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Article

Patchy Fires Promote Regeneration of Longleaf Pine (Pinus palustris Mill.) in Pine Savannas

1
Tall Timbers Research Station, Tallahassee, FL 32312, USA
2
Department of Biological Sciences, Louisiana State University, Baton Rouge, LA 70803, USA
3
School of Forestry and Environmental Studies, Yale University, New Haven, CT 06511, USA
*
Author to whom correspondence should be addressed.
Forests 2019, 10(5), 367; https://doi.org/10.3390/f10050367
Received: 6 March 2019 / Revised: 19 April 2019 / Accepted: 24 April 2019 / Published: 28 April 2019
(This article belongs to the Special Issue Longleaf Pine)
Research Highlights: Spatial patterns of fire spread and severity influence survival of juvenile pines in longleaf pine savannas. Small areas that do not burn during frequent fires facilitate formation of patches of even-aged longleaf pine juveniles. These regeneration patches are especially associated with inner portions of openings (gaps) and where canopy trees have died in recent decades. Patterns of prescribed fire can thus have an important influence on stand dynamics of the dominant tree in pine savannas. Background and Objectives: Savannas are characterized by bottlenecks to tree regeneration. In pine savannas, longleaf pine is noted for recruitment in discrete clusters located within gaps away from canopy trees. Various mechanisms promoting this pattern have been hypothesized: light limitations, soil moisture, soil nutrients, pine needle mulching, competition with canopy tree roots, and fire severity associated with pine needle litter. We tested the hypothesis that regeneration patches are associated with areas that remain unburned during some prescribed fires, as mediated by gaps in the canopy, especially inner portions of gaps, and areas re-opened by death of canopy trees. Materials and Methods: We mapped areas that were unburned during prescribed fires applied at 1–2 year intervals from 2005–2018 in an old-growth pine savanna in Georgia, USA. We compared the maps to locations of longleaf pine juveniles (<1.5 m height) measured in 2018 and canopy cover and canopy tree deaths using a long-term (40 year) tree census. Results: Logistic regression analysis showed juveniles to be associated with unburned areas, gaps, inner gaps, and areas where canopy trees died. Conclusions: Patterns of fire spread and severity limit survival of longleaf pine juveniles to patches away from canopy trees, especially where canopy trees have died in recent decades. These processes contribute to a buffering mechanism that maintains the savanna structure and prevents transition to closed canopy forest or open grassland communities. View Full-Text
Keywords: regeneration niche; tree population dynamics; fire effects; prescribed fire regime; regeneration bottlenecks regeneration niche; tree population dynamics; fire effects; prescribed fire regime; regeneration bottlenecks
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MDPI and ACS Style

Robertson, K.M.; Platt, W.J.; Faires, C.E. Patchy Fires Promote Regeneration of Longleaf Pine (Pinus palustris Mill.) in Pine Savannas. Forests 2019, 10, 367. https://doi.org/10.3390/f10050367

AMA Style

Robertson KM, Platt WJ, Faires CE. Patchy Fires Promote Regeneration of Longleaf Pine (Pinus palustris Mill.) in Pine Savannas. Forests. 2019; 10(5):367. https://doi.org/10.3390/f10050367

Chicago/Turabian Style

Robertson, Kevin M., William J. Platt, and Charles E. Faires. 2019. "Patchy Fires Promote Regeneration of Longleaf Pine (Pinus palustris Mill.) in Pine Savannas" Forests 10, no. 5: 367. https://doi.org/10.3390/f10050367

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