Sponsor
Funding: the work was partially supported by NSF 1737706.
Published In
Environmental Research Letters
Document Type
Article
Publication Date
2020
Subjects
Wildfires -- research, Wildfire risk -- United States
Abstract
Wildfires are a significant agent of disturbance in forests and highly sensitive to climate change. Short-interval fires and high severity (mortality-causing) fires in particular, may catalyze rapid and substantial ecosystem shifts by eliminating woody species and triggering conversions from forest to shrub or grassland ecosystems. Modeling and fine-scale observations suggest negative feedbacks between fire and fuels should limit reburn prevalence as overall fire frequency rises. However, while we have good information on reburning patterns for individual fires or small regions, the validity of scaling these conclusions to broad regions like the US West remains unknown. Both the prevalence of reburning and the strength of feedbacks on likelihood of reburning over differing timescales have not been documented at the regional scale. Here we show that while there is a strong negative feedback for very short reburning intervals throughout wildland forests of the Western US, that feedback weakens after 10–20 years. The relationship between reburning intervals and drought diverges depending on location, with coastal systems reburning quicker (e.g. shorter interval between fires) in wetter conditions and interior forests in drier. This supports the idea that vegetation productivity—primarily fine fuels that accumulate rapidly (years)—is of primary importance in determining reburn intervals. Our results demonstrate that while over short time intervals increasing fires inhibits reburning at broad scales, that breaks down after a decade. This provides important insights about patterns at very broad scales and agrees with finer scale work, suggesting that lessons from those scales apply across the entire western US.
Rights
Copyright 2020 by the authors.
This work is licensed under a Creative Commons Attribution 4.0 International License.
Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Locate the Document
DOI
10.1088/1748-9326/ab6c70
Persistent Identifier
https://archives.pdx.edu/ds/psu/33039
Citation Details
Buma, B., Weiss, S., Hayes, K., & Lucash, M. (2020). Wildland fire reburning trends across the US West suggest only short-term negative feedback and differing climatic effects. Environmental Research Letters, 15(3), 034026.
Description
Data and materials availability: all data is publicly available at https://doi.org/10.25412/iop.11704068.v1