Changes in stand structure and tree vigor with repeated prescribed fire in an Appalachian hardwood forest

Mary A. Arthur, Beth A. Blankenship, Angela Schörgendorfer, David L. Loftis, Heather D. Alexander

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


Without large scale disturbances to alter forest structure and open the canopy, historically oak-dominated forests of the central and Appalachian hardwood regions of eastern North America are shifting to dominance by shade-tolerant, 'mesophytic' species. In response, prescribed fire is applied with increasing frequency and spatial extent to decrease non-oak species and promote dominance of oak species. However, relatively few studies have examined impacts of repeated fire to forest structure and tree vigor across multiple years and varied terrain. In this study, we examined tree vigor, tree mortality, and stand structure in response to different burn treatments: Frequent (burned 4 times in eight years), Less Frequent (burned 2 times in eight years), and Fire-Excluded. We hypothesized that fire-driven decreases in stem density and basal area would be greatest for small size classes, especially of shade-tolerant species on drier landscape positions, and would increase with burn frequency and fire temperature. We expected trees surviving fire to exhibit increased crown vigor over time since fire. Prescribed fire effects depended on tree size-class and landscape position. About 60% of surviving midstory trees (10-20. cm diameter at breast height (DBH)) and 25% of overstory trees (≥20. cm DBH) on sub-xeric and intermediate landscape positions experienced crown dieback. Fire-Excluded sites had fewer trees with crown dieback (11-28% across size classes) compared to burned sites (21-87%). Throughout the duration of the study, midstory and overstory maples had significantly greater likelihood of increased crown dieback compared to oaks. Paradoxically, midstory maples had a higher survival probability than similarly-sized oaks, while overstory maples had lower survival than overstory oaks. The greatest reductions in density and basal area occurred in saplings (trees 2-10. cm DBH) and midstory trees on sub-xeric and intermediate (but not sub-mesic) landscape positions. Both Less Frequent and Frequent burning reduced density and basal area of sapling and mid-story shade-tolerant species, but also of mid-story chestnut oaks. Individual tree mortality was positively correlated with char height after the first burn regardless of burn frequency. A large and significant initial sprouting response to fire dissipated over time and with repeated burning. Future assessments of mortality and vigor of residual trees following fire are essential for evaluating the long-term effectiveness of prescribed fire management in shifting species composition away from 'mesophytic' species and toward oaks, and could help guide management choices regarding repeated prescribed burning.

Original languageEnglish
Pages (from-to)46-61
Number of pages16
JournalForest Ecology and Management
StatePublished - Mar 5 2015

Bibliographical note

Funding Information:
This study (#14-09-084) is connected with a project of the Kentucky Agricultural Experiment Station. The research was supported by the USDA-USDI Joint Fire Science Program (01-3-3-14, 04-2-1-06) through a cooperative research agreement with the USDA Forest Service Southern Research Station, a Challenge Cost-Share Agreement with the Daniel Boone National Forest, and funding through the University of Kentucky provided by the McIntire-Stennis Act. We appreciate the contributions of many people, too numerous to mention individually, who supported this through field work, laboratory support, and elements of study design and site selection. Special thanks, however, are warranted to Autumn Foushee, Jessi Lyons, and Gretchen Carmean who led the field crews during many of the field seasons that led to the data presented here. We are also indebted to our USDA Forest Service collaborators from the Cumberland District of the Daniel Boone National Forest, including Jeff Lewis, EJ Bunzendahl, and David Manner.

Publisher Copyright:
© 2015 Elsevier B.V.


  • Acer
  • Mesophytic
  • Prescribed fire
  • Quercus
  • Sprouting
  • Stand structure

ASJC Scopus subject areas

  • Forestry
  • Nature and Landscape Conservation
  • Management, Monitoring, Policy and Law


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