Distribution and migration characteristics of heavy metals in three generations of Casuarina equisetifolia forest system

Distribution and migration characteristics of heavy metals in three generations of Casuarina equisetifolia ecological forest system were studied in Hainan Island. The result showed that, the sequence of content of heavy metals in coastal sandy was Cu>Zn>Pb>Ni>As>Cd, contents of heavy metals were different in different parts of three generations of C. equisetifolia plants, the content of heavy metal of the overground higher than that of the underground in C. equisetifolia plants, and the conce灶trations of Zn, Cu, Pb were in the top three. The enrichment ability of all generations of C. equisetifolia on Cd was far stronger than other heavy metals, the enrichment coefficients of Cd of the first, second and third C. equisetifolia were 13.1269, 7.0090 and 10.8176, respectively. The content of Zn in all generations of C. equisetifolia was far higher than other heavy metals, the migration coefficients of Zn of the first, second and third C. equisetifolia were 2.0946, 1.7105 and 3.9634, the enrichment coefficients of Zn were 3.6745, 1.9651 and 5.7165, respectively.