1994年在南京市太平门街道采集了五株雪松的年轮样及其根部土壤(黄棕壤pH=6.68),分别测定了Li、Al、P、K、Mn、Co、Cu、Zn、Cd、Ba和Pb等11种化学元素含量,实测结果验证了雪松年轮与其根部当年土壤中化学元素含量满足对数线性相关模式;lgC’(Z,t)=a(Z)+b(Z)lgC(Z,t).根据年轮元素含量C(Z,t)可以重建过去根土中元素含量C’(Z,t),即反映环境(土壤)中元素含量的逐年演变的年份序列。利用C(Z,t)中最低含量可估算该地段黄棕壤的土壤元素背景值。

Five Cedrus deodara (Roxb.) G. Don. trees growing in Taipingmen Street, Nanjing City (yellow brown soil pH=6.68), were selected to determine the contents of 11 chemical elements (Li, Al, P, K, Mn, Co, Cu, Zn, Cd, Ba and Pb) both in the 1994’s growth rings, C(Z,t), and in the soils near the roots, C’(Z,t) of trees. The results showed that the relationship between C(Z,t) and C’(Z,t) followed the logarithmic linear correlation model, lgC’(Z,t)=a(Z)+b(Z)lgC(Z,t). Based on this model the chrono sequences of chemical element contents in the soils were reproduced from those in the tree rings; i.e., the dynamic variations in the chemical element contents of the soils at the sites were traced. The background values of chemical elements in the soil were calculated by taking the lowest values of the chrono sequences of the element contents in tree rings.