菖蒲和芦苇对复合重金属胁迫的生理反应及其富集能力

研究了水生植物菖蒲和芦苇对复合重金属(V、Cr和Cd)的富集能力及对重金属的生理响应,以考察这两种植物对重金属污染水体的修复效果.结果表明,随着水体中重金属污染浓度的提高,两种植物的耐性系数均有所下降,但菖蒲的生长状况优于芦苇.在不同重金属污染浓度下,菖蒲和芦苇均表现出对Cd的富集能力最强,其次是Cr,而对V的富集能力相对较弱.在相同重金属浓度下,菖蒲对三种重金属的富集总量大于芦苇,在重金属质量浓度为15mg·L-1时,菖蒲对三种重金属的富集量分别是1065.02、1754.80和4372.40mg·kg-1,且菖蒲地下部分对V、Cr和Cd的富集系数分别是芦苇的2.1倍、1.5倍和1.8倍.综合考虑得出菖蒲比芦苇更适用于V、Cr和Cd复合重金属污染的修复.

Physiological responses of Acorus calamus and reed under composite heavy metal stress and their enrichment ability

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 15mg·L-1, the enrichment of three heavy metals by Acorus calamus is 1065.02, 1754.80 and 4372.40mg·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.