Increasing elevation of fire in the Sierra Nevada and implications for forest change

Ecosphere
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Abstract

Fire in high-elevation forest ecosystems can have severe impacts on forest structure, function and biodiversity. Using a 105-year data set, we found increasing elevation extent of fires in the Sierra Nevada, and pose five hypotheses to explain this pattern. Beyond the recognized pattern of increasing fire frequency in the Sierra Nevada since the late 20th century, we find that the upper elevation extent of those fires has also been increasing. Factors such as fire season climate and fuel build up are recognized potential drivers of changes in fire regimes. Patterns of warming climate and increasing stand density are consistent with both the direction and magnitude of increasing elevation of wildfire. Reduction in high elevation wildfire suppression and increasing ignition frequencies may also contribute to the observed pattern. Historical biases in fire reporting are recognized, but not likely to explain the observed patterns. The four plausible mechanistic hypotheses (changes in fire management, climate, fuels, ignitions) are not mutually exclusive, and likely have synergistic interactions that may explain the observed changes. Irrespective of mechanism, the observed pattern of increasing occurrence of fire in these subalpine forests may have significant impacts on their resilience to changing climatic conditions.



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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Increasing elevation of fire in the Sierra Nevada and implications for forest change
Series title Ecosphere
DOI 10.1890/ES15-00003.1
Volume 6
Issue 7
Year Published 2015
Language English
Publisher Ecological Society of America
Publisher location Washington, DC
Contributing office(s) Western Ecological Research Center
Description art121: 10 p.
Country United States
State California
Other Geospatial Sierra Nevada, Kings Cayon National Park, Yosemite National Park, Sequoia National Park
Online Only (Y/N) N
Additional Online Files (Y/N) N