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利用树木年轮环境学分析方法,测定了伊春西林铅锌矿附近兴安落叶松年轮中Pb、Cd、Zn、Cu、Mn5种重金属元素含量的变化.结果表明:在矿区附近的兴安落叶松年轮中,Mn含量最高,Cd含量最低.近地面处年轮中的Cd、Zn、Cu含量显著高于胸高处,而近地面和胸高处的Pb和Mn含量差异不显著.1987—2010年,除Pb含量有轻微上升外,其他4种元素含量均呈下降趋势,其中Cd含量下降趋势最明显,Zn、Cu、Mn含量均先下降后上升.随着兴安落叶松年轮宽度的增加,Pb含量下降,其他4种元素含量均增加.近地面处Pb含量与其他4种元素含量呈显著正相关,而在胸高处的相关性不显著,Cd含量甚至随Pb含量增加而显著下降.兴安落叶松年轮中重金属元素含量变化受铅锌矿产量和采矿活动的影响,可利用年轮中Pb含量重建采矿历史.目前,Pb含量已经对周围环境造成污染,如果继续开采,应加强对尾矿中重金属元素的治理.
The change of heavy metal elements contents of Pb, Cd, Zn, Cu and Mn in the annual rings of Larix gmelinii, Larix gmelinii, near Xiling, Xichun, Yichun was measured by using tree ring environmental analysis method.The results showed that: In the annual rings, the content of Mn is the highest and the content of Cd is the lowest.The contents of Cd, Zn and Cu in the annual rings near the ground are significantly higher than those in the thorax, while the contents of Pb and Mn in the near-surface and the thorax are not significant. , With the exception of Pb content slightly increased, the other four elements showed a downward trend, of which the most obvious decline in Cd content, Zn, Cu, Mn content first decreased and then increased.With the growth of Larix gmelinii ring width, Pb content decreased while the content of other four elements increased.The content of Pb in the near surface was positively correlated with the content of the other four elements while the correlation was not significant at the height of thymus and the content of Cd even decreased significantly with the increase of Pb content. The content of heavy metals in the annual rings of Larix gmelinii is affected by the output of lead-zinc ore and the mining activity, and the Pb content in the annual rings can be used to reconstruct the mining history. At present, the Pb content has polluted the surrounding environment and should be strengthened if the mining is continued Mine heavy metals Elements of governance.