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对海南岛6种类型土壤不同施磷量的室内干湿培养和应用土壤无机磷分级方法，研究水溶性磷肥在热带上壤中的转化和有效性。结果表明：施磷处理经室内干湿培养8a，磷在土壤中的转化速率低于盆栽作物条件，特别是土壤O－p在培养前后变化很微。其中土壤有效P以年均4．5％的幅度下降，Al－p和Fe－p分别以年均2．1％和1．7％的幅度下降，而Ca－p和O－p则分别以年均1．2％和0．2％的幅度增长。土壤有效磷的变化趋势与Al－p、Fe－p相一致，而与Ca－p和O－p相反，说明磷肥在土壤中转化形成的Al－p和Fe－p为活性态P，是热带上镶有效磷的主要形态。
The indoor wet and dry cultivation of six different types of soil in Hainan Island and the application of soil inorganic phosphorus classification method were conducted to study the transformation and availability of water-soluble phosphate fertilizer in the tropical soil. The results showed that the phosphorus conversion rates in the soil were lower than those in the potted plants by applying dry and wet indoor cultivation of phosphorus, and the changes of soil O-p changed little before and after cultivation. Soil available P decreased with an average annual rate of 4.5%, while Al-p and Fe-p decreased by 2.1% and 1.7% respectively, while Ca-p and O-p decreased Average annual growth rate of 1.2% and 0.2%. The trend of available P in soil is consistent with that of Al-p and Fe-p, but opposite to that of Ca-p and O-p, indicating that Al-p and Fe-p formed by transformation of P in soil are active P, Inlay on the main form of available phosphorus.