Abstract: The characteristics of P and Zn transformations in a cinnamon soil are investigated by field micro-plot experiment and chemical fractional extraction method. It is found that Ca₂-P and Ca₈-P in this soil are the most active forms, and the circulative capacity of Ca₈-P can reach to a large amount which exceeds the Puptake of single cropping plants by more than 9-fold. Among the forms of Zn, EX-Zn and CARB-Zn are the most active forms, and the circulative capacity of CARB-Zn can also reach up to a large amount which exceeds the Zn uptake of single cropping plants by more than 19-fold. Therefore, the mechanism controlling the supply and storage of Zn and coordinating the fluctuation of soil moisture is constituted mainly by Ca₈-P and CARB-Zn pools. Enriching Ca₈-P and CARB-Zn pools by fertilization is beneficial to intensify the drought resistance by crops, to increase the use efficiency of water and nutrients, and to advance the development of sustainable agriculture in easily dived region.

Key words: Cinnamon soil, Transformation of P and Zn, Upland agriculture, potassium content, spectrum., foliar, Juglans regia