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菜地土壤N_2O排放及其氮素反硝化损失

Keywords: 菜地土,水稻土,N2O排放,反硝化损失

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Abstract:

采用培养试验方法,对南京郊区3对菜地土和水稻土的N2O排放和氮素反硝化损失进行了研究。不加乙炔培养测定土壤N2O排放,加乙炔(10%V/V)培养测定反硝化损失。菜地土为相同类型水稻土改种为蔬菜约20年的土壤。结果表明,在培养0~1d期间,菜地土本身N2O排放通量(5.15~218.37ngN·g-1soil·h-1)均高于相同类型的水稻土(2.50~3.94ngN·g-1soil·h-1)。3对供试土壤中,2个菜地土培养21d排放的N2O总量与反硝化损失总量均显著高于相同类型的水稻土(P<0.05)。3对供试土壤施尿素后反硝化损失均未显著增加。施肥和不施肥处理,土壤N2O排放累积量和反硝化损失累积量随时间t的变化均符合修正的Elovich方程y=bln(t)+a。

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