Received Date:2022-10-22
Download
2022 NO.06
Field experiments was carried out with four pioneer plants (Conyza canadensis (Linn.) Cronq, Nephrolepis auriculata (L.) Trimen, Stipa bungeana Trin and Polygonim minus Huds) on the abandoned zinc tailings pond in Shizhuyuan, Chenzhou. The contents of Zn and Cd in soil overground, underground and around plant roots were measured respectively. The results showed that after adding Bacillus laterosporus, the enrichment coefficient and transfer coefficient of Zn for Conyza canadensis (Linn.) Cronq were higher than those of Cd, while the enrichment coefficient and transfer coefficient of Cd for Stipa bungeana Trin were higher than those of Zn. The ability of Nephrolepis auriculata (L.) Trimen to enrich Zn was almost unchanged. When 10 g Bacillus laterosporus was added, the enrichment coefficient of Zn for Polygonim minus Huds reached a peak value of 1.6. When the addition of bacterial agent was 10 g, the ability of Nephrolepis auriculata (L.) Trimen to transfer heavy metal Cd was significantly improved, and the transfer coefficient reached 4~6 times of the original value. Except Polygonim minus Huds, the other 3 pioneer plants had a strong ability to enrich heavy metals in soil when 10~20 g Bacillus laterosporus was added. The ability of enriching and transferring heavy metals Zn and Cd was ranked as follows: Nephrolepis auriculata (L.) Trimen>Polygonim minus Huds>Stipa bungeana Trin>Conyza canadensis (Linn.) Cronq.
Close-LI Yuanyuan, SUN Jie, HAO Zhe. Effect of Bacillus laterosporus on enrichment of Zn and Cd in pioneer plants in zinc tailings[J]. Energy Environmental Protection, 2022, 36(6): 70-75.