Abstract:

This paper studied the components of inorganic P(P-o) and organic P in yellow soil，red soil，purple soil and lateritic red earth in Fujian mountainous region. The results showed that O-P was the primary form of the inorganic phosphorus in the soils, followed by Fe-P and Al-P. The proportion of O-P to total P(TP) was in order lateritic red earth＞red soil ＞purple soil＞yellow soil. There were negative correlations between the O-P content and organic matter，pH，CEC. The P-o content and the ratio of P-o/TP were in order yellow soil＞purple soil＞red soil＞lateritic red earth. From south to north of the region，the proportions of Po/TP and the P-o contents decreased gradually. Along the latitude, from high to low, LP-o/P-o reduced，and the MLP-o and HLP-o rose gradually. The degree of correlations between fractions of P-o and various available P was in order LP-o＞MLP-o＞MSP-o＞HSP-o, while the degree of correlations between fractions of organic P and various available P was O-P＞Al-P＞Fe-P in the soils.

Key words: Fujian mountainous region, soil great group, inorganic P, organic P, form