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Biodiversité et gestion des risques biotiques en forêt de plantation

Abstract : Plantation forests are increasingly contributing to the world forest economy but these tree monocultures are more prone to pest damage. Recent meta-analyses have shown that tree species grown as pure stand are on average 30% more damaged by insect pests than the same species grown as mixed stands. Two main mechanisms can explain this pattern of associational resistance in more diverse forests: 1) the presence of non-host tree species can reduce the availability of host tree to main pest insects and also can disrupt the visual and olfactory cues that they utilise for identifying and colonising host trees; 2) mixed forests provide more diverse and abundant feeding and nesting resources to natural enemies thus allowing a better biological control on insect herbivores. Due to these processes, mixed forests are more resistant to specialized than generalist insect herbivores and the magnitude of resistance increases with increasing functional or phylogenetic contrasts amongst associated tree species. The diversity - resistance relationships pave the way for designing new, mixed tree plantations for the sustainable delivery of forest goods and services.
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  • HAL Id : hal-02634829, version 1
  • PRODINRA : 284039

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Herve Jactel, Luc Barbaro, Bastien Castagneyrol, Anne-Maïmiti Dulaurent, Brice Giffard, et al.. Biodiversité et gestion des risques biotiques en forêt de plantation. Innovations Agronomiques, INRAE, 2014, 41, pp.57-67. ⟨hal-02634829⟩

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