Abstract
A comparative study was carried out among stands of Pinus uncinata Ram. located, respectively, in La Massana (Andorra) and in the Catalonian Pyrenees, and give these sites an important role against snow avalanches. To check if there exist some differential attributes between Andorran and Catalonian sites, a dendrometric database was generated from sampling (Andorra) and from the information provided by the Third Forest National Inventory (Catalonian Pyrenees). As for their tendency towards uneven-aged stand structure, both geographical regions are quite similar. In fact, stand regeneration is not associated to other stocking variables, and stand stocking is not closely linked to the altitudinal gradient (which little affects mortality). However, Catalonian stands have shown less stocking and, in general, they offer worse characteristics for their protective role against avalanches compared with the Andorran stands.
Highlights
If there exist some differential attributes between Andorran and Catalonian sites, a dendrometric database was generated from sampling (Andorra) and from the information provided by the Third Forest National Inventory (Catalonian Pyrenees)
Stand regeneration is not associated to other stocking variables, and stand stocking is not closely linked to the altitudinal gradient
Catalonian stands have shown less stocking and, in general, they offer worse characteristics for their protective role against avalanches compared with the Andorran stands
Summary
Los bosques ejercen un papel protector de primer orden en lo referente a evitar el desencadenamiento de avalanchas de nieve, siendo la espesura creciente de la masa, tanto a nivel del recubrimiento de las copas del arbolado sobre el suelo como sobre todo por la aportación de los troncos (en número y dimensión), el aspecto que más contribuye. Al objeto de poder diagnosticar la funcionalidad de las masas arboladas de Andorra como fijadoras del manto de nieve, Solé et al (2009) elaboraron una tipología de enfoque silvogenético, donde se identifican trece tipos estructurales distintos en relación a su papel protector frente a los aludes. En el presente trabajo se pretende llevar a cabo una primera exploración comparativa entre los bosques de ambas zonas a fin de: (i) detectar si existen diferencias estructurales y de ello se deriva una funcionalidad distinta frente a los aludes, (ii) establecer si las posibles diferencias identificadas responden más a particularidades ambientales propias de cada ámbito geográfico que a factores antrópicos (gestión selvícola, etc.), y (iii) clasificar las masas catalanas con la misma tipología que se elaboró para las de Andorra
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