Abstract:
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Objective 】 To explore the absorption and accumulation law of heavy metal elements Cr, Pb and Cd in various organs of
Picea koraiensis in the hope of providing a theoretical basis for further study on the accumulation mechanism of heavy metal elements in
Picea koraiensis. 【
Method 】The contents of Cr, Pb and Cd in different organs (including leaves, branches, bark and roots) of
Picea koraiensis near expressway (pollution point) and school road (control point) were determined by Inductively Coupled Plasma Optical Emission Spectrometer. The accumulation and pollution index of three heavy metals in organs of
Picea koraiensis and their distribution ratio were also analyzed. 【
Result 】The cumulative amount and pollution index and their distribution ratio of three heavy metals in pollution point varied significantly with organs and elements. In general, the contents of heavy metal elements in the organs of the pollution point were higher than those of the control points and the difference was significant (
P<0.05);The content of heavy metal elements in each organ was: Cr>Pb>Cd; There were differences in the contents of heavy metals in different organs, Pb and Cr were the highest in the bark, and Cd was the highest in the roots. The accumulation of heavy metal elements and their distribution ratio: Pb was the highest in the bark, Cd was the highest in the branches (facing the expressway), and Cr was the highest in the leaves (facing the expressway). Heavy metal pollution index and its distribution ratio: Pb and Cr were highest in leaves (back to expressway), and Cd was highest in branches (facing expressway).【
Conclusion 】 The results showed that all organs of
Picea koraiensis had a certain ability to absorb heavy metals, and the ability of bark and leaf to absorb heavy metals was obviously higher than other organs.