Abstract
Dynamics of N2-fixing bacteria such as Rhizobium, Azospirillum and Azotobactor, nodule number in the dominant legume Atylosia trinervia and P-solubilizing bacteria, actinomycetes and fungi were determined for two years in unburned and burned sites of a natural grassland, southern India. Populations of all Nz-fixing bacteria and nodule number in the dominant legume Atylosia trinervia significantly increased in burned sites. P-solubilizing bacterial and fungal populations were also increased significantly by surface fire but actinomycete population remained unaltered. Thirty six species of fungi were recorded with tricalcium phosphate solubilizing ability. The population densities varied between sites according to individual species. The burned site recorded significantly higher fungal propagules than unburned site. The most efficient P-solubilizing fungi were Absidia ramosa, Gongronella butlerii, Mortierella spinosa, Mucor racemosus, Rhizopus nigricans, R. stolonifer, R. oryzae, Aspergillus furnigatus, A. nidulans, A. niger, Thielavia terricola and Cheatomium lunasporium.
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