黑龙江省西部草地土壤无机磷的形态

Forms of Inorganic Phosphorus in Grassland Soils of Western Heilongjiang Province

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．

A pasture experiment was conducted on the grasslands of western Heilongjiang province to determine the soil inorganic phosphorus forms. The result showed that Ca-P was predominant inorganic forms of soil phosphorus in four grasslands. It accounted for about 60% of soil inorganic phosphorus, and O-P contents were lower than those of Fe-P and Al-P. Meadow chernozem had the largest size of soil inorganic phosphorus, contributed by large amounts of Ca2-P, Ca8-P and Al-P. Meadow arenosols had the smallest size of soil inorganic phosphorus, but their Ca8-P was comparatively larger than other forms of phosphorus. The sizes of Ca2-P and Al-P were both larger in meadow solonetz than those in alkaline meadow soil. The application of diammonium phosphate on meadow solonetz and alkaline meadow soils significantly increased soil inorganic phosphorus, especially Ca8-P and Al-P.