<p>Alterations to the fire regime have contributed to widespread regeneration failure in oak (<i>Quercus</i>) forests of the eastern United States. Our long-term study was initiated in 2010 in southern Indiana to examine how oak reproduction in a dry oak forest responded to shelterwood and midstory treatments followed by a spring prescribed burn. We tracked the survival, height, and resprout response of individual seedlings through time, and tallied overall seedling density pre- and post-treatments. Mixed-effects models and nonmetric multidimensional scaling (NMDS) ordination were used to evaluate post-treatment response in 2020 and 2021. Following the burn, monitored oak seedlings had greater survival (&gt; 94%) and resprouting (&gt; 92%) than most competing species, including maple species (<i>Acer</i> spp. ~ 59% survival and resprouting) and white ash (<i>Fraxinus americana</i>; 72% survival and resprouting). White oak (<i>Q. alba</i>) doubled in seedling density after burning and was one of the most abundant species (9,864 stems ha<sup>−1</sup>) in the regeneration stratum. NMDS ordination indicated that the burn promoted a shift away from mesophytic species towards greater importance of oak species. A shelterwood treatment, followed by single prescribed burn, at our study site has likely produced adequate density of oak reproduction to ensure future dominance by the genus, particularly on less-productive south-facing slopes.</p>

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Regeneration Response to Shelterwood-Burn Treatments in a Dry Oak-Dominated Forest

  • Sarah J. Rademacher,
  • Daniel C. Dey,
  • John M. Kabrick,
  • Robert W. E. Quackenbush,
  • Michael R. Saunders,
  • J. Travis Swaim,
  • Christopher D. Thornton,
  • Michael A. Jenkins

摘要

Alterations to the fire regime have contributed to widespread regeneration failure in oak (Quercus) forests of the eastern United States. Our long-term study was initiated in 2010 in southern Indiana to examine how oak reproduction in a dry oak forest responded to shelterwood and midstory treatments followed by a spring prescribed burn. We tracked the survival, height, and resprout response of individual seedlings through time, and tallied overall seedling density pre- and post-treatments. Mixed-effects models and nonmetric multidimensional scaling (NMDS) ordination were used to evaluate post-treatment response in 2020 and 2021. Following the burn, monitored oak seedlings had greater survival (> 94%) and resprouting (> 92%) than most competing species, including maple species (Acer spp. ~ 59% survival and resprouting) and white ash (Fraxinus americana; 72% survival and resprouting). White oak (Q. alba) doubled in seedling density after burning and was one of the most abundant species (9,864 stems ha−1) in the regeneration stratum. NMDS ordination indicated that the burn promoted a shift away from mesophytic species towards greater importance of oak species. A shelterwood treatment, followed by single prescribed burn, at our study site has likely produced adequate density of oak reproduction to ensure future dominance by the genus, particularly on less-productive south-facing slopes.