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本文采用蒋柏藩等提出的石灰性土壤无机磷分级体系，结合春小麦盆栽试验。结果表明，供试土壤中８０％左右的磷以无机磷形式存在，而且其中Ｃａ－Ｐ占了绝大多数。无机磷的组成如下：Ｃａ１０－Ｐ（４４．１％～７２．６％）＞Ｃａ８－Ｐ（７．０６％～２１．９５％）＞Ｏ－Ｐ（１０．６９％～１６．３５％）＞Ａｌ－Ｐ（２．８０％～９．０１％）≥Ｆｅ－Ｐ（３．１２％～７．３９％）＞Ｃａ２－Ｐ（１．２６％～７．０６％）。利用通径分析讨论各形态无机磷对有效磷的相对贡献得出如下结论：Ｏｌｓｅｎ法提取的有效磷主要是Ｃａ２－Ｐ，Ａｌ－Ｐ和Ｏ－Ｐ是Ｃａ２－Ｐ的有效补充；两季春小麦盆栽试验结果一致表明，供应作物吸收的磷主要是Ａｌ－Ｐ和Ｃａ８－Ｐ，Ｆｅ－Ｐ和Ｏ－Ｐ在一定条件下可成为植物有效磷的补充；Ｃａ２－Ｐ因数量少而作用不明显；Ｃａ１０－Ｐ则不能被吸收利用。
In this paper, Jiang Baofan et al proposed lime soil inorganic phosphorus grading system, combined with spring wheat pot experiment. The results showed that about 80% of the phosphorus in the soil was in the form of inorganic phosphorus, and Ca-P accounted for the vast majority. The composition of inorganic phosphorus is as follows: Ca10-P (44.1% -72.6%)> Ca8-P (7.06% -21.95%)> O-P (10.69% -16.35% > Al-P (2.80% ~ 9.01%) ≥Fe-P (3.12% ~ 7.39%)> Ca2-P (1.26% ~ 7.06%). Using the path analysis to discuss the relative contribution of inorganic phosphorus to available phosphorus in different forms, the following conclusions are drawn: The effective phosphorus extracted by Olsen method is mainly Ca2-P, Al-P and O-P are effective supplements of Ca2-P; The results of pot experiment showed that the phosphorus uptake by crops was mainly Al-P and Ca8-P, and Fe-P and O-P could supplement plant-available phosphorus under certain conditions. However, Ca2-P ; Ca10-P can not be absorbed and utilized.