树木年轮对大气污染历史过程的指示作用

STUDY ON THE BIO INDICATING AIR POLLUTION HISTORY BYTREE RINGS

本文利用油松年轮揭示了承德市向１７６０年以来大气ＳＯ＿２污染过程，结果认为：油松年轮内的硫自４４．４μｇｇ￣（－１）上升到最近１０年来的４２０．７μｇｇ￣（－１），从而揭示出大气中的ＳＯ＿２浓度从０．１μｇｍ￣（－３）上升到目前的＞３０μｇｍ￣（－３），增加了近３００倍。这一过程与承德市城市化，尤其是工业化过程密切相关。

The air pollution history of SO_2 since 1800 in Chengde City wasstudied by analyzing the concentration of S in the growth rings of Pinus tabu-laeformis.The results showed that the S concentration in the tree rings haveincreased 10 times from 1910 to 1990.It indicated that the concentration ofatmospheric SO_2 of the city has increased from the beginning of urbanization.We estimated that atmospheric SO_2 concentraion in Chengde has increasedfrom the preindustrial background of less than 0.1μgm￣(-3)up to the present day,30μgm￣(-3)(P<0.001).This is described to the result of urbanization, especiallythe appearance and aggravation of industrialization in the city of Chengdesince 1950s.