Fire affects wood formation dynamics and ecophysiology of Pinus pinaster Aiton growing in a dry Mediterranean area |
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| Affiliation: | 1. Department of Environmental, Biological, Pharmaceutical Sciences and Technologies, University of Campania “Luigi Vanvitelli”, Via Vivaldi 43, 81100 Caserta, Italy;2. The Earth Institute, Tree-ring Laboratory, Lamont-Doherty Earth Observatory of Columbia University, New York 10964, United States of America;3. Department of Agricultural Sciences, University of Naples Federico II, via Università 100, 80055, Portici, Italy;1. Beijing Key Laboratory of Traditional Chinese Medicine Protection and Utilization, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China;2. College of Life Sciences, Hebei Normal University, Shijiazhuang, Hebei 050024, China;3. Environment and Sustainability Institute, University of Exeter, Penryn Campus, Penryn, Cornwall TR10 9FE, UK;1. Jan Evangelista Purkyně University, Faculty of Environment, Department of Environment, Pasteurova 15, 400 96 Ústí n. Labem, Czech Republic;2. Czech University of Life Sciences Prague, Faculty of Forestry and Wood Sciences, Kamýcká 129, Suchdol, 165 00 Praha 6, Czech Republic;3. Czech Academy of Sciences, Institute of Botany, Dukelská 135, Třeboň 379 01, Czech Republic;1. Universidade de São Paulo, Escola Superior de Agricultura Luiz de Queiroz, Department of Forest Resource, Av. Pádua Dias No 11, Piracicaba, São Paulo 13418-900, Brazil;2. Department of Plant Biology, Institute of Biology, University of Campinas – UNICAMP, Campinas, São Paulo 13083-970, Brazil;3. Argentine Institute of Nivology, Glaciology and Environmental Sciences (IANIGLA), CONICET-Universidad Nacional de Cuyo, Mendoza 5500, Argentina;4. Hémera Centro de Observación de la Tierra, Escuela de Ingeniería Forestal, Facultad de Ciencias, Universidad Mayor, Santiago 8580745, Chile;1. Institute of Ecology and Evolution, University of Jena, Jena, Germany;2. Chair of Forest Growth and Woody Biomass Production, TU Dresden, Tharandt, Germany |
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| Abstract: | The increase in frequency and intensity of wildfires is seriously affecting forest ecosystems, especially in drought-prone areas. Trees’ recovery after fire is related to direct tree damage and is influenced by climate conditions, such as warm temperature and water shortage. In this study, we evaluate the post-fire effects on a Pinus pinaster Aiton forest growing in a hot and dry area of the Mediterranean region by comparing burned trees with severe crown reduction against unburned and not-defoliated trees. Inter-annual analyses of dendrochronology and stable isotopes in tree rings were combined with xylogenesis monitoring to investigate the effects of fire on tree growth, ecophysiological processes and wood formation. Tree-ring and isotope data showed a growth reduction and a decrease in photosynthetic activity in the burned trees, compared to control individuals, in the three years after fire. Further, the monitoring of cambial activity demonstrated a negative influence of warm and dry periods on wood formation, low xylem production, a delay in phenology and a reduction in xylem plasticity in burned trees. Our findings suggest that substantial photosynthetic limitations caused by crown defoliation and recurrent drought events could lead to severe growth decrease and reduction of trees ability to regain the pre-disturbance productivity rates. |
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| Keywords: | Carbon and oxygen stable isotopes Intra-annual tree-ring analyses Post-fire recovery Xylogenesis monitoring |
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