土壤中某些真菌通过其菌丝体包围林木根表或侵入根组织,与林木形成共生关系。这种共生体称菌根,与林木共生的真菌叫菌根菌。一、菌根的类型1.外生菌根:外生菌根是真菌菌丝在幼根表面形成菌套,包围着根部,由菌套长出菌丝侵入根外皮层的细胞间隙,这种菌根无根毛,由包围根部的真菌菌丝 Some fungi in the soil surround the forest root surface or invade the root tissue through their mycelium, forming a symbiotic relationship with the forest tree. This symbiont called mycorrhizal, symbiotic fungus with mycorrhizal fungi. First, the type of mycorrhizae 1. Ectomycorrhiza: Ectomycorrhizal fungi mycelium is formed in the root surface of the fungus, surrounded by the roots, the bacteria grow mycelium invasion of the root cortical cell gap, this Mycorrhizal rootless hair, surrounded by fungal mycelium root