1999年与2014年贡嘎山峨眉冷杉枝和叶中常见重金属的生物富集特征对比

发布时间：2018-05-12 14:18

本文选题：贡嘎山 + 峨眉冷杉　；参考：《环境科学》2017年07期

【摘要】：经济的快速发展使得生态环境的承载力日益接近上限,而关于偏远地区森林系统的重金属污染的时间变化趋势却鲜有报道.本文测定了贡嘎山1999年与2014年采集的峨嵋冷杉枝、叶中的Pb、Hg、Cr、As、Cd、Mn、Cu、Zn与Ba.结果表明:(1)1999年枝、叶样品中Pb、Hg、As、Cd、Mn与Cu显著高于2014年的量,而2014年枝、叶样品中Cr、Zn和Ba高于1999年的量;(2)枝中Pb、Hg、Cr、As、Cd、Mn、Cu、Zn和Ba与生长龄无统一的变化趋势,而在叶中的含量随着生长龄的增加有增加的趋势;(3)Hg易在叶中富集,而其它元素更易在枝中富集;通过在主成分分析的基础上进行多元线性回归判断常见重金属元素的来源,枝、叶中的Pb、Cr、As、Cd、Cu、Zn和Ba有42.3%~92.2%的含量来自于土壤,而枝、叶中的Hg有70.6%的含量来自于大气.这说明Hg存在与其他重金属在森林系统不同的累积机制.
[Abstract]:With the rapid development of economy, the carrying capacity of ecological environment is approaching the upper limit day by day, but there are few reports on the time variation trend of heavy metal pollution in the forest system in remote areas. In this paper, we have determined the contents of Pb-HgCG-Cr-As-CDMn-Mn-CuPn-Zn and Ba. in the leaves of Abies Emei collected in Gongga Mountain in 1999 and 2014. The results showed that the contents of PbHgHgCU, CdCU, mn and Cu in leaf samples in 1999 were significantly higher than those in 2014, while in 2014, the contents of Cr, Zn and Ba in leaf samples were higher than those in 1999, and there was no uniform trend between the growth age and the growth age. However, the content in leaves tends to increase with the increase of growth age, and the other elements are more easily enriched in branches, and the sources of common heavy metals are determined by multivariate linear regression based on principal component analysis. The contents of Pb ~ (2 +) Cr ~ (2 +) C ~ (2 +) CD ~ (2 +) Cu ~ (2 +) Zn and Ba in leaves are 42.3% and 92.2%, while in branches and leaves, 70.6% of Hg contents come from the atmosphere. This suggests that Hg has a different accumulation mechanism from other heavy metals in forest systems.
【作者单位】：中国科学院地球化学研究所环境地球化学国家重点实验室;中国科学院大学;中国科学院成都山地灾害与环境研究所山地灾害与地表过程重点实验室;贵州师范大学贵州省山地环境信息系统和生态环境保护重点实验室;
【基金】：国家重点基础研究发展规划(973)项目(2013CB430002) 国家自然科学基金项目(41430754,41471416,41173024)
【分类号】：X173

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