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玉米-小麦轮作系统中氮肥反硝化损失与N_2O排放量

Keywords: 玉米,小麦,氮肥,有机肥,硝化反硝化,N_2O排放

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Abstract:

应用乙炔抑制-原状土柱培养法研究了玉米-小麦轮作周年中氮肥的反硝化损失和N2O排放量。结果表明,氮肥产生的N2O为1.77~2.82kgN·hm-2,占施氮量的0.49%~0.76%;反硝化损失量为3~3.18kgN·hm-2,占施肥量的0.81%~0.86%。玉米与小麦生长期间的氮肥反硝化损失率很相近,分别为0.7%~0.99%和0.77%~0.88%。反硝化作用和N2O排放与土壤含水量密切相关,有机肥与氮肥混施增加N2O排放量。反硝化不是该旱作系统氮肥损失的主要途径,但施用氮肥大大增加了N2O的排放,对环境造成一定的影响。

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