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  • The declination of the Quercetea robori-petraeae Braun-Blanq. & Tüxen ex Braun-Blanq., Roussine & Nègre 1952 class is proposed for the new French vegetation prodrome (PVF2). It contains 23 associations, 4 sub-alliances, 8 alliances and 3 orders. This class comes from the spliting of the Querco roboris-Fagetea sylvaticae Braun-Blanq. & Vlieger in Vlieger 1937 “ superclass », which appeared in the first French vegetation prodrome (PVF1, BARDAT et al., 2004). Besides the creation of a separate class, there are very few changes from the first French vegetation prodrome (PVF1, Bardat et al., 2004). This new class corresponds to the PVF1 Quercetalia roboris Tüxen 1931, except that we recognise the order of the Molinio caeruleae- Quercetalia roboris H. Passarge 1968 for the alliance Molinio caeruleae-Quercion roboris Scamoni et H. Passarge 1959 (this alliance was in the Quercetalia roboris in the PVF1). The Quercetalia roboris is increased by two new alliances, a continental one (Agrostio capillaris- Quercion petraeae Scamoni & H.Passarge 1959) and a very oceanic one, the Hymenopyllo tunbrigensis-Quercion roboris Je. Pall. 2000. The PVF1 Hyperico montani-Quercenion robori- petraeae Rameau 1996 nom. inval. is validated here, but as an alliance (Hyperico montani- Quercion petraeae Rameau ex all. nov.). Finally, the Lonicero periclymeni-Betuletalia pubescentis Willner & Mucina in Willner et al. 2016 is added, even if we lack data to propose any association. Key-words Querco roboris-Fagetea sylvaticae Braun-Blanq. & Vlieger in Vlieger 1937, Quercetalia roboris Tüxen 1931, Molinio caeruleae-Quercetalia roboris H. Passarge 1968, beech-oak forest, oak forest, acidophilous deciduous forests.

  • Here is proposed the declination of the Quer- cetea pubescentis Doing-Kraft ex Scamoni & H. Passarge 1959 class, for the second ver- sion of the French vegetation prodrome (PVF2). It contains 35 associations, 9 sub-al- liances, 7 alliances and 3 orders. This class comes from the spliting of the Querco robo- ris-Fagetea sylvaticae Braun-Blanq. & Vlieger in Vlieger 1937 “ superclass », chosen in the first French vegetation prodrome (PVF1, Bar- dat et al. 2004). Three orders compose this class. The Quer- cetalia pubescenti-petraeae Klika 1933 corr. Moravec in Béguin & Theurillat 1984 is the central one, and contains a new alliance for acidophilous white oak forests: the Avev- ello flexuosae-Quercion pubescentis. The Cot- ino coggygriae-Fraxinetalia orni Jakucs 1960 nom. invers propos. gathers mainland ligu- rian and thyrenean forests but also corsican ones. The choice of a third order, the Querco petraeae-Carpinetalia betuli Moor ex R. Boeuf 2014, is the main change between PVF1 and this PVF2. It is based on the Carpinion bet- uli Issler 1931 alliance, reestablished in its original diagnoses as oak-hornbeam forests, without beech because of a too dry climate. In the PVF1, both beech-oak-hornbeam and dry oak-hornbeam forests were put in the Carpinion betuli. For nomenclatural, floris- tical, structural and ecological reasons, dry oak-hornbeam forests are now separated not only from beech-oak-hornbeam for- ests but aslo from oak-hornbeam copices in witch beech has been eliminated by agri- cultural and forestry practices. The Carpin- ion betuli must only be used for “ true » dry oak-hornbeam forests. Beech-oak-horn- beam (including copices) are now con- cerned by the new Carpino betuli-Fagion sylvaticae R. Boeuf, Renaux & J.-M. Royer in R. Boeuf 2011 alliance, witch belongs to another class (see Renaux et al. 2019d). Keywords : Querco roboris-Fagetea sylvati- cae Braun-Blanq. & Vlieger in Vlieger 1937, Carpinion betuli Issler 1931, white-oak for- ests, Quercus pubescens, oak-hornbeam for- ests, supramediterranean, hophornbeam forests.

Dernière mise à jour depuis la base de données : 22/10/2026 09:30 (CEST)

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