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本文对陕西关中石灰性土壤中磷的存在形态进行了分级测定,并以盆栽试验做参比项,用相关分析与通径分析说明各级磷态对土壤有效磷的相对贡献,进而评价石灰性土壤不中同形态磷酸盐对冬小麦的有效性.结果表明,水溶性磷是Olsen法所提出速效磷的主要形态,其它形态无机磷都可在不同程度上补充水溶性磷,其中主要是磷酸铝盐议(Al-P)和易溶的磷酸钙盐(Cz-P_I).此结论与盆栽试验的作物吸磷情况基本一致.
In this paper, the phosphorus forms in calcareous soils of Guanzhong of Shaanxi Province were graded, and pot experiments were used as reference terms. Correlation analysis and path analysis were used to illustrate the relative contributions of phosphorus at all levels to soil available P, The results showed that water-soluble phosphorus was the main form of available phosphorus proposed by Olsen method. Other forms of inorganic phosphorus could be supplemented to some extent with water-soluble phosphorus, mainly including aluminum phosphate Salinity (Al-P) and soluble calcium phosphate (Cz-P_I) .This conclusion is basically consistent with the phosphorus uptake by crops in pot experiment.