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The effect of fire frequency on the organic components of a basaltic soil in the kruger national park south africa


, : The effect of fire frequency on the organic components of a basaltic soil in the kruger national park south africa. South African Journal of Plant & Soil 7(4): 236-238

A study was undertaken to determine which soil organic and biological factors were responsive to burning regime. Surface soils (0-15 cm) were sampled from the plots burned annually, biennially and triennially in winter, as well as the plot protected from fire for thirty-four years, in the Nwanedzi fire trial in the Kruger National Park. The organic carbon content was one quarter higher in the protected plot than in the burned plots, where there was a gradual decrease in carbon with increasing fire frequency. Total nitrogen followed the same trend, as did the nitrogen mineralization potential. Nitrogen mineralization showed a much greater sensitivity than total nitrogen to burning frequency, and anaerobic mineralization potential was less variable than in situ mineralization. Microbial biomass was double on the unburned plot relative to the burned plots, but tended to increase with increasing fire frequency.

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Jones, C.L.; Smithers, N.L.; Scholes, M.C.; Scholes, R.J., 1990: The effects of fire frequency on the organic components of a basaltic soil in the Kruger National Park. A study was undertaken to determine which soil organic biological factors were responsive to burning regime. Surface soils (0-15 cm) were sampled from the plots burned annually, biennially and triennially in winter, as well as the plot protected f...

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