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为弄清湖南省双季稻田土壤无机磷的形态及其与土壤有效磷的关系，运用张氏法和蒋氏法两个分级体系对湖南省临澧、醴陵、湘乡３县（市）双季稻田土壤无机磷形态进行分级研究．结果表明，风化程度较高的第四纪红土母质发育的红黄泥田，土壤无机磷以Ｏ－Ｐ和Ｆｅ－Ｐ为主，占无机磷总量的７８．７％；而风化程度较低的紫泥田和河沙泥田，土壤无机磷以Ｃａ－Ｐ为主，分别占无机磷总量的４７．０％和４５．９％，Ｆｅ－Ｐ和Ｏ－Ｐ也占了相当大的比例，大致与Ｃａ－Ｐ的含量相当，但无机磷的总量较红黄泥田高．相关分析结果表明，Ｆｅ－Ｐ，Ｃａ２－Ｐ和Ａｌ－Ｐ与有效磷之间均呈极显著的正相关，是土壤有效磷的主要来源．蒋氏法不仅适用于北方的石灰性土壤无机磷形态的区分，同样适用于南方大面积分布的中、酸性双季稻田土壤无机磷形态的区分．
In order to find out the relationship between inorganic phosphorus and soil available phosphorus in the double cropping paddy soils in Hunan Province, we used the two grading systems of Zhang’s and Jiang’s methods to study the effects of double cropping of Linqu, Liling and Xiangxiang in Hunan Province Paddy soil inorganic phosphorus morphology grading studies. The results show that in the red and yellow paddy fields with high degree of weathering and Quaternary purplish red soil parent material, inorganic phosphorus is dominated by O-P and Fe-P, accounting for 78.7% of the total inorganic phosphorus; while the degree of weathering is relatively low Purple clay soil and river sand muddy soil. The content of inorganic phosphorus in soil was mainly Ca-P, accounting for 47.0% and 45.9% of the total inorganic phosphorus respectively. Fe-P and O-P also accounted for a considerable proportion, Compared with the content of Ca-P, the total amount of inorganic phosphorus is higher than that of red and yellow mud fields. Correlation analysis showed that there was a significant positive correlation between Fe-P, Ca2-P and Al-P and available phosphorus, which was the main source of available phosphorus in soil. Jiang’s method not only applies to the distinction of inorganic phosphorus forms in the calcareous soil in the north, but also applies to the distinction of the inorganic phosphorus forms in the medium and acidic double cropping paddy fields with large area in the south.