城市绿化树种香樟不同器官对土壤重金属的富集特征

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为了了解不同土壤重金属浓度梯度及污染梯度下香樟不同器官的富集特征,测定了香樟树叶、树枝、树干和根际土壤中6种重金属元素(Cu、Zn、Pb、Cr、Mn、Ni)的含量.结果表明:香樟地上部分重金属含量因器官、元素种类、根际土壤重金属浓度的不同而存在差异.香樟树叶和树枝重金属含量的大小顺序均为:Mn>Zn>Cu>Cr>Pb>Ni,树干重金属含量为:Mn>Zn>Cr>Pb>Ni>Cu.树叶对Mn的富集系数较高,为2.409;树干对Ni的富集系数较高,分别为树叶、树枝的8.6和17倍,且在不同土壤重金属浓度梯度下,香樟树干对Cu、Zn、Pb、Cr、Ni的富集系数均明显高于其他器官.香樟地上部分器官对Cu、Zn、Pb、Cr、Mn、Ni 6种重金属元素的综合富集能力大小顺序为:树叶>树干>树枝.随着土壤重金属污染等级的增加,香樟地上部分各器官的富集系数均逐渐降低.研究区域平均胸径为22 cm的单株香樟对重金属元素富集效能的大小顺序为:树叶>树干>树枝,其中树干对Cu、Zn、Pb、Cr、Ni的积累量均显著高于树叶和树枝.表明香樟对6种重金属元素均有一定的富集能力,并且树干对Pb和Ni的富集效能明显,分别占地上部分总积累量的82.7%和91.9%,能很好地富集并稳固土壤中的Pb和Ni,可作为修复治理土壤重金属污染的备选树种. In order to understand the enrichment characteristics of different organs of camphora in different soil concentration gradients and pollution gradients, the contents of six heavy metal elements (Cu, Zn, Pb, Cr, Mn and Ni) in camphor tree leaves, branches, trunk and rhizosphere soil The results showed that the contents of heavy metals in aerial part of camphora were different due to different organ and elemental species and heavy metal concentrations in rhizosphere soil.The content order of heavy metals in leaves and branches of camphor was Mn> Zn> Cu> Cr > Pb> Ni. The contents of heavy metals in the trunk were Mn> Zn> Cr> Pb> Ni> Cu. The enrichment coefficient of Mn was 2.409 for leaves, and the enrichment coefficient of Ni was higher , 8.6 and 17 times higher than those of other organs, and the enrichment coefficients of camphor tree trunk to Cu, Zn, Pb, Cr and Ni were significantly higher than those of other organs under different soil heavy metal concentration gradients. , And the order of enrichment of Cr, Mn and Ni in heavy metals was as foliage> tree trunk> branch. With the increase of soil heavy metal pollution levels, the enrichment coefficients of various organs in aerial parts of Campanula gradually decreased. Cinnamomum camphora average diameter of 22 cm of heavy metal elements enrichment efficiency The order of energy was: leaf> tree trunk> tree branch, in which the accumulation of Cu, Zn, Pb, Cr and Ni in tree trunk was significantly higher than that of leaves and tree branch, indicating that camphor had certain enrichment ability for 6 kinds of heavy metal elements , And the enrichment efficiency of Pb and Ni on the trunk was obvious, accounting for 82.7% and 91.9% of the total aboveground part accumulation, respectively, which could well enrich and stabilize Pb and Ni in the soil and could be used as remediation and management of soil heavy metal pollution Alternative tree species.
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