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草业学报  2014 

不同种植年限紫穗槐根际非根际土壤磷组分含量特征

DOI: 10.11686/cyxb20140608, PP. 61-68

Keywords: 毛乌素沙地,紫穗槐,不同种植年限,根际土壤,磷组分

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Abstract:

以不同种植年限的紫穗槐根际和非根际土壤为试验对象,采用Tiessen等修正后的Hedley土壤磷素分级方法,对其有效磷、全磷及不同形态磷组分进行了分析研究。结果表明,不同年限根际土壤有效磷含量均高于非根际土壤。从无机磷含量特征可以看出除了H2O-Pi(水溶磷)和Conc.HCl-Pi(浓HCl提取无机磷)外,其余无机磷均是Y60的含量最高。不同形态磷:除Y28的NaHCO3-Po(0.5mol/LNaHCO3提取有机磷)外,其他株龄的NaHCO3-Pi(0.5mol/LNaHCO3提取无机磷),NaOH-Pi(0.1mol/LNaOH提取无机磷),NaHCO3-Po,NaOH-Po(0.1mol/LNaOH提取有机磷),Conc.HCl-Po(浓HCl提取有机磷)含量均是根际高于非根际土壤相应磷指标含量。根际土壤有效磷与Dil.HCl-Pi和Conc.HCl-Po含量显著相关(P<0.05),H2O-Pi与Total-P含量显著相关(P<0.05),根际和非根际土壤有效磷与pH值和根际全磷含量相关性均不显著(P>0.05)。

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