西天目山金钱松树轮中五种金属元素的含量分析

Analyses of five metallic element concentrations in tree-ring of Pseudolarix kaempferi Gord. in Tianmu Mountain

本文报道西天目山金钱松(Pseudolarix kaempferi Cord.)木质部中铝、铁、钙、锰、锌5种元素含量和累积量自1711年以来的变化情况。1711～1900年期间,钙的含量(μg/g)明显增大,铁和锰稍有上升,而铝和锌则略有下降;最近25年来,铝、铁、锰元素的含量升高,而锌含量下降。1711～1900年期间,5种元素的累积量(μg/Yr)都轻微下降,但最近20～25年来,铁、铝、锰的累积量又明显上升,锌元素变化不大。笔者认为铝、铁、钙、锰、锌元素在1711～1900年出现下降,可能是由于植被遭破坏的缘故,而在近25年中,铝、铁、锰元素的急速上升,则可能是工业污染的结果。

The concentrations and accumulations of Al, Ca, Fe, Mn and Zn in the xylem of Psendolarix kaempferi Gord. in Tianmu Mountain, Zhcjiang Province, P. R. C. , since 1711, are reported in this paper. The concentration (?g/g) of Ca increased greatly and that of Al and Zn declined slightly, and that of Fe and Mn increased slightly from 171 1 to 1900. The concentrations of Al, Fe and Mn increased, but that of Zn declined in the last 25 years. The accumulations (?g/g) of the five elements declined slightly from 1711 to about 1900, which might be caused by vegetation destruction. The accumulations of Al. Fe, Mn and Ca arc increasing but the accumulation of Zn has remained generally constant since about 1965, which seems to be the results of the industrial pollution. The causes of variations in growth and elemental concentrations of Pseudalarix kaempferi Gord. have also been discussed.