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选取四川盆地的紫色土、水稻土、潮土和黄壤4种代表性土壤作为研究对象,采用改进的M法与Tiessen法对土壤磷组分进行分级研究。结果表明:两种方法测得的磷组分含量及其占全磷的百分率除HCl-Pi外,无机磷组分均为紫色土显著高于水稻土、潮土和黄壤(P<0.05),而有机磷组分在这4种土壤中则差异不明显(P>0.05)。总体来看,两种方法间差异显著的组分主要为KCl-Pi和Na OH-Pi(P<0.05)。通过变异系数分析表明M法浸提的有机磷组分含量比Tiessen法重现性好。Pearson相关性分析表明两种方法测得的磷组分与全磷、速效磷、有机碳、全氮等的相关程度接近。回归分析表明,两种方法相同磷组分测定值间呈明显的线性关系(P<0.01),能通过校正系数相互转换。因此,增加有机磷组分测定及磷组分浸提时间均为4 h的M法可代替Tiessen法分级测定土壤中的磷组分。
Four representative soils of purple soil, paddy soil, alluvial soil and yellow soil in Sichuan Basin were selected as research objects. The phosphorus content in soil was classified by improved M method and Tiessen method. The results showed that the phosphorus content and the percentage of total phosphorus in the two methods were significantly higher than those in paddy soil, alluvial soil and yellow soil except HCl-Pi (P <0.05) However, the contents of organophosphorus in these four soils were not significantly different (P> 0.05). Overall, the most significant components of the two methods were KCl-Pi and Na OH-Pi (P <0.05). The analysis of coefficient of variation showed that the content of organic phosphorus extracted by M method was better than the Tiessen method. Pearson correlation analysis showed that phosphorus content measured by the two methods was close to that of total phosphorus, available phosphorus, organic carbon, total nitrogen and so on. Regression analysis showed that the two methods showed a significant linear relationship (P <0.01) between the measured values of the same phosphorus components, which could be converted by the correction coefficient. Therefore, the M method, which can increase the content of organic phosphorus and extract the phosphorus for 4 h, can be used instead of the Tiessen method to determine the phosphorus content in the soil.