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Poster De Conférence Année : 2010

Climate change impact on tree architecture may contribute to forest decline and dieback

L'impact du changement climatique sur l'architecture des arbres peut contribuer au dépérissement des forêts

Résumé

The impact of repeated droughts on tree architecture was studied in South-eastern France from 1995 to 2010. For all of six studied species, a fall occurred in branching rate, and for concerned species a reduction of polycyclism rate. The size and number of leaves were also significantly reduced. The simplified architecture limits the capacity of trees to explore available space and contributes to a low LAI and crown transparency. For evergreen species, small leaves also limit the potential maximum LAI for 3 to 8 years according to their life span. Together, light architecture and smaller leaves or needles may cut by more than 50% and for several years the potential LAI after repeated bad years. This may contribute to carbon shortage and starvation up to many years after climatic accidents. For some species, long series allowed untangling the relationship between architecture parameters and climate parameters (monthly or seasonal) from current and previous years. The models showed that crown development should be significantly reduced in the future. Architectural parameters appeared to be directly linked to tree vigour, and could be good indicators of tree health. The simplification of architecture can be considered as an early warning of potential dieback.
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Dates et versions

hal-02593444 , version 1 (15-05-2020)

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M. Vennetier, F. Girard, S. Ouarmim, A. Thaabet, C. Ripert, et al.. Climate change impact on tree architecture may contribute to forest decline and dieback. XXIII IUFRO world congress, Aug 2010, Seoul, South Korea. International Forestry Review, 12 (5), pp.45-45, 2010. ⟨hal-02593444⟩
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