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采用石灰性土壤无机磷分级法研究了不同肥力砂姜黑土无机磷的组成与分布。结果表明，砂姜黑土及其有机无机复合体中无机磷以磷酸＋钙盐和闭蓄态磷酸盐为主，分别占无机磷总量的２７％～４８％和２６％～３７％。土壤无机磷中的Ｃａ２－Ｐ、Ｃａ８－Ｐ、Ａｌ－Ｐ、Ｆｅ－Ｐ均与速效磷存在着显著的正相关，并且随着土壤肥力水平的提高，其含量亦随之增加。土壤无机磷主要集中分布于＜５μｍ粒级的有机无机复合体中，各种形态无机磷的含量一般均随着复合体粒径的增大而减少。
The composition and distribution of inorganic phosphorus in calcareous sand soil with different fertility were studied by calcareous soil inorganic phosphorus fractionation method. The results showed that inorganic phosphorus in the lime-black soil and its organic-inorganic complex mainly consisted of 27% -48% and 26% -37% of the total inorganic phosphorus, respectively. Soil inorganic phosphorus in the Ca2-P, Ca8-P, Al-P, Fe-P and available phosphorus were significantly positively correlated, and with the increase of soil fertility, its content also increases. Soil inorganic phosphorus mainly concentrates in <5μm organic-inorganic composites. The content of inorganic phosphorus in various forms generally decreases with the increase of the grain size of the composites.