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Three burning regime (fire protected, early burning, late burning) and their effects on plant biomass and species diversity in Dabagi forest Reserve of Sokoto State were investigated. Prescribed burning was carried out on randomly selected plots (10 m x 10 m) in November (early burn) and March (late burn) 2004. The design of experiment was a Randomized Complete Block Design (RCBD) and the burning treatments were replicated three times. The data obtained were analyzed using analysis of variance. The diversity index of the shrubs species was higher (P though the species richness index in the late burnt plot (d = 3.31) was higher than that of the early burnt plot (d=2.50). Species evenness index was higher (P plot (E=0.92), indicating that the shrub species in the early burnt plot shows greater uniformity in the distribution of individual among the taxa, hence the higher species diversity. Similarly for forbs and grasses, the diversity index was higher in the early burnt plot (H1=0.89) while it was least in the late burnt plot (H1=0.83). The grass species biomass (g/m2) production were higher in the early burnt plots than in the late burnt plot during the nine-month post fire sampling period, while late burning initiated higher forbs biomass than the biomass of grasses throughout the nine-month post fire period. Key words: Burning regime, evenness, indices, richness and species.

Prescribed burning and its effect on plant biomass and species diversity in savanna ecosystem, Sokoto, Nigeria