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ScienceDaily_2014 00989.txt

#Biodiversity does not always improve resistance of forest ecosystems to droughtscientists from INRA in collaboration with WSL (Switzerland) and European colleagues studied the resistance of forests to drought according to the diversity of tree species. Due to climate change parts of the world will face droughts that will affect forest health. Scientists from INRA in collaboration with WSL 1 (Switzerland) and European colleagues studied the resistance of forests to drought according to the diversity of tree species. Contrary to what was accepted commonly by scientists species diversity does not systematically improve tree resistance to drought in forest ecosystems. This result is published in the PNAS on 29 september 2014. The extreme events induced by climate change will have drastic consequences on forest functions and services and may bring about important drought-induced die off events. It is known however that biodiversity can promote forest ecosystem performance and resistance to insect pests and diseases but whether or not diverse forests are adapted also better to deal with drought stress remains unknown. To shed more light on the effects of biodiversity on the resistance of European forests to drought scientists from INRA in collaboration with WSL and European colleagues studied 160 forest stands with a variety of tree diversity levels from monocultures to five species mixtures across Europe (Spain Italy Romania Poland Germany. For every region we compared monocultures to mixed forests (up to 5 tree species) and looked at their respective capacity to resist to drought explains Damien Bonal who led the research at INRA. This study shows that mixed species forests are more resistant to drought stress than monocultures in some regions only: tree diversity may afford resistance to drought stress only in drought-prone areas i e. in regions where the frequency and severity of drought during the growing season is high. Therefore managing forest ecosystems for high tree species diversity alone does not necessarily ensure forest adaptability to possible future severe drought events. Bonal concludes: It might be of great importance to consider species identities and local climatic conditions and not solely the degree of diversity in the mixtures to obtain complementary use of resources and thus maintain ecosystem functions under drought stress. Story Source: The above story is provided based on materials by INRA-France. Note: Materials may be edited for content and length. Journal Reference e

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