The annual rings of six Masson pine trees and the soils near the tree roots were sampled from the red soil area in Jiangxi Province for the determination of Al, P, Fe,Co, Cu, Zn, and Ba contents. Results showed that the relationship between C(z,t) and C' (z, t) followed the logarithmic linear correlation model:
lgC'(Z)=a(Z)+b(Z)lgC(Z)
where z is atomic number of element, a and b are coefficients, which are related to chemical elements, tree species, climatic factor and soil types. Based on this model the dynamic changes of chemical element contents in soils could be reflected by those in the growth rings of tree.