不同肥力红壤及其复合体无机磷分布特征

DISTRIBUTION OF THE INORGANIC PHOSPHATES IN DIFFERENT FERTILITY RED SOILS AND THEIR COMPLEXES

试验采自江西省临川县第四纪红色粘土发育的红壤为样品进行研究表明：红壤及其复合体中Ｏ－Ｐ，Ａｌ－Ｐ，Ｃａ－Ｐ，Ｆｅ－Ｐ的质量分数在同一粒径的复合体随肥力水平提高而增加，同一土壤中不同粒径的复合体４种不同形态无机磷质量分数随粒径增大而减小红壤中不同形态无机磷主要存在于＜２μｍ的复合体中，随着粒径增大，其质量分数迅速减少培肥土壤，可以迅速增加Ａｌ－Ｐ的质量分数。

Complexes in various size fractions from different fertility red soils were obtained from Quaternary red clay in Linchuan, Jiangxi. The results of analysis are summarized as follows: with increase in fertility of the red soils, the amount of O-P, Al-P, Fe-P and Ca-P in the soils and their complexes of the same particle size decreased. The inorganic phosphates involved were mainly of the size <5 μm. Their amount decreased rapidly, when the particle size in the complexes increased. Increasing the fertility of red soils may rapidly augment the amount of Al-P, and improve the supply of phosphate for plants.[KH+1.5mmD]