Dendrochronological analysis of Sequoia sempervirens in an interior old-growth forest |
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| Affiliation: | 1. Department of Forestry and Wildland Resources, Humboldt State University, Arcata, CA, 95521, USA;2. Land Trust of Napa County, 1700 Soscol Ave, Suite 20, Napa, CA, 94559, USA;1. Department of Geology and Geography, West Virginia University, Morgantown, WV, USA;2. School of Geography, Development and Environment and Laboratory of Tree-Ring Research, University of Arizona, Tucson, AZ, USA;3. Department of Geology and Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20742, USA;4. School of Biological Sciences, University of Tasmania, Hobart, TAS, Australia;1. Key Laboratory of Humid Subtropical Eco-geographical Process (Ministry of Education), Fujian Normal University, Fuzhou, 350007, China;2. College of Geography and Tourism, Huanggang Normal University, Huanggang, 438000, China;3. Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Box 460 S-405 30, Gothenburg, Sweden;4. Swiss Federal Institute for Forest Snow and Landscape Research WSL, Birmensdorf, Switzerland;5. Faculty of Environment and Resource Studies, Mahidol University, 999 Phutthamonthon Rd4, Salaya, Phutthamonthon, Nakhon Pathom, 73170, Thailand;6. CAS Center for Excellence in Tibetan Plateau Earth Sciences, China;7. Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;8. University of Chinese Academy of Sciences, Beijing, China;1. National Plateau Wetlands Research Center/Wetlands College, Southwest Forestry University, Kunming, China;2. MOE Key Laboratroy of Western China’ Environmental Systems, College of Earth Environmental Sciences, Lanzhou University, Lanzhou, China;1. State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Science, Chinese Academy of Sciences, Beijing 100085, China;2. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, China;3. College of Forestry, Northeast Forestry University, Harbin 150040, China;1. Department of Geography, Universität Innsbruck, 6020, Innsbruck, Austria;2. Department of Physical Geography, Stockholm University, 106 91, Stockholm, Sweden |
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| Abstract: | Dendrochronological studies of large and old Sequoia sempervirens are limited by access and complex crossdating, but core sampling at regular height intervals along the main trunks of five standing trees allowed for reconstruction of growth, height, and age while providing within-tree replication for crossdating. We developed a crossdated ring-width chronology (1453–2015) for redwoods growing in an easternmost old-growth forest in the Napa Range of California, determined aboveground tree attributes, investigated the inter-annual climate-growth relationships since the late 19th century, and documented long-term growth trends. Age, height, f-DBH (functional diameter at breast height), and aboveground biomass of these co-dominant trees ranged from 241 to 783 years, 45.7 to 61.5 m, 117.0 to 226.9 cm, and 9.34 to 33.62 Mg, respectively. Bootstrapped correlation and response function analysis showed radial growth positively related to May through August Palmer Drought Severity Index (PDSI) and negatively related to maximum June temperature (r ≥ │0.47│, P < 0.0001), explaining 33.3% of ring-width variation. Bootstrapped correlations over a moving 40-year window indicated strengthening relationships with PDSI and minimum temperature. The long-term growth trend, reflected by the size-detrended metric of residual wood volume increment (RWVI), varied over time and showed an average one-year decrease of 13.3% for 20th and 21st century droughts. A fire detected in August 1931 corresponded with a one-year decrease in RWVI of 43.1% followed by >100% increase within five years. Growth dynamics for redwoods in this interior forest provide a point of comparison for redwoods previously studied in old-growth forests along the latitudinal gradient, highlighting range-wide trends and site-specific differences in responses to climate and fire. |
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| Keywords: | Coast redwood Dendrochronology Climate Drought Fire Tree age |
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