植物-AM真菌联合修复排污河道复合污染沉积物

摘要

针对重金属在我国排污河道底泥中大量富集的现状,进行玉米-黑麦草间作修复排污河道底泥的盆栽试验,并设置接种AM真菌的试验组,以研究植物-AM真菌在河道底泥修复过程中的作用以及真菌对河道底泥修复的辅助效果.结果表明:排污河道底泥中Zn、Cd含量严重超标,经玉米-黑麦草间作修复后情况明显好转,尤其在辅以AM真菌后,植物对Cd的吸收量显著增加,且植物对排污河道底泥的整体修复效果有所提升.底泥中重金属形态测试结果表明,玉米和黑麦草对河道底泥中的重金属元素有活化作用,但AM真菌对金属活化作用的影响不明显,仅有效促进了黑麦草对Cd元素的活化作用.重金属在植物体内不同部位的积累情况发现,AM真菌可促进金属元素由地下部分向地上部分的运输.植物-AM真菌联合修复的方法可促进沉积物中大分子有机物的降解,尤其对萘的降解效果较为明显.%Zea mays L .and Lolium multiflorum Lam were intercropped using the method of pot experiment in order to understand the effect of phytoremediation of sewage river sediment. Contrast test was performed to study the influence of AM fungi on phytoremediation.The results show that plants played a significant role in the degradation of heavy metals in sewage river sedi-ment.The inoculation of AM fungi enhanced the removal of Cd by plants,and improved phytore-mediation.AM fungi helped the plants absorb more heavy metals from sediment,but had little effect on changing the mental form except Cd.AM fungi helped the translation of heavy metal from the under-ground part of plants to the above-ground part.Plant-AM fungi combined remedi-ation is an effective way to degrade organic contaminations,and especially,the degradation of naphthalene.