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长期施肥对绿洲农田土壤有机碳和无机碳的影响

, PP. 592-597

Keywords: 绿洲,土壤,施肥,无机碳,有机碳,土壤固碳,干旱地区

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Abstract:

以中国科学院阜康荒漠生态站的绿洲农田养分循环长期定位试验(始于1990年)为研究平台,研究了无施肥处理(CK)、单施化肥处理(NPK)、有机/无机配施处理(NPKM)和秸秆还田处理(NPKS)下,土壤无机碳(SIC)和有机碳(SOC)在剖面和各施肥年限的含量变化特征及其影响。结果表明施肥、剖面层次和施肥年限对SOC与SIC含量变化影响显著(P<0.01)。在各施肥处理中,与CK相比,NPK、NPKM和NPKS的SOC与SIC含量明显增加(P<0.05),并且有机/无机肥配施模式下的SIC含量显著高于单施化肥模式;在剖面层次间,SIC含量从0~20cm的9.12g/kg增加到40~60cm的9.94g/kg,而SOC变化趋势与之相反。表明合理施肥能够增加土壤表层有机碳含量,有机/无机配施会使耕层以下土壤无机碳增加。

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