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<p>This study evaluated the short-term responses of soil chemical, biochemical, and microbiological variables to a mid-dry season fire and its effect at the onset of the rainy season in tropical secondary savannas. Topsoil samples (0–2 and 2–5&#xa0;cm) were collected 10 days after a low-intensity fire and 10 days after the start of the rainy season from burnt and unburnt plots. Microbial biomass carbon increased as a consequence of fire but vanished at the onset of the rainy season. Dehydrogenase activity, respiration, and multi-enzyme processes such as fluorescein diacetate hydrolysis and arginine ammonification rates were not enhanced after fire in relation to unburnt sites, and this trend did not vary with the arrival of rains. Beta-glucosidase and urease activities showed that biochemical properties explain the biggest changes observed in comparison with the chemical properties measured. Finally, the multivariate approach exhibited that biochemical and microbiological parameters are more sensitive to discriminating against fire impacts on soil than chemical variables alone.</p>

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Soil enzymatic activities and microbial biomass dynamics track functional resilience after mid-dry season fires in a tropical secondary montane savanna

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Francisco F. Herrera,
  • Saúl Flores

摘要

This study evaluated the short-term responses of soil chemical, biochemical, and microbiological variables to a mid-dry season fire and its effect at the onset of the rainy season in tropical secondary savannas. Topsoil samples (0–2 and 2–5 cm) were collected 10 days after a low-intensity fire and 10 days after the start of the rainy season from burnt and unburnt plots. Microbial biomass carbon increased as a consequence of fire but vanished at the onset of the rainy season. Dehydrogenase activity, respiration, and multi-enzyme processes such as fluorescein diacetate hydrolysis and arginine ammonification rates were not enhanced after fire in relation to unburnt sites, and this trend did not vary with the arrival of rains. Beta-glucosidase and urease activities showed that biochemical properties explain the biggest changes observed in comparison with the chemical properties measured. Finally, the multivariate approach exhibited that biochemical and microbiological parameters are more sensitive to discriminating against fire impacts on soil than chemical variables alone.