不同径级国槐行道树重金属富集效能比较

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PDF HTML阅读 XML下载 导出引用 引用提醒 不同径级国槐行道树重金属富集效能比较 DOI: 10.5846/stxb201403300592 作者: 作者单位: 中国林业科学研究院林业研究所,中国林业科学研究院林业研究所,中国林业科学研究院林业研究所,中国林业科学研究院林业研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 国家"十二五"(2011BAD38B03)科技支撑计划项目 Variation of heavy metal enrichment efficiency in roadside trees of Sophora japonica L. with different diameters at breast height Author: Affiliation: Forestry Research Institute, CAF,Forestry Research Institute, CAF,, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:采用ICP-OES测定北京市台基厂大街行道树国槐各器官中7种重金属(Cd、Cr、Ni、Cu、Mn、Pb、Zn)含量,比较不同径级国槐重金属富集效能。结果表明:国槐中重金属含量因胸径级、器官、元素种类不同而存在差异。各径级国槐重金属含量大小总体趋势为Zn > Mn > Cu > Pb > Cr > Ni > Cd,各器官中树皮和根对重金属的吸收能力最强,其次是叶和枝,树干对重金属的吸收能力最弱。不同径级国槐对重金属的富集能力存在差异,表现为小径级 > 中径级 > 大径级。国槐各器官中重金属积累量大小顺序为根 > 干 > 枝 > 叶,重金属积累量随着胸径级扩大和生物量的增加而增加。综合比较不同径级国槐重金属年均积累量、单位面积富集量和单位空间富集量,小径级(20≤DBH < 30cm)国槐富集效能最高。 Abstract:The concentration of heavy metals (Cd, Cr, Cu, Mn, Ni, Pb, Zn) in roadside tree of Sophora japonica L. and their organs along Taijichang Street was measured by using the Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES) to compare the heavy metal enrichment capacity between different diameter classes. The results showed that the concentration of heavy metals in different diameter classes of Sophora japonica L., the concentration of the same element in different organs, and the concentration of different elements in the same organ were all different. In general, heavy metal concentration in Sophora japonica L. followed the order of Zn > Mn > Cu > Pb > Cr > Ni > Cd. The heavy metal absorption capacity in all organs followed the order of bark > root > leaf > branch > stem. Meanwhile, the study showed that the enrichment capacity of Sophora japonica L. in diameter at breast height (DBH) of small size was stronger than those of medium and large size. Heavy metal accumulation in different organs followed the order of root > trunk > branch > leaf, which also increased in Sophora japonica L. with the increase of DBH and biomass. By comparing the accumulation per year, the bioenrichment unit area as well as the bioenrichment unit space of heavy metals with medium and large DBH, Sophora japonica L. of smaller DBH (DBH less than 30 cm or more than 20 cm) had higher enrichment efficiency. 参考文献 相似文献 引证文献