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Caractérisation de la croissance des chênaies pédonculées atlantiques dépérissantes : effets des sécheresses et relation avec l’architecture des houppiers

Abstract : The relations between crown architecture (healthy, resilient, dying trees; the ARCHI [architectural tree analysis method] Protocol), radial growth and climate (1950-2009) were investigated on 94 pedunculate (Quercus robur L.) oaks sampled in Western France, living in comparable site conditions (acidic soil with a 120 mm water reserves in the subsoil)) and similarly managed (H0 = 24 m; G = 25 m2/ha; no thinning since 2003). While the differences in growth levels according to crown architecture as observed in 2010 appear to go back a long time, the growth curves have consistently diverged more and more over time, in particular following the droughts of 1976 and 1989-1990. An analysis of the growth ring/climate relationship shows that abundant rainfall in December and April contributes to the formation of wider rings whereas water shortages in the summer have a strong opposite effect and one that is intensified in the case of degraded crowns. A comparison of the responses for the 1950-1980 and 1981-2009 periods shows that dying trees were always very susceptible to summer and spring water shortages (from May to July), whereas for the healthy and resilient trees, susceptibility to summer drought has increased very strongly in the recent period. This suggests that the response of all oak stands to the intensification of environmental stresses (increasingly frequent drought) is becoming more homogeneous. Over the 2003-2009 period, all three morphotypes exhibited the same resistance (i.e., the ability to maintain a growth level while subject to a stress). Concerning resilience, the trees characterised as resilient from an architectural standpoint also appeared resilient in terms of growth, showing an ability to return to the pre-crisis level of growth, or even a higher level.
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https://hal-agroparistech.archives-ouvertes.fr/hal-01598643
Contributor : David Gasparotto <>
Submitted on : Friday, September 29, 2017 - 5:43:32 PM
Last modification on : Wednesday, March 10, 2021 - 3:33:54 AM

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François Lebourgeois, Christophe Drénou, Marine Bouvier, Jean Lemaire. Caractérisation de la croissance des chênaies pédonculées atlantiques dépérissantes : effets des sécheresses et relation avec l’architecture des houppiers. Revue forestière française, AgroParisTech, 2015, pp. 333-351. ⟨10.4267/2042/59289⟩. ⟨hal-01598643⟩

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