Comparaison des densités et caractéristiques des cavités arboricoles en forêt boréale suédoise aménagée et non aménagé

Abstract : Tree cavities are major components of the forest ecosystem worldwide as they are required substrate for a large number of species. The present study aimed to provide new knowledge on cavity density and cavity tree characteristics in the Swedish boreal zone where little information exists on this subject. Assessing the impact of forest management on cavity availability was another main goal. My study was conducted in old forests around Umeå, in both managed and unmanaged stands. The mean cavity density in managed forest (1.2 ha-1) was significantly lower than in unmanaged forests (2.5 ha-1). Natural-decay cavities stood for 5.5% of the cavities, while the other 94.5% were excavated. This emphasizes the importance of primary cavity excavators for cavity supply in the Swedish boreal forest. Compared to their density in the forest, deciduous and dead trees were overrepresented as cavity trees. The different cavity densities could then be due to the fact that unmanaged forest presented a higher amount of dead trees and birch. As recorded in previous studies, aspens were overrepresented as cavity trees. My study highlights a negative effect of forest management on cavity availability. Therefore, management strategies should focus on increasing the amount of suitable excavation substrate, meaning standing dead trees and deciduous trees. Particular attention should be paid to the conservation and regeneration of aspen.
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Master thesis
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Sophie Michon. Comparaison des densités et caractéristiques des cavités arboricoles en forêt boréale suédoise aménagée et non aménagé. Sciences de l'environnement. 2014. ⟨hal-02106488⟩

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