Interactive effects of global change drivers on tree regeneration in Mediterranean forests
| Autor: | Gómez Aparicio, Lorena, Homet, Pablo, Serrano, María S., Godoy, Óscar, Matías Resina, Luis |
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| Rok vydání: | 2021 |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Comunicación oral presentada en el XV Congreso Nacional de la AEET. "El valor de la naturaleza par una sociedad global"18-21 de octubre, Plasencia, Cáceres Global change is a complex phenomenon involving several factors that act simultaneously. However, most of their combined effects on natural ecosystems remain poorly understood. Here we explored the existence of non-additive effects (synergistic or antagonistic) among two global change drivers threating the long-term persistence of Mediterranean Quercus forests: rought and exotic pathogens. We took advantage of a rainfall exclusion infrastructure built on mixed Quercus suber forests of southern Spain to explore whether tree regeneration dynamics in these forests might be impacted by the combined effects of a drier climate (30% rainfall reduction) and the invasion by the exotic pathogen Phytophthora cinnamomi. We found both additive and non-additive effects of drought and soil-borne pathogens on different stages of the regeneration process. Even more importantly, non-additive effects were always antagonistic. This pattern of interaction among global change drivers strongly differs from the synergistic effects commonly reported in the literature, and can be explained by the negative direct effect of drought on pathogen abundance, indirectly boosting seedling establishment and growth under drought. Altogether, our results suggest that, at least in some situations, Mediterranean forests could be less susceptible to the combined effects of global change drivers than to their individual effects. Our results also highlight the complexity of predicting the effects of multiple global change drivers on forest dynamics, which might vary along the synergistic-antagonistic continuum depending on the particular characteristics of the drivers involved. |
| Databáze: | OpenAIRE |
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