Growth response to climate and drought in <Emphasis Type="Italic">Pinus nigra</Emphasis> Arn. trees of different crown classes |
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Authors: | Darío Martín-Benito Paolo Cherubini Miren del Río Isabel Cañellas |
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Institution: | 1.Departamento Sistemas y Recursos Forestales,CIFOR-INIA,Madrid,Spain;2.Swiss Federal Institute for Forest,Snow and Landscape Research WSL,Birmensdorf,Switzerland |
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Abstract: | Tree-ring chronologies were examined to investigate the influence of climate on radial growth of Pinus nigra in southeastern Spain. We addressed whether drought differentially affected the ring-widths of dominant and suppressed trees
and if our results supported the hypothesis that, in a Mediterranean climate, suppressed conifer trees suffer greater growth
reductions than dominant trees. Climate–growth relationships were analyzed using response and correlation functions, whereas
the effect of drought on trees growth was approached by superposed epoch analysis in 10 dry years. A cool, wet autumn and
spring, and/or mild winter enhanced radial growth. Latewood was the most sensitive ring section in both kinds of trees and
it was primarily influenced by current year precipitations. Earlywood was mostly influenced by climatic conditions previous
to the growing season. In general, May was the most influential month. Pinus nigra was shown to be very drought sensitive tree in the study area. Tree-rings in suppressed trees showed lower growth reductions
caused by drought than those of dominant trees. However, dominant trees recovered normal growth faster. Dominant trees showed
a more plastic response, and suppression appeared to reduce the effect of climate on tree radial growth. Some possible causes
for these effects are discussed. Our results support the essential role of the balance between light and moisture limitations
for plant development during droughts and show that it is not appropriate to generalize about the way in which suppression
affects climate-growth relationship in conifers. |
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Keywords: | Black pine Dendroecology Tree suppression Intraspecific competition Southeastern Spain |
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