Stationarity of climate-growth response is only marginally influenced by the soil moisture regime in Western Siberia |
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| Institution: | 1. Institute of Plant and Animal Ecology UB RAS, Ekaterinburg, Russia;2. Greifswald University, Greifswald, Germany;3. Department of Physical Geography and Geoecology, Faculty of Science, Charles University, Prague, Czech Republic;4. Technical University Munich, Freising, Germany;1. Institute of Botany and Landscape Ecology, University Greifswald, Soldmannstr. 15, 17487 Greifswald, Germany;2. Department of Environmental Security, Faculty of Logistics and Crisis Management, Tomas Bata University in Zlín, nám. T.G. Masaryka 5555, 760 01 Zlín, Czech Republic;1. Forest National Institute for Research and Development in Forestry “Marin Drăcea”, Research Station for Norway spruce Silviculture, Calea Bucovinei 73 bis, Câmpulung Moldovenesc, Romania;2. Department of Forest Management Planning and Geodesy, Faculty of Forestry, Technical University in Zvolen, T.G. Masaryka 24, 96053, Zvolen, Slovakia;3. National Forest Centre, Forest Research Institute Zvolen, T.G. Masaryka 22, 96092, Zvolen, Slovakia;4. Department of Geography, University of Cambridge, Cambridge, CB2 3EN, UK;5. Swiss Federal Research Institute, 8903, Birmensdorf, Switzerland;6. CzechGlobe & Department of Geography, Masaryk University, 61137, Brno, Czech Republic;1. Area of Ecology, Faculty of Biology, University of Salamanca, Salamanca, Spain;2. Applied Ecology: Ecosystem Restoration and Biodiversity Management, University of Salamanca, Salamanca, Spain;3. Climate Change Impacts and Risks in the Anthropocene, Institute for Environmental Sciences, University of Geneva, Switzerland;1. Chair of Forest Growth and Woody Biomass Production, TU Dresden, Germany;2. Landesforstanstalt Mecklenburg-Vorpommern, Malchin, Germany;3. Landesforstanstalt Mecklenburg-Vorpommern, Schwerin, Germany;4. Institute of Botany and Landscape Ecology, University of Greifswald, Germany;1. Eurasia Institute of Earth Sciences, Istanbul Technical University, 34469, Istanbul, Turkey;2. Faculty of Forestry, Forest Botany Department, Istanbul University-Cerrahpaşa, Istanbul, Turkey;3. Division of Ecology, Department of Biology, Hacettepe University, Beytepe, 06800, Ankara, Turkey;4. Laboratory of Tree-Ring Research, University of Arizona, Tucson, USA |
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| Abstract: | Stationary (time-stable) relationships between a tree-ring proxy and climatic drivers are a prerequisite for using tree rings as paleo-climatological archives, but non-stationarity has been detected worldwide. Here we use a classical, temperature-sensitive treeline site in Western Siberia to specifically test the influence of micro-site conditions (wet versus dry) on the stationarity of climate-growth relationships in three co-existing conifer species: Larix sibirica Ledeb., Picea obovata Ledeb., and Pinus sibirica DuTour. We test two commonly used tree-ring proxies, annual tree-ring width (TRW) and maximum latewood density (MXD), using moving windows and the bootstrapped transfer function stability test (BTFS). Summer temperature is the main driver of tree growth in all three species, but non-stationarities exist in all species and both tree-ring proxies. For TRW, we found stationarity only for larch from both micro-sites, while for MXD, we found stationarity for spruce from both micro-sites, and for pine from the wet micro-site. Micro-site variability did not seem to affect stationarity in any systematic way. We highlight the necessity to systematically test the influence of different methods of stationarity tests, since BTFS was more sensitive than moving-window analysis. Taken together, our results underscore the importance of testing the assumption of stationarity for diverse micro-sites, different species and proxies at all sites prior to any tree-ring based temperature reconstruction, since even within one site results can be drastically different. |
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| Keywords: | Model calibration Stationarity Micro-site Tree-ring width Maximum latewood density Boreal forest |
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