Climate controls act at different scales on the seasonal pattern of Quercus ilex L. stem radial increments in NE Spain |
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Authors: | Emilia Guti??rrez Filipe Campelo J Julio Camarero Montserrat Ribas Elena Munt??n Cristina Nabais Helena Freitas |
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Institution: | (1) Departament d’Ecologia, Facultat de Biologia, Universitat de Barcelona, Av Diagonal, 645, 08028 Barcelona, Spain;(2) CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, PO BOX 3046, 3001-401 Coimbra, Portugal;(3) ARAID, Instituto Pirenaico de Ecolog?a, CSIC, Av Monta?ana, 1005, 50080 Zaragoza, Spain |
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Abstract: | Long-term data on radial increment dynamics in Mediterranean species may identify which climatic variables are the main constraints
for radial growth and at which temporal scales they act. To this end, we examined stem radial fluctuations in Quercus ilex L., the dominant evergreen oak species in the Western Mediterranean Basin, over a period of 11 years (1994–2004) at a coastal
site in north-eastern Spain. We used manual band dendrometers to record girth changes in trees on north- and south-facing
slopes. Annual increments measured by dendrometers showed good agreement with annual tree-ring width. North-facing trees showed
a lower long-term cumulative radial increment than south-facing trees. The seasonal radial increment pattern of Q. ilex was bimodal, being characterized by a greater increase in May and a lesser, more variable increase peak in September. Both
phases corresponded to warm and moist climatic conditions, whereas radial increase of stems stopped in winter and occasionally
in summer. Considering the whole year, mean maximum air temperature was the main factor positively affecting radial increment
of Q. ilex from short- (5 days) to- long (30 days) time scales, whereas the accumulated precipitation exerted a similar effect at longer
(30 days) scales, but only on south-facing trees. In summer, all trees were positively correlated with precipitation at long-time
scales (30 days); however, only stem increment of south-facing trees showed a significant relation to the temperature at short-time
scales (10 days). We confirmed the dominant role of temperature as the major constraint on radial increment at short time
scales, despite most previous studies were mostly biased towards precipitation effects at monthly scales. |
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