Abstract: The colonization of arbuscular mycorrhizal fungi (AMF) in the roots and rhizosphere soils of rare species Magnolia cylindrica sampled from its native and cultivation habitats was examined by the methods of alkaline lysising and acid fuchsin staining. All the M. cylindrica root samples were found be colonized by AMF and formed typical Paris-type AM. The AMF colonization in the root samples from native habitat was higher than that from cultivation habitat. Five genera and 22 species of AMF were isolated and identified from the rhizosphere soils by wet-sieving, and the similarity coefficient of AMF community between the two sampling sites was 096. The spore density of AMF was higher in the native habitat than in the cultivation habitat, but the reverse result was showed on Shannon-Wiener diversity index. It was suggested that the planting of M. cylindrica might not induce a great change in the community composition of AMF in rhizosphere soil.

Key words: 　Cotton, Blossing and boll-forming stages, Shading, Fiber Quality