从广东省各蔬菜基地采集101个表层土壤，测定土壤Olsen-P、Bray-P和CaCl2-P，以确定不同质地土壤的磷淋失临界值。结果表明，Olsen-P与CaCl2-P呈显著的线性关系，随着土壤Olsen-P的增加，CaCl2-P也呈现增加的趋势，存在1个明显的突变点，即土壤磷淋失临界值，壤质粘土的临界值为79.74 mg/kg，粘壤土的临界值为51.08 mg/kg，砂质粘壤土的淋失临界值为43.99 mg/kg，砂质壤土的淋失临界值为8.63 mg/kg，淋失临界值从高到低的顺序依次是：壤质粘土＞粘壤土＞砂质粘壤土＞砂质壤土，与不同质地粘粒含量的表现规律一致。在砂质粘壤土上Bray-P与CaCl2-P呈显著的线性关系，但不存在明显的突变点，在壤质粘土、粘壤土和砂质壤土上，Bray-P与CaCl2-P未呈现显著的线性关系，不存在明显的突变点。因此，在本试验条件下，Olsen-P可以作为不同质地土壤磷淋失临界值指标。
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