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本文通过牧场试验，探讨了黑龙江省西部草地土壤无机磷形态，结果表明，四种草地土壤均以Ｃａ－Ｐ为主，约占无机磷总量的６０％左右，Ｏ－Ｐ含量少于Ｆｅ－Ｐ和Ａｌ－Ｐ．草甸黑钙土无机磷总量最高，Ｃａ２－Ｐ、Ｃａ８－Ｐ和Ａｌ－Ｐ都是草甸黑钙土重要的贮磷库；草甸风沙土无机磷总量最低，但Ｃａ８－Ｐ含量相对较高；草甸碱土无机磷总量、Ｃａ２－Ｐ和Ａｌ－Ｐ含量显著高于碱化草甸土．向草甸碱土和碱化草甸土施磷酸二铵能显著增加土壤无机磷的总量，尤其显著提高土壤中Ｃａ８－Ｐ和Ａｌ－Ｐ含量．
In this paper, we investigated the inorganic phosphorus forms in the grassland of western Heilongjiang Province through pasture experiments. The results showed that all the four grassland soils were dominated by Ca-P, accounting for about 60% of the total inorganic phosphorus, with less O-P content than Fe- P and Al-P. The total amount of inorganic phosphorus in the meadow calcareous soil was the highest, and Ca2-P, Ca8-P and Al-P were the important phosphate-storing reservoirs in the meadow calcareous soil. The content of inorganic phosphorus in meadow sandy soil was the lowest, The content of inorganic phosphorus, Ca2-P and Al-P in meadow alkaline soil was significantly higher than that in alkalized meadow soil. Impoundment of diammonium phosphate on meadow alkaline soil and alkalized meadow soil can significantly increase the total amount of inorganic phosphorus in soil, especially significantly increase the content of Ca8-P and Al-P in soil.