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<p>Forest fires are major disturbances that can have a significant impact on forest structure, species diversity and regeneration potential, which is poorly understood in tropical dry forests. The present study was conducted in a tropical dry deciduous forest of Similipal Biosphere Reserve (SBR), Eastern India to know how a forest fire event affects on species diversity and regeneration potential. Normalized burn ratio (NBR) and differenced normalized burn ratio (dNBR) were estimated to understand the overall effect of forest fire and post fire regrowth in SBR. Permanent plotting (50&#xa0;m × 20&#xa0;m) was employed to track the changes in burned and unburned forest plots. The comparative NBR between pre and post-fire conditions showed most of the area in SBR under moderately affected (highest frequency of pixel values near − 0.28) by the fire. The results of the study found that seedling and sapling diversity and density increased linearly in burned forest plots after the fire event in respect to time. The result was well supported by the NBR and dNBR indices. The severity of the fire was low to moderate (dNBR between 0.10 and 0.27). The highest intensity of pixel value of dNBR between − 0.10 to − 0.20 indicated good vegetation regrowth after 6&#xa0;months of fire. Tree species had good regeneration potential (65.38%) in burned forest plots, whereas it was fair in unburned forest plots (60.0%) indicating less interspecific competition in the former. ANOVA study revealed that, there was no significant difference observed in sapling (mean difference = 0.99, <i>p</i> = 0.33) and seedling (mean difference = 0.07,  p= 0.79) diversity index value between burned and unburned forest plots. The most fire-tolerant species found were <i>Shorea robusta</i>, <i>Croton persimilis</i>, <i>Cleistanthus collinus</i>, <i>Xylia xylocarpa</i>, <i>Mallotus philippensis,</i> and <i>Pterospermum xylocarpum</i>. Our findings explored that the tropical dry forests have very high resilience, adaptive mechanisms and faster recovery rate to a single fire event in terms of species diversity and regeneration.</p>

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Species diversity and regeneration largely unaffected by forest fire in tropical dry forests of Eastern India

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Manas R. Mohanta,
  • Gour C. Samal,
  • Mukunda D. Behera,
  • Sudam C. Sahu

摘要

Forest fires are major disturbances that can have a significant impact on forest structure, species diversity and regeneration potential, which is poorly understood in tropical dry forests. The present study was conducted in a tropical dry deciduous forest of Similipal Biosphere Reserve (SBR), Eastern India to know how a forest fire event affects on species diversity and regeneration potential. Normalized burn ratio (NBR) and differenced normalized burn ratio (dNBR) were estimated to understand the overall effect of forest fire and post fire regrowth in SBR. Permanent plotting (50 m × 20 m) was employed to track the changes in burned and unburned forest plots. The comparative NBR between pre and post-fire conditions showed most of the area in SBR under moderately affected (highest frequency of pixel values near − 0.28) by the fire. The results of the study found that seedling and sapling diversity and density increased linearly in burned forest plots after the fire event in respect to time. The result was well supported by the NBR and dNBR indices. The severity of the fire was low to moderate (dNBR between 0.10 and 0.27). The highest intensity of pixel value of dNBR between − 0.10 to − 0.20 indicated good vegetation regrowth after 6 months of fire. Tree species had good regeneration potential (65.38%) in burned forest plots, whereas it was fair in unburned forest plots (60.0%) indicating less interspecific competition in the former. ANOVA study revealed that, there was no significant difference observed in sapling (mean difference = 0.99, p = 0.33) and seedling (mean difference = 0.07,  p= 0.79) diversity index value between burned and unburned forest plots. The most fire-tolerant species found were Shorea robusta, Croton persimilis, Cleistanthus collinus, Xylia xylocarpa, Mallotus philippensis, and Pterospermum xylocarpum. Our findings explored that the tropical dry forests have very high resilience, adaptive mechanisms and faster recovery rate to a single fire event in terms of species diversity and regeneration.