Effects of climate on the radial growth of mixed stands of Nothofagus nervosa and Nothofagus obliqua along a precipitation gradient in Patagonia,Argentina |
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| Institution: | 1. Department of Geography, Environment and Geomatics, University of Guelph, 50 Stone Rd. E., Guelph ON, N1G 2W1, Canada;2. Universidad Nacional de Río Negro, Instituto de Investigaciones en Recursos Naturales, Agroecología y Desarrollo Rural (IRNAD), EL Bolsón 8430, Argentina;3. Consejo Nacional de Investigaciones Científicas y Técnicas, Instituto de Investigaciones en Recursos Naturales, Agroecología y Desarrollo Rural (IRNAD), EL Bolsón 8430, Argentina;4. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales, CCT CONICET, Mendoza 5500 Argentina;5. Instituto Nacional de Tecnología Agropecuaria (INTA), San Carlos de Bariloche 8400, Argentina;1. School of Geography, Planning and Spatial Sciences, University of Tasmania, Sandy Bay 7005 Australia;2. School of Ecosystem and Forest Sciences, University of Melbourne, Richmond 3121, Australia;3. Australian Research Council Centre of Excellence for Australian Biodiversity and Heritage, University of New South Wales, Sydney 2052, Australia;4. School of Natural Sciences, University of Tasmania, Sandy Bay 7005 Australia;1. University of Fribourg, Department of Geosciences, Switzerland;2. University of Zurich, Department of Geography, Switzerland;3. Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY, USA;4. Institute of Earth Sciences, Hebrew University of Jerusalem, Jerusalem, Israel;5. Northern Arizona University, School of Earth and Sustainability, Flagstaff, AZ, USA;6. Institute of Geography and Oeschger Centre for Climate Change Research, University of Bern, Switzerland;1. Embrapa Florestas, Estrada da Ribeira Km 111, Caixa Postal 319, 83411–000 Colombo, PR, Brazil;2. Federal Rural University of Rio de Janeiro, Rod. BR 465, Km 07, 23890–000 Seropédica, RJ, Brazil;3. Federal University of Paraná, Av. Pref. Lothario Meissner 900, 80210–170 Curitiba, PR, Brazil;1. Professorship for Land Surface-Atmosphere Interactions, Technical University of Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354 Freising, Germany;2. Biological and Environmental Sciences, University of Stirling, FK9 4LA Scotland, UK;3. Forest Research, Northern Research Station, Roslin, Midlothian EH25 9SY, Scotland, UK;1. State key laboratory of vegetation and environmental change, Institute of Botany, Chinese Academy of Sciences, Xiangshan, Haidian District, Beijing 100093, China;2. University of the Chinese Academy of Sciences, Beijing, China;3. Linzhou Bureau of Meteorology, Linzhou, Lhasa, Tibet, China;4. Tibet Agricultural and Animal Husbandry University, Tibet, Linzhi, China;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 |
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| Abstract: | Climate models for North Patagonia in Argentina project dryer conditions, due to a decrease in mean precipitation combined with an increase in mean temperatures. The temperate mixed Nothofagus forest, which exists along a steep precipitation gradient, could be directly impacted. For this study, we evaluated the influence of mean climate on the growth of the significant deciduous species: N. nervosa and N. obliqua. For the first time in Argentina, dendroclimatological analyses were done on both species using a network of 14 chronologies, covering their longitudinal distribution along a gradient of declining precipitation from west to east. Seasonal correlation analysis revealed that temperature has a negative effect on the growth of both species across all sites, particularly during summer of the previous and current growth season. Precipitation has a positive effect on the growth of trees for both species, which is more significant for N. nervosa. The relationship between early-summer climate and growth remained relatively stable over time for N. nervosa; however, for N. obliqua the detrimental effects of temperature increased towards the end of the 20th century, and the positive effects of precipitation decreased, particularly at the driest end of the gradient. These results suggest that a continued decrease in rainfall with a rise in temperature could impact growth for both of these species. |
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| Keywords: | Tree-rings Climate-growth response Precipitation gradient ENSO SAM |
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