Skip to Main Content
Long-term demographic trends in a fire-suppressed mixed-conifer forestAuthor(s): Carrie R. Levine; Flora Krivak-Tetley; Natalie S. van Doorn; Jolie-Anne S. Ansley; John J. Battles
Source: Canadian Journal of Forest Research. 46(5): 745-752
Publication Series: Scientific Journal (JRNL)
Station: Pacific Southwest Research Station
Download Publication (1.0 MB)
DescriptionIn the western United States, forests are experiencing novel environmental conditions related to a changing climate and a suppression of the historical fire regime. Mixed-conifer forests, considered resilient to disturbance due to their heterogeneity in structure and composition, appear to be shifting to a more homogeneous state, but the timescale of these shifts is not well understood. Our objective was to assess the effects of climate and fire suppression on stand dynamics and demographic rates of an old-growth mixed-conifer forest in the Sierra Nevada. We used a Bayesian hierarchical analysis to quantify species and community rates of recruitment, growth, and mortality. Despite a warming climate, we found that stand density, basal area, and carbon have increased over 56 years. Fir recruitment and growth significantly exceeded the community-level median rates, whereas pine recruitment and growth was significantly lower than the community-level median rates. Shifts in species composition from a well-mixed stand to a more dense fir-dominated stand appear to be driven by low growth and recruitment rates of pines relative to firs. In forests such as these with consistent and relatively low mortality rates, we recommend that restoration and management activities be focused on promoting pine recruitment and growth.
- You may send email to firstname.lastname@example.org to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLevine, Carrie R.; Krivak-Tetley, Flora; van Doorn, Natalie S.; Ansley, Jolie-Anne S.; Battles, John J. 2016. Long-term demographic trends in a fire-suppressed mixed-conifer forest. Canadian Journal of Forest Research. 46(5): 745-752.
KeywordsCalifornia, mixed conifer, fire, suppression, climate change, Bayesian
- Initial tree regeneration responses to fire and thinning treatments in a Sierra Nevada mixed-conifer forest, USA
- Wildfire and drought dynamics destabilize carbon stores of fire-suppressed forests
- Thirty year change in lodgepole and lodgepole/mixed conifer forest structure following 1980s mountain pine beetle outbreak in western Colorado, USA
XML: View XML