VS-oscilloscope: A new tool to parameterize tree radial growth based on climate conditions |
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Institution: | 1. Department of Geography, University of Cambridge, Downing Place, CB2 3EN, UK;2. Swiss Federal Research Institute WSL, Zürcherstr 111, 8903 Birmensdorf, Switzerland;3. Global Change Research Centre (CzechGlobe), Bělidla 986/4a, Brno 603 00 Brno, Czech Republic;4. Department of Geography, Faculty of Science, Masaryk University, Kotlářská 2, 613 00 Brno, Czech Republic |
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Abstract: | It is generally assumed in dendroecological studies that annual tree-ring growth is adequately determined by a linear function of local or regional precipitation and temperature with a set of coefficients that are temporally invariant. However, various researchers have maintained that tree-ring records are the result of multivariate, often nonlinear biological and physical processes. To describe critical processes linking climate variables with tree-ring formation, the process-based tree-ring Vaganov–Shashkin model (VS-model) was successfully used. However, the VS-model is a complex tool requiring a considerable number of model parameters that should be re-estimated for each forest stand. Here we present a new visual approach of process-based tree-ring model parameterization (the so-called VS-oscilloscope) which allows the simulation of tree-ring growth and can be easily used by researchers and students. The VS-oscilloscope was tested on tree-ring data for two species (Larix gmeliniiand Picea obovata) growing in the permafrost zone of Central Siberia. The parameterization of the VS-model provided highly significant positive correlations (p < 0.0001) between simulated growth curves and original tree-ring chronologies for the period 1950–2009. The model outputs have shown differences in seasonal tree-ring growth between species that were well supported by the field observations. To better understand seasonal tree-ring growth and to verify the VS-model findings, a multi-year natural field study is needed, including seasonal observation of the thermo-hydrological regime of the soil, duration and rate of tracheid development, as well as measurements of their anatomical features. |
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Keywords: | VS-model Parameterization VS-oscilloscope Central Siberia Permafrost Tree-ring width Tree-ring growth Climate signal Non-linear response Tree-ring growth rates Larch Spruce |
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