果表明:与常规水管理相比,灌深水有利于提高光合速率,但降低了结实率和千粒重,使产量减少3.1%~5.7%,但差异不显著;灌深水增加了62.7%~113.6%的CH4累积排放量,减少了63.1%~84.1%的N2O累积排放量,差异显著。各灌水处理中以灌水深10cm增排量最高,随着灌水深度增加增温潜势降低,各灌水处理的增温潜势超出常规水管理57.2%~96.6%。根据湖南降雨季节分布规律,加高加固田埂后,早稻成熟期蓄积20cm深水有利于双季稻区晚稻种植和节水。但蓄深水增加了CH4排放,对此有待进一步深入研究减排措施。

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