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不同稻草还田模式下双季稻田周年CH4排放特征及温室效应

DOI: 10.11654/jaes.2015.03.023, PP. 585-591

Keywords: 双季稻,稻田,稻草还田,甲烷

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Abstract:

采用静态箱-气相色谱法对南方双季稻田稻季无草翻耕冬季休闲(CK)、周年稻草焚烧还田翻耕(BST)、稻季稻草覆盖免耕冬季高桩(SNTH)、稻季稻草覆盖免耕冬季翻埋(SNTB)和稻季稻草翻耕还田冬季稻草翻埋(STB)5种稻草还田模式下双季稻田周年CH4排放进行观测,分析双季稻田周年CH4排放特征及其温室效应,旨在探索双季稻田CH4减排最佳的稻草还田方式及土壤耕作调控技术模式。结果表明:早、晚稻季CH4排放总量分别占全年CH4排放总量的43.9%和52.1%,冬闲季CH4排放比例很小,仅为4.0%;稻草还田显著增加了周年CH4排放总量(PBST>SNTB>SNTH>CK。可以看出,双季稻田稻季稻草覆盖免耕还田、冬季翻埋稻草还田或留桩还田能显著减缓因稻草直接还田CH4排放引起的温室效应,在南方双季稻区是一项可行的CH4周年减排的稻草还田调控技术模式。

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