Aleppo Pine Regeneration After Fire Along An
Aridity Gradient
Author(s)
J. De las Heras, D. Moya, F. R. López-Serrano, M. Eugenio
& J. M. Espelta
Abstract
In the Mediterranean Basin, the number of large-scale fires and, consequently,
the area of regenerated forests after a fire have been increasing over the last few
decades. Mediterranean pine tree stand regeneration shows differences in growth
and reproductive characteristics depending on site quality. Aleppo pine (Pinus
halepensis Mill.) is an important obligate seeder species occupying a large
surface in this area. In order to study growth and reproductive characteristics
depending on different climatic conditions, six sites with similar characteristics
(edaphic, exposure, slope) burned in the summer of 1994 were selected along a
climate gradient. Different precipitation values determined three different
ombroclimates: dry-subhumid, dry and semi-arid. Ten years after the fires, data
on growth and cone production were collected from these areas in order to study
the pattern of growth and reproduction and the influence of site quality (climate)
on them.
Results showed significantly higher values for growth and several cone
characteristics; furthermore, they were positively related to site quality. Viability
and seed germination percentages were higher in sites located in dry-subhumid
areas. Serotiny was highest in dry locations (southern sites), and lower
percentages were found in low tree density sites. The number of reproductive
trees was higher northwards and the reproductive phase was reached in younger
stands with lower tree density. In conclusion, results showed a geographical
gradient based upon growth and reproductive characteristics, decreasing
southwards in contrast to serotiny, which increases in southern sites. Density was
found to be a significant factor influencing overall pine stand development.
Keywords: climatic gradient; serotiny; reproductive characteristics; site quality.
Keywords
climatic gradient; serotiny; reproductive characteristics; site quality.
Related Book
Other papers in this volume
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