3/10/2023 0 Comments Ecotone firesBNZ:786, įunding: This project was supported by funding awarded to MCM, JFJ and EAGS from the NASA Arctic Boreal and Vulnerability Experiment (ABoVE) Legacy Carbon grant NNX15AT71A and the Bonanza Creek Long-Term Ecological Research Program, which is funded by National Science Foundation grant # DEB1636476 and the USDA Forest Service Pacific Northwest Research Station. Toklat River Fire in Denali National Park and Preserve: Site level environmental, soil, tree, vegetation, and fire characteristics measured in 2016, Bonanza Creek LTER - University of Alaska Fairbanks. R code used for statistical analyses is also archived on github at Walker, Xanthe Mack, Michelle C Johnstone, Jill. The work is made available under the Creative Commons CC0 public domain dedication.ĭata Availability: All data and R code from this study is archived in the US National Science Foundation-funded Bonanza Creek Long Term Ecological Research Data Catalog, which is part of EDI Data Portal. This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. Received: JAccepted: SeptemPublished: October 28, 2021 PLoS ONE 16(10):Įditor: Dafeng Hui, Tennessee State University, UNITED STATES (2021) Impacts of pre-fire conifer density and wildfire severity on ecosystem structure and function at the forest-tundra ecotone. increased density) at the forest-tundra ecotone could increase fire severity, but this infilling is unlikely to occur without increases in the availability of viable seed.Ĭitation: Walker XJ, Howard BK, Jean M, Johnstone JF, Roland C, Rogers BM, et al. We conclude that the expected climate-induced forest infilling (i.e. Our seed rain observations and seeding experiment indicate that the recruitment potential of conifer trees is limited by seed availability in this forest-tundra ecotone. Sites with higher pre-fire conifer density were also located at warmer and drier landscape positions and associated with increased ALT post-fire, greater changes in pre- and post-fire understory vegetation communities, and higher post-fire boreal tree recruitment. On average, burn depth of the organic soil was 10.6 ± 4.5 cm and both burn depth and total C combusted increased with pre-fire conifer density. We found that an average of 2.18 ± 1.13 Kg C m -2 was emitted from this fire, almost 95% of which came from burning of the organic soil. We also assessed conifer seed rain and used a seeding experiment to determine factors controlling post-fire tree regeneration. We assessed wildfire severity and C emissions, and determined the impacts of severity on understory vegetation composition, conifer tree recruitment, and active layer thickness (ALT). We studied 48 sites spanning a gradient from tundra to low-density spruce stands that were burned in an extensive 2013 wildfire on the north slope of the Alaska Range in Denali National Park and Preserve, central Alaska. Understanding the impacts of wildfire throughout this ecotone is required to make predictions of the rate and magnitude of changes in boreal-tundra landcover, its future flammability, and associated feedbacks to the global carbon (C) cycle and climate. Wildfire frequency and extent is increasing throughout the boreal forest-tundra ecotone as climate warms.
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