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Fructification du Hêtre et des Chênes en France : rôle des températures, du pollen et du bilan de carbone et relation avec la croissance des peuplements

Abstract : We aimed at identifying which drivers control the spatio-temporal variability of fruit production in three major European temperate deciduous tree species: Quercus robur, Quercus petraea and Fagus sylvatica. We analysed the relations of fruit production with airborne pollen, carbon and water resources and meteorological data in 48 French forests (RENECOFOR Network) over 14 years (1994-2007). In oak, fruit production averaged 251 kg ha-1 yr-1 and 174 kg ha-1 yr-1 for beech. A fruit-bearing cycle with a two-year return period appeared in beech. Oak fruit production appeared highly variable over the years for a given stand as well as across stands. It was mainly related to temperature conditions during the pollen emission period (at the beginning of April), supporting the pollen synchrony hypothesis. In beech, the production was highly related to the temperature signal over the two previous years which eclipsed the airborne pollen load. Fruit production in Quercus and Fagus was related to climate drivers, carbon inputs and airborne pollen through strongly nonlinear, genus-specific relations. Quercus and Fagus also differed as regards the secondary growth vs fructification trade-off. While negative relationships were observed between secondary growth and fruit production in beech, more productive years benefited to both secondary growth and reproductive effort in oak.
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Contributor : François Lebourgeois <>
Submitted on : Thursday, November 28, 2019 - 11:16:46 AM
Last modification on : Wednesday, September 16, 2020 - 5:35:36 PM

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François Lebourgeois, Nicolas Delpierre, Eric Dufrene, Sébastien Cecchini, Sébastien Macé, et al.. Fructification du Hêtre et des Chênes en France : rôle des températures, du pollen et du bilan de carbone et relation avec la croissance des peuplements. Revue Forestière Française, Ecole nationale du génie rural, 2019, pp.1-29. ⟨10.4267/2042/70518⟩. ⟨hal-02384139⟩

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