Revealing legacy effects of extreme droughts on tree growth of oaks across the Northern Hemisphere

作者：Arun K. Bose, Jiří Doležal, Daniel Scherrer, Jan Altman, Daniel Ziche, Elisabet Martínez‐Sancho, Christof Bigler, Andreas Bolte, Michele Colangelo, Isabel Dorado‐Liñán, Igor Drobyshev, Sophia Etzold, Patrick Fonti, Arthur Geßler, Tomáš Kolář, Eva Koňasová, Kirill Korznikov, François Lebourgeois, Manuel Esteban Lucas‐Borja, Annette Menzel, Burkhard Neuwirth, Manuel Nicolas, Alexander M. Omelko, Neil Pederson, Any Mary Petriţan, Andreas Rigling, Michal Rybníček, Tobias Scharnweber, Jens Schröder, Fernando Silla, Irena Sochová, Kristina Sohar, Olga N. Ukhvatkina, Anna S. Vozmishcheva, Roman Zweifel, J. Julio Camarero · 发表于：The Science of The Total Environment · 年份：2024 · DOI：10.1016/j.scitotenv.2024.172049 · 被引用次数：51 · 研究领域：Plant Water Relations and Carbon Dynamics、Tree-ring climate responses、Ecology and Vegetation Dynamics Studies

Forests are undergoing increasing risks of drought-induced tree mortality. Species replacement patterns following mortality may have a significant impact on the global carbon cycle. Among major hardwoods, deciduous oaks (Quercus spp.) are increasingly reported as replacing dying conifers across the Northern Hemisphere. Yet, our knowledge on the growth responses of these oaks to drought is incomplete, especially regarding post-drought legacy effects. The objectives of this study were to determine the occurrence, duration, and magnitude of legacy effects of extreme droughts and how that vary across species, sites, and drought characteristics. The legacy effects were quantified by the deviation of observed from expected radial growth indices in the period 1940-2016. We used stand-level chronologies from 458 sites and 21 oak species primarily from Europe, north-eastern America, and eastern Asia. We found that legacy effects of droughts could last from 1 to 5 years after the drought and were more prolonged in dry sites. Negative legacy effects (i.e., lower growth than expected) were more prevalent after repetitive droughts in dry sites. The effect of repetitive drought was stronger in Mediterranean oaks especially in Quercus faginea. Species-specific analyses revealed that Q. petraea and Q. macrocarpa from dry sites were more negatively affected by the droughts while growth of several oak species from mesic sites increased during post-drought years. Sites showing positive correlat...