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长期不同施肥下我国旱地红壤N2O释放特征及其对土壤性质的响应

Keywords: N2O释放,红壤,长期施肥,土壤性质

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Abstract:

为评价长期不同施肥下红壤N2O释放特征及其与土壤性质的关系,以湖南祁阳摞荒地(CKo)、不施肥对照(CK)、单施氮磷钾化肥(NPK)、施有机肥(M)、有机肥配施化肥(NPKM)和秸秆配施化肥(NPKS)6个处理的红壤为研究对象,进行为期30d的培养,测定其N2O释放量、有机质、全氮、碱解氮、速效磷、速效钾、NH+4-N、NO-3-N含量及其pH值。结果表明:6个处理的N2O释放量差异显著(PNPKS>M≈NPKM>CK>CKo。施用有机态氮与等量无机态氮相比,前者N2O释放量较低。N2O释放量与土壤性质的关系较为复杂,其与铵态氮、硝态氮和碱解氮呈极显著正相关(P<0.01),而与C/N、pH值呈极显著负相关(P<0.01)。多元回归和通径分析进一步显示,全氮、C/N、碱解氮、硝态氮和pH值与N2O的释放量直接相关。本研究表明长期施肥及其土壤性质显著影响红壤N2O释放量。

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