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Cited by 257

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Short-interval severe fire erodes the resilience of subalpine lodgepole pine forests

Open access
Turner, Monica G., Braziunas, Kristin H., Hansen, Winslow D., Harvey, Brian J.·2019·Proceedings of the National Academy of Sciences

Abstract

Subalpine forests in the northern Rocky Mountains have been resilient to stand-replacing fires that historically burned at 100- to 300-year intervals. Fire intervals are projected to decline drastically as climate warms, and forests that reburn before recovering from previous fire may lose their ability to rebound. We studied recent fires in Greater Yellowstone (Wyoming, United States) and asked whether short-interval (<30 years) stand-replacing fires can erode lodgepole pine (Pinus contorta var.latifolia) forest resilience via increased burn severity, reduced early postfire tree regeneration, reduced carbon stocks, and slower carbon recovery. During 2016, fires reburned young lodgepole pine forests that regenerated after wildfires in 1988 and 2000. During 2017, we sampled 0.25-ha plots in stand-replacing reburns (n= 18) and nearby young forests that did not reburn (n= 9). We also simulated stand development with and without reburns to assess carbon recovery trajectories. Nearly all prefire biomass was combusted (“crown fire plus”) in some reburns in which prefire trees were dense and small (≤4-cm basal diameter). Postfire tree seedling density was reduced sixfold relative to the previous (long-interval) fire, and high-density stands (>40,000 stems ha−1) were converted to sparse stands (<1,000 stems ha−1). In reburns, coarse wood biomass and aboveground carbon stocks were reduced by 65 and 62%, respectively, relative to areas that did not reburn. Increased carbon loss plus sparse tree regeneration delayed simulated carbon recovery by >150 years. Forests did not transition to nonforest, but extreme burn severity and reduced tree recovery foreshadow an erosion of forest resilience.

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Metadata

Authors
Turner, M. G., Braziunas, K. H., Hansen, W. D., & Harvey, B. J.
Venue
Proceedings of the National Academy of Sciences
Published
2019-05-20
Volume
116
Issue
23
Pages
11319-11328
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2945137439
Cited by
257
References
8
FWCI
15.09
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Short-interval severe fire erodes the resilience of subalpine lodgepole pine forests. https://app.cochat.ai/papers/10.1073/pnas.1902841116
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Turner, M. G., Braziunas, K. H., Hansen, W. D., & Harvey, B. J. (2019). Short-interval severe fire erodes the resilience of subalpine lodgepole pine forests. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.1902841116

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