Physiological responses of Acorus calamus and reed under composite heavy metal stress and their enrichment ability
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摘要: 研究了水生植物菖蒲和蘆葦對復合重金屬(V、Cr和Cd)的富集能力及對重金屬的生理響應,以考察這兩種植物對重金屬污染水體的修復效果.結果表明,隨著水體中重金屬污染濃度的提高,兩種植物的耐性系數均有所下降,但菖蒲的生長狀況優于蘆葦.在不同重金屬污染濃度下,菖蒲和蘆葦均表現出對Cd的富集能力最強,其次是Cr,而對V的富集能力相對較弱.在相同重金屬濃度下,菖蒲對三種重金屬的富集總量大于蘆葦,在重金屬質量濃度為15 mg·L-1時,菖蒲對三種重金屬的富集量分別是1065.02、1754.80和4372.40 mg·kg-1,且菖蒲地下部分對V、Cr和Cd的富集系數分別是蘆葦的2.1倍、1.5倍和1.8倍.綜合考慮得出菖蒲比蘆葦更適用于V、Cr和Cd復合重金屬污染的修復.Abstract: It was studied that the aquatic plant Acorus calamus and reed affected the enrichment ability of compound heavy metals (i. e. V, Cr and Cd) and physiological response and the two plants repair effects of polluted water were investigated by heavy metals. Results show that the tolerance index of two plants decreases with heavy metals concentration increasing in water body, whereas the growth of the Acorus calamus is better than that of reed. Under different concentrations of heavy metals, both Acorus calamus and reed show the strongest enrichment ability of Cd, followed by Cr, while the enrichment ability of V is relatively weak. Under same heavy metal concentration, Acorus calamus on the total enrichment quantities of three kinds of heavy metals are better than those of reed. When the mass concentration of heavy metal is 15 mg·L-1, the enrichment of three heavy metals by Acorus calamus is 1065.02, 1754.80 and 4372.40 mg·kg-1 for V, Cr and Cd, respectively. The enrichment index of Acorus calamus underground part of V, Cr and Cd is 2.1, 1.5 and 1.8 times better than that of reed. It is concluded that Acorus calamus is more suitable for the remediation of heavy metal pollution by V, Cr and Cd.
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Key words:
- composite heavy metal pollution /
- Acorus calamus /
- reed /
- physiological response /
- enrichment ability
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參考文獻
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