3种植物对重金属富集能力的比较

Comparison to Adsorptive Ability of the Heavy Metals by Three Plants

以菖蒲(Acorus calamusLinn.)、金叶菖蒲(Acorus gramineus‘Ogon’)和散尾葵(Chrysalido-carpus lutescensH.Wendl)为试验材料,将3种植物定植于人工配置的Cu、Zn、Cr和Pb复合型污染的土壤,研究不同植物对土壤中重金属的富集能力。结果表明:3种植物根部具有较强的吸收与富集作用,除Zn外,其他三种元素在根中的含量要大于茎叶中的含量,表明根系对Cu、Cr和Pb的滞留能力较强;3种植物对Zn的吸收量最大、吸收速率比较高,而对Pb的吸收量最少、吸收速率比较低,表明这3种植物对Zn污染的土壤净化效果最为明显,而对Pb污染土壤净化效果较差。

Chrysalidocarpus lutescens H. Wendl, Acorus calamus Linn. and Acorus gramineus ＇Ogon＇ were used to investigate the enrichment capacity of the different plants on heavy metals in soil via putting the above three plants into the soil treated by the artificial heavy metals such as Cu,Zn,Cr and Pb. The results showed that the roots of three kinds of plants had a higher capability to accumulate Cu, Cr and Pb than their stems and leaves except Zn. Meanwhile, it was also found that three kinds of plants all had the highest capability and absorption rate to accumulating Zn, while the least absorption amount and rate for Pb. Therefore, it was showed that these three kinds of plants had the most effective for repairing the soil polluted by Zn and were not a good choice for the soil contaminated by Pb.