不同蒿类植物对重金属锌的积累特性

为建立人工湿地生态系统修复土壤重金属污染的植物种类提供参考,以潼关县黄金生产区及附近不同地区生长的6种蒿类植物(叉枝蒿、青蒿、水蒿、茵陈蒿、莳萝蒿和艾蒿)为研究对象,测定并分析蒿类植物体内的锌(Zn)含量。结果表明:同种植物对Zn的吸收能力随着根际土壤中Zn含量的增加而增加。9个样地6种植物中,莳萝蒿对Zn的富集能力最强,富集系数为2.44,转移系数为1.97,Zn主要富集在植物叶片中;叉枝蒿和青蒿的转移系数和富集系数均大于1,艾蒿和茵陈蒿的富集系数分别为0.35和0.34,富集能力较弱。莳萝蒿是建立人工生态系统富集重金属Zn的首选植物,其次是叉枝蒿和青蒿。

Study on the Accumulation Property of Zn in Different Artemisia Plants

In order to provide reference for the establishment of artificial wetland ecosystem repairing the plant species of heavy metal contaminated soil,six kinds of Artemisia plants was chosen as subject investigated around the golden mineral at Tongguan county,including Artemisia divaricata,Artemisia annua L.,Artemisia selengensis,Artemisia capillaries,Artemisia anethoides and Artemisia argyi,to determine the content of heavy metal Zn in different artemisia plants.The results were as following: the absorbing capacity for the same plant increased with the increasing of Zn content.Among six kinds of plants in nine different places,the Artemisia anethoides Mattf.had the best absorbing capacity to Zn,the concentration coefficients was 2.44 and transfer coefficients was 1.97,and Zn was mostly stored in plant leaves.The concentration coefficients and transfer coefficients of Artemisia divaricata and Artemisia annua were all greater than 1.The concentration coefficient of Artemisia argyi was 0.35 and Artemisia capillaries was 0.34 and they had the weaker absorbing capacity to Zn than others.So to establish the artificial eco-system,the Artemisia anethoides was the first choice to enrich the heavy metal Zn,and then was the Artemisia divaricata and the Artemisia annua.