旱区覆膜滴灌棉田N_2O排放对化肥减量有机替代的响应

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覆膜滴灌条件下,采用静态箱-气相色谱法研究了不同施肥策略:CK(不施肥)、CF(N 300 kg/hm^2;P2O590 kg/hm^2;K2O 60 kg/hm^2)、60%CF+OF(普通有机肥6 000 kg/hm^2)、60%CF+BF(生物有机肥6 000 kg/hm^2)对棉田土壤N_2O排放的影响,旨在明确滴灌棉田连续不同施肥策略下土壤N_2O的排放特征。结果表明,棉花生育期N_2O排放通量表现为施肥处理大于不施肥处理,滴灌施肥后第3/4天N_2O排放通量顺序为CF〉60%CF+OF〉60%
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