Biodiversity of Arbuscular Mycorrhizal Associations in some forest Trees of Aagoonia, Bangladesh

Roots and rhizosphere soils of eight different tree species (Albizia odoratissima, Artocarpus chaplasha, Elaeocarpus robustus, Mangifera sylvatica, Quercus velutina, Syzygium cumini, Tectona grandis, Toona ciliata were collected from the Aagoonia forest to determine the biodiversity of arbuscular mycorrhizal (AM) colonization and AM fungal spore population. Roots of all the tree species were found colonized by AM fungi. The range of colonization varied significantly (18-83%). The highest was recorded in E. robustus (83%) followed by T. ciliata (72%), Q. velutina (62%), T. grandis (59%) M. sylvatica (50%), S. cumini (45%) and A. odoratissima (33%). The lowest was recorded A. chaplasha (18%). Vesicular colonization was recorded ranging 10-60% in six tree species. The highest was recorded E. robustus (60%) followed by T. ciliata (54%), T. grandis (40%), S. cumini (28%) and Q. velutina (20%). The lowest was A. odoratissima (10%). No vesicular colonization was recorded in A. chaplasha and M. sylvatica. Arbuscular colonization was recorded (4-30%) in six tree species. The highest was recorded T. grandis (30%) followed by Q. velutina (12%) and T. ciliata (10%). The lowest was recorded in S. cumini (4%). Arbuscular mycorrhizal fungal spore population varied significantly (120-784/100g dry soil). The highest population was recorded in the soils of T. ciliata (784) as followed by E. robustus (681), T. grandis (333), Q. velutina (285), M. sylvatica (256), A. chaplasha (210) and A. odoratissima (185).