No systematic effects of sampling direction on climate-growth relationships in a large-scale,multi-species tree-ring data set |
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| Institution: | 1. Institut für Archäologie, Fachbereich Prähistorische Archäologie, University of Zurich, 8006, Zurich, Switzerland;2. Department of Environmental System Science, Institute of Terrestrial Ecosystems, Forest Ecology, ETH Zurich, 8092, Zurich, Switzerland;3. Institute for Soil Sciences and Agricultural Chemistry, MTA Centre for Agricultural Research, 1022, Budapest, Hungary;4. Dendrometry and Forest Productivity, Warsaw University of Life Sciences – SGGW, 02-776, Warszawa, Poland;5. Pyrenean Institute of Ecology, Spanish Research Council, CSIC, 50059, Zaragoza, Spain;6. Department of Geosciences, Szczecin University, 70–383, Szczecin, Poland;7. Landscape Ecology and Ecosystem Dynamics, Greifswald University, 17487, Greifswald, Germany;8. Forest Research Institute, National Agricultural Research and Innovation Centre, 9600, Sárvár, Hungary;9. Department of Geography and Planning, University of Liverpool, L69 7ZT, Liverpool, United Kingdom;10. Dept. de Ciencias Agroforestales, Escuela Técnica Superior de Ingeniería, Universidad de Huelva, 21819, La Rábida, Spain;11. Bamboo Research Institute, Nanjing Forestry University, 210037, Nanjing, China;12. Department of Geosciences and Natural Resource Management, University of Copenhagen, 1958, Frederiksberg C, Denmark;13. Canadian Wood Fibre Centre, Natural Resources Canada, V8Z 1M5, Victoria, Canada;14. Faculty of Earth Sciences, University of Silesia, 41-200, Sosnowiec, Poland;15. Faculty of Forestry, University of Belgrade, 11000, Belgrade, Serbia;p. Forest Management Planning, Warsaw University of Life Sciences – SGGW, 02-776, Warszawa, Poland;q. Institute for Geological and Geochemical Research, Research Centre for Astronomy and Earth Sciences, MTA, 1112, Budapest, Hungary;r. Department of Silviculture and Forest Tree Genetics, Forest Research Institute, 05-090, Raszyn, Poland;s. Department of Wood Science, Mendel University, 613 00, Brno, Czech Republic;t. Global Change Research Institute of the Czech Academy of Sciences, 603 00, Brno, Czech Republic;u. Faculty of Forest and Environment, Eberswalde University for Sustainable Development, 16225, Eberswalde, Germany;v. Glaciology, Institute of Geography, Russian Academy of Sciences, 119017, Moscow, Russia;w. Centre for Forest Biology, University of Victoria, V8W 2Y2, Victoria, Canada;x. Forest Ecology, National Institute for Research and Development in Forestry “Marin Dr?cea”, 500040, Brasov, Romania;y. Sylviculture and Forest Engineering, University of Transylvania, 500123, Brasov, Romania;z. Department of Biology, University of Hradec Králové, 500 03, Hradec Králové, Czech Republic;1. Institute of Meteorology and Climate Research – Atmospheric Environmental Research (IMK-IFU), Karlsruhe Institute of Technology (KIT), 82467, Garmisch-Partenkirchen, Germany;2. Department of Physical Geography, Stockholm University, 106 91, Stockholm, Sweden;3. Dept. de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, 41013, Sevilla, Spain;4. Physical Geography, Center for Earth System Research and Sustainability (CEN), Universität Hamburg, 20146, Hamburg, Germany;5. Forest Ecology and Forest Management, Wageningen University and Research, 6708 PB, Wageningen, Netherlands;6. Land Surface-Atmosphere Interactions, Technische Universität München, 85354, Freising, Germany |
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| Abstract: | Ring-width series are important for diverse fields of research such as the study of past climate, forest ecology, forest genetics, and the determination of origin (dendro-provenancing) or dating of archaeological objects. Recent research suggests diverging climate-growth relationships in tree-rings due to the cardinal direction of extracting the tree cores (i.e. direction-specific effect). This presents an understudied source of bias that potentially affects many data sets in tree-ring research.In this study, we investigated possible direction-specific growth variability based on an international (10 countries), multi-species (8 species) tree-ring width network encompassing 22 sites. To estimate the effect of direction-specific growth variability on climate-growth relationships, we applied a combination of three methods: An analysis of signal strength differences, a Principal Component Gradient Analysis and a test on the direction-specific differences in correlations between indexed ring-widths series and climate variables.We found no evidence for systematic direction-specific effects on tree radial growth variability in high-pass filtered ring-width series. In addition, direction-specific growth showed only marginal effects on climate-growth correlations. These findings therefore indicate that there is no consistent bias caused by coring direction in data sets used for diverse dendrochronological applications on relatively mesic sites within forests in flat terrain, as were studied here. However, in extremely dry, warm or cold environments, or on steep slopes, and for different life-forms such as shrubs, further research is advisable. |
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| Keywords: | Tree-rings Directional growth Climate signal Dendro-provenancing Principal Component Gradient Analysis Correlation analysis |
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