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本文建立了土壤供磷特性连续提取动力学分析的原理和方法，并用该方法研究了３种不同土壤供磷特性的差异，并且与饱和吸附法作了比较。结果表明：（１）扬州砂壤土、浙江丽水黄壤和江西红壤土壤有效磷的供应容量、吸附态和弱固定态磷的溶解度、有效磷的供应速度或负向缓冲能力和磷的供应强度均为：扬州砂壤＞浙江丽水黄壤＞江西红壤。（２）不同土壤对水溶性磷的固定能力为：江西红壤＞浙江丽水黄壤＞扬州砂壤土
In this paper, the principle and method of continuous extraction kinetic analysis of phosphorus supply in soil were established. The difference of phosphorus supply characteristics in three different soils was studied by this method and compared with that of saturated adsorption. The results showed that: (1) The availability of soil available phosphorus, the adsorption capacity, the solubility of weakly fixed phosphorus, the available phosphorus supply rate, the negative buffer capacity and the phosphorus supply intensity of Yangzhou sandy loam, Lishui yellow soil and red soil of Jiangxi were : Yangzhou sandy soil> Zhejiang Lishui yellow soil> Jiangxi red soil. (2) The fixing ability of different soil on water-soluble phosphorus is: red soil in Jiangxi> yellow soil in Lishui, Zhejiang> sandy loam in Yangzhou