Characteristics of heavy metal enrichment efficiency in different organs of urban green tree Cinnamomum camphora.

doi:10.13287/j.1001-9332.201709.010

Abstract

Abstract: The objective of this study was to explore the enrichment efficiency of heavy metals in Cinnamomum camphora organs under soil heavy metal concentration and pollution gradients. The compartments of the organs were leaf, branch, trunk, and rhizosphere soils, while the heavy metals under investigation were Cu, Zn, Pb, Cr, Mn and Ni. The results showed that the concentration of heavy metals was significantly different by organs, types of heavy metals, and concentration of rhizosphere soil heavy metals. Heavy metal concentration in leaf and branch followed the order of Mn ＞ Zn ＞ Cu ＞ Cr ＞ Pb ＞ Ni, while in trunks it followed the order of Mn ＞ Zn ＞ Cr ＞ Pb ＞ Ni ＞ Cu. The enrichment coefficient of Mn in leaf had the maximum of 2.409, and that of Ni in trunk was 7.6 and 16 times higher than that in leaf and branch, respectively. In addition, the enrichment coefficients of Cu, Zn, Pb, Cr and Ni in the truck were much higher than the other organs under diffe-rent soil heavy metal concentration gradients. The heavy metal enrichment capacities of Cu, Zn, Pb, Cr, Mn and Ni followed the order of leaf ＞ trunk ＞ branch. As the pollution gradient increased, the heavy metal enrichment coefficient decreased gradually. The heavy metal enrichment efficiency of C. camphora (DBH=22 cm) followed the order of leaf ＞ trunk ＞ branch, and the enrichment of Cu, Zn, Pb, Cr and Ni in trunk was significantly higher than in the other organs. The study showed that the C. camphora had a certain enrichment capacity to absorb heavy metals of Cu, Zn, Pb, Cr, Mn and Ni in soils. The enrichment efficiency of Pb and Ni in trunk was significantly higher than the other organs, which accounted for 82.7% and 91.9% of the total accumulation. Thus, C. camphora has the potential to be an alternative option in phytoremediation of heavy metal contaminated soils.

CHE Ji-lu, YU Shu-quan, LIU Hui, QIU Wen-xin, WEN Ya-ting. Characteristics of heavy metal enrichment efficiency in different organs of urban green tree Cinnamomum camphora.[J]. Chinese Journal of Applied Ecology, 2017, 28(9): 2907-2916.

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