Dendrochronological potential of the Azorean endemic gymnosperm Juniperus brevifolia (Seub.) Antoine |
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| Institution: | 1. CIBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, InBIO Laboratório Associado, Pólo dos Açores, Universidade dos Açores, Campus de Ponta Delgada, Rua da Mãe de Deus, 9500-321 Ponta Delgada, Açores, Portugal;2. Faculty of Sciences and Technology, University of the Azores, Campus de Ponta Delgada, Rua da Mãe de Deus, 9500-321 Ponta Delgada, Portugal;3. Slovenian Forestry Institute, Department of Forest Yield and Silviculture, Ve?na pot 2, 1000 Ljubljana, Slovenia;4. Avans University of Applied Sciences, Environmental Sciences for Sustainable Energy and Technology, Postbus 90.116, 4800 RA Breda, The Netherlands;5. IVAR – Instituto de Vulcanologia e Avaliação de Riscos, University of the Azores, Campus de Ponta Delgada, Rua da Mãe de Deus, 9500-321 Ponta Delgada, Portugal;6. cE3c/ABG – Centre for Ecology, Evolution and Environmental Changes/Azorean Biodiversity Group and Universidade dos Açores, Faculdade de Ciências Agrárias e do Ambiente, 9700-042 Angra do Heroísmo, Açores, Portugal;1. Institute of Geoecology and Geoinformation, Faculty of Geographical and Geological Sciences, Adam Mickiewicz University, B. Krygowskiego 10, 61–680 Poznań, Poland;2. Swiss Federal Research Institute WSL, Zürcherstrasse 111, CH-8903 Birmensdorf, Switzerland;3. Institute of Dendrology, Polish Academy of Sciences, Parkowa 5, 62–035 Kórnik, Poland;4. Poznań University of Life Sciences, Faculty of Forestry and Wood Technology, Department of Game Management and Forest Protection, Wojska Polskiego 71c, 60–625 Poznań, Poland;5. Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Slovenia, Jamnikarjeva 101, 1000 Ljubljana, Slovenia;1. Cátedra de Dasonomía, Facultad de Ciencias Agrarias, Universidad Nacional de Cuyo, Mendoza, Argentina;2. Institute of Botany, Czech Academy of Sciences, 25243 Pr?honice, Czech Republic;3. Laboratorio de Dendrocronología de Zonas Áridas, CIGEOBIO (CONICET-UNSJ), Gabinete de Geología Ambiental (INGEO-UNSJ), San Juan, Argentina;4. Laboratorio de Dendrocronología e Historia Ambiental, IANIGLA-CCT CONICET, Mendoza, Argentina;5. Hémera Centro de Observación de la Tierra, Escuela de Ingeniería Forestal, Facultad de Ciencias, Universidad Mayor, Huechuraba, Santiago, Chile;1. AGH University of Science and Technology, A. Mickiewicza Ave. 30, 30-059, Kraków, Poland;2. Institute of Nature Conservation, Polish Academy of Sciences, A. Mickiewicza Ave. 33, 31-120, Kraków, Poland;3. Kazimierza Wielkiego Str. 110/2-3, 30-074, Kraków, Poland;4. W. Szafer Institute of Botany, Polish Academy of Sciences, Lubicz Str. 46, 31-512, Kraków, Poland;5. Pedagogical University, Institute of Geography, Podchor??ych Str. 2, 30-084, Kraków, Poland;1. Nature Rings – Environmental Research and Education, Mainz, Germany;2. Department of Geography, Justus-Liebig-University, Gießen, Germany;3. Institute for Geosciences, Johannes Gutenberg University, Mainz, Germany;4. Department of Geography, Johannes Gutenberg University, Mainz, Germany;5. Deutscher Wetterdienst, Offenbach, Germany;6. Department of Geography, University of Cambridge, UK;7. Swiss Federal Research Institute WSL, Birmensdorf, Switzerland;8. Global Change Research Centre AS CR, Brno, Czech Republic;1. Siberian Federal University, 79 Svobodny pr., 660041 Krasnoyarsk, Russia;2. V.N. Sukachev Institute of Forest SB RAS, Federal Research Center ‘Krasnoyarsk Science Center SB RAS‘, Akademgorodok 50/28, Krasnoyarsk 660036, Russia;3. Department of Geography, University of Cambridge, CB2 3EN, UK;1. USDA Forest Service, USDA Forest Service, Forest Products Laboratory, 1 Gifford Pinchot Drive, Madison, WI 53726, USA;2. Meadowview Biological Research Station, 8390 Fredericksburg Tnpk., Woodford, VA 22580, USA;3. USDA Forest Service, 201 14th St SW, Washington D.C. 20250, USA |
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| Abstract: | Tree-ring inter-annual pattern variation is crucial in dendrochronology, allowing the identification of possible limiting factors on growth. Thus, trees exposed to subtropical or tropical climates without a marked seasonality may show a low degree of interannual variation, impeding a straightforward dendroclimatological approach. Meanwhile, subtropical regions, and areas in transitional climates such as the Azores archipelago, are widely unexplored in terms of dendroclimatology, providing opportunities to work with endemic trees, including the dominant Azorean tree Juniperus brevifolia (Seub.) Antoine. To evaluate the dendrochronological potential of J. brevifolia, we analyzed tree-ring patterns, crossdating capabilities, and correlation with climate parameters. We sampled 48 individual trees from two natural populations (São Miguel and Terceira islands) using an increment borer. Besides, a Trephor tool was used to obtain wood microcores for micro-anatomical analysis. Although the transition between early and latewood was evident, partially indistinct ring boundaries and wedging rings were present in some cases, affecting the crossdating process, but not impeding the establishment of reliable ring-width chronologies. Following detrending, master chronologies were built and correlated with monthly temperature and precipitation data using the treeclim R package. The climate-growth relationships indicated negative correlations with late summer temperature in both populations. Considering our results and the importance of J. brevifolia as a dominant tree in the Azores natural forests, we conclude that it shows an acceptable potential for dendrochronological research. Thus, this study provides baseline information to help fill the knowledge gap regarding the climate-growth relationship of Azorean trees. |
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| Keywords: | Azores Climate response Crossdating Dendroclimatology |
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