铁尾矿直接植被恢复中丛枝菌根真菌的应用

Application of Arbuscular Mycorrhizal Fungi in Vegetation Restoration of Iron Tailings

室内盆栽条件下,研究了接种菌根真菌对铁尾矿中直接种植的紫花苜蓿的生长以及对铁尾矿环境的影响。结果表明:接种幼套球囊霉(Glomus etunicatum)可显著提高紫花苜蓿种子在铁尾矿中的出苗率、成活率;显著增加其根系干重;使植物根际尾矿中细菌数量减少、真菌和放线菌数量增加,差异达到显著水平;菌根真菌对紫花苜蓿根系具有较高的侵染率达80%以上;菌根促进了铁尾矿中磷素含量增加。不同添加水平下,以2.5%(质量比)效果最好,可以作为适宜的接种量。总之,铁尾矿中接种幼套球囊霉(Glomus etunicatum)可显著提高紫花苜蓿根系的生长,改善根际微生物区系,增加尾矿中磷素的释放,有利于尾矿的植被复垦。

With pot experiments in room,the influences of arbuscular mycorrhizal fungi on the alfalfa growth directly planted in iron tailing and the environments of iron tailings are investigated.The results show that the addition of Glomus etunicatum can greatly improve the emergency and survival rate of alfalfa in iron tailings,and significantly increase the root dry weight,leading to the reduction of bacteria and the increase of epiphytes and actinomycetes.Its difference is significant.Mycorrhizal fungi has a high infection rate of 80% or more on roots of alfalfa,which promotes iron phosphorus content increased in the tailings.Comparing with different adding level,2.5% of mass ratio is the most effective and can be used as the suitable inoculum concentration.In short,the vaccination of Glomus etunicatum in iron tailings can significantly increase the root growth of alfalfa,improve the rhizosphere microflora,and promote the release of phosphorus in the tailing,which benefit for vegetation reclamation of iron tailings.