Abstract: An investigation was made on the arbuscular mycorrhiza (AM) and dark septate endophytes (DSE) associated with 16 common plant species belonging to 12 families in a tropical rain forest in Bawangling of Hainan Island, China. The fungi were identified by alkaline lysising and acid fuchsin staining. Among the surveyed plant species, 13 of them (occupying 81% of the total) were typically colonized by arbuscular mycorrhizal fungi (AMF), while 3 species (about 19%) did not form AM. Eleven AMF species in 3 genera were isolated from the rhizosphere soi
ls by wetsieving, of which, 3 species came from Acaulospora, 7 species from Glomus, and 1 species from Gigaspora. Glomus was the dominant genus. A. foveata was the most common species, which was found in the rhizosphere soils of 14 plant species. G. macrocarpum had the highest ability to produce spores, and its relative abundance was 59%. Eleven plant species (about 69% of the total) were found to be colonized by DSE, occupying 69% of the total; and 11 plant species were simultaneously colonized by AMF and DSE.

Key words: Cotton, Nitrogen management, Water management, Knowledge model