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氮肥配施下不同C/N作物残渣还田对红壤温室气体排放的影响

DOI: 10.11654/jaes.2014.10.025, PP. 2053-2062

Keywords: 作物残渣还田,温室气体排放,C/N,氮肥配施,红壤

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Abstract:

肥配施能够促进还田秸秆的分解,为了解其对不同C/N秸秆还田下温室气体排放的影响,采用培养实验方法,研究了油菜饼(C/N为4)、玉米秸秆(C/N为28)、水稻秸秆(C/N为41)和小麦秸秆(C/N为71)等4种不同C/N植物残渣在不同量氮肥(无氮、低氮和高氮)配施下对红壤温室气体(CO2、CH4和N2O)排放的影响。结果显示,氮肥配施增加了不同植物残渣的CO2-C累积排放量,且仅在高C/N的小麦秸秆处理中发现存在显着性差异,在低氮和高氮下CO2-C累积排放量分别达到1271.44、1212.83mg·kg-1,显着高于无氮肥配施的883.40mg·kg-1.土壤N2O累积排放量最大的为油菜饼处理组,低氮量的配施进一步增强了N2O的产生,其累积排放量达到5550.42μg·kg-1,显着高于无氮肥配施的4430.44μg·kg-1,然而当氮肥施用量进一步增加时却抑制了N2O的排放(3752.84μg·kg-1).氮肥配施并未显着影响玉米秸秆和小麦秸秆处理组的N2O累积排放量。在培养期内,每一个处理均表现为CH4的吸收现象,氮肥施用能够增加土壤对CH4的累积吸收量,但差异显着性仅在对照和油菜饼处理中发现。

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