Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/17232
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Oak seedling survival and growth along resource gradients in Mediterranean forests: Implications for regeneration in current and future environmental scenarios
Authors: Gomez-Aparicio, Lorena
Perez-Ramos, Ignacio M
Mendoza, Irene
Matias, Luis
Quero, Jose Luis
Castro, Jorge
Zamora, Regino
Maranon, Teodoro
Contact Email: luis.matiasresina@stir.ac.uk
Issue Date: Nov-2008
Publisher: Wiely-Blackwell
Citation: Gomez-Aparicio L, Perez-Ramos IM, Mendoza I, Matias L, Quero JL, Castro J, Zamora R & Maranon T (2008) Oak seedling survival and growth along resource gradients in Mediterranean forests: Implications for regeneration in current and future environmental scenarios, Oikos, 117 (11), pp. 1683-1699.
Abstract: Understanding seedling performance across resource gradients is crucial for defining the regeneration niche of plant species under current environmental conditions and for predicting potential changes under a global change scenario. A 2-year field experiment was conducted to determine how seedling survival and growth of two evergreen and two deciduous Quercus species vary along gradients of light and soil properties in two Mediterranean forests with contrasting soils and climatic conditions. Half the seedlings were subjected to an irrigation treatment during the first year to quantify the effects on performance of an alteration in the summer drought intensity. Linear and non-linear models were parameterized and compared to identify major resources controlling seedling performance. We found both site-specific and general patterns of regeneration. Strong site-specificity was found in the identity of the best predictors of seedling survival: survival decreased linearly with increasing light (i.e. increasing desiccation risk) in the drier site, whereas it decreased logistically with increasing spring soil water content (i.e. increasing waterlogging risk) in the wetter site. We found strong empirical support for multiple resource limitation at the drier site, the response to light being modulated by the availability of soil resources (water and P). Evidence for regeneration niche partitioning among Quercus species was only found at the wetter site. However, at both sites Quercus species shared the same response to summer drought alleviation through water addition: increased first-year survival but not final survival (i.e. after two years). This suggests that extremely dry summers (i.e. the second summer in the experiment) can cancel out the positive effects of previous wetter summers. Therefore, an increase in the intensity and frequency of summer drought with climate change might cause a double negative impact on Quercus regeneration, due to a general reduction in survival probability and the annulment of the positive effects of (infrequent) 'wet' years. Overall, results presented in this study are a major step towards the development of a mechanistic model of Mediterranean forest dynamics that incorporates the idiosyncrasies and generalities of tree regeneration in these systems, and that allow simulation and prediction of the ecological consequences of resource level alterations due to global change.
Type: Journal Article
URI: http://hdl.handle.net/1893/17232
DOI Link: http://dx.doi.org/10.1111/j.1600-0706.2008.16814.x
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Instituto de Recursos Naturales
Instituto de Recursos Naturales
Universidad de Granada, Spain
Biological and Environmental Sciences
Universidad Nacional de Córdoba
Universidad de Granada, Spain
Universidad de Granada, Spain
Instituto de Recursos Naturales

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