Browsing by Subject "Fuego"

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    Desarrollo de la vegetación y periodicidad de incendios forestales
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 1986) Samo Lumbreras, A.; Facultad de Biología
    In the Spanish district of VaIencia an average of 15.000 Ha of vegetation are burned out every year. This actually accounts for ca. 4% of the provine's forest resources in spite of the very strong efforts being made in order to both prevent forest fires and lower in size the burned out areas. Under these circumstances, the questions which would normally be made as to the reasons for the no decrese in the affected areas are: Are there insuficient extinguishing means to be blamed for this problem? Are there more o less variable weather conditions prone to bnng about the fires? 1s it that the vegetation of the province (which in fact is the resource destroyed by fire) is exhibiting such a degree of flammability or burnability that renders the catastrophic fires unavoidable? The above are the reasons whch we are planning to look into and consider in detail in order to better understand bosh the forest fire evolution and the factors involved in such a natural element as fire, which in fact is shaping the vegetation of Mediterranean ecosystems.
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    Lack of hard-seeded species in pre-fire and post-fire seed banks in the region of Murcia (south-eastern Spain)
    (Murcia: Universidad de Murcia, Servicio de Publicaciones, 2005) Buhk, Constanze; Hensen, Isabell; Sin departamento asociado; Facultad de Biología
    Permanent seed banks are thought to be of essential importance for the reproductive success of many obligate seeder species during early post-fire succession. To evaluate the role of seed banks for post-fire regeneration in SE Spain, seed bank analyses were carried out on recently burnt sites and in long-unburnt areas in two climatically different regions of the province of Murcia, using the seedling emergence method as well as the physical separation technique. We found great variability in the number of seeds between sites and expositions. Lowest seed numbers were found in the mountains while locally very dense seed banks of > 3500 seeds/m2 in the upper two cm of soil were present at the coast. Species of Poaceae, Asteraceae as well as annual species such as Asterolinum linum-stellatum prevailed whereas hard-seeded species known to occur frequently in post-fire Mediterranean vegetation (e.g. Cistaceae, Fabaceae or Convolvulaceae) were sparse or absent in the seed bank. We conclude that the hard-seeded species are not a self-evident compound of the species composition during post-fire succession of long-unburnt sites in south-eastern Spain.