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Pericolo, Osvaldo; Camarero, J. Julio; Colangelo, Michele; Valeriano, Cristina; Sánchez-Salguero, Raúl; Borghetti, Marco; Castellaneta, Maria; Nola, Paola; Ripullone, Francesco
Agricultural and forest meteorology, 01/2023, Volume: 328Journal Article
•Floodplain and riparian forests are among the most vulnerable ecosystems.•We compared growth of coexisting trees in a temperate and Mediterranean conditions.•Climate and tree-ring data were combined with growth models to detect growth decline.•Warmer springs and drier summers reduce oak and ash growth.•Alder was the most drought resistant species. Floodplain forests are sensitive to climate warming and increased drought, as showed by recent oak (Quercus robur) dieback and mortality episodes. However, a comprehensive comparison of coexisting tree species under different climate settings or biomes are lacking. Herein, we compared growth rates, growth responses to climate and drought severity, and modeled climate mediated growth of oak and three coexisting tree species (ash, Fraxinus angustifolia; alder, Alnus glutinosa; elm, Ulmus minor). Two floodplain forests subjected to cooler (temperate climate, Ticino) and warmer (Mediterranean climate, Bosco Pantano) conditions in northern and southern Italy, respectively, were analyzed. Ash seemed to be the most sensitive to drought, particularly at the Mediterranean site where oak and elm growth were also negatively affected by water shortages. Alder appeared to be the least sensitive species in terms of growth variability to drought under both temperate and Mediterranean climate conditions. Furthermore, the growth model revealed the influence of soil moisture in spring and summer on the constrained growth of ash and oak and illustrated how oak growth could be severely reduced during drastic hotter droughts. Alder seemed to be the most drought-resistant species under both environmental conditions. These results could represent the first attempts in documenting the ecological consequences of drought in terms of projected climate trends in less investigated Mediterranean floodplain forests. Furthermore, these results highlight how climate and tree-ring data combined with growth models could be useful tools to detect early warning signals of growth decline and impending dieback in floodplain forests in response to dry spells.
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