THREE NEW PLANT ASSOCIATIONS IN THE MIDDLE-EUROPEAN FORESTS OF FRANCE: DESCHAMPSIO CESPITOSAE-FAGETUM SYLVATICAE, SORBO ARIAE-QUERCETUM PETRAEAE AND CARICI BRIZOIDIS-FRAXINETUM EXCELSIORISOriginal Title (non-English) TROIS ASSOCIATIONS VEGETALES NOUVELLES DES FORETS DU DOMAINE MEDIO-EUROPEEN FRANCAIS : DESCHAMPSIO CESPITOSAE-FAGETUM SYLVATICAE, SORBO ARIAE-QUERCETUM PETRAEAE ET CARICI BRIZOIDIS-FRAXINETUM EXCELSIORIS [French]

摘要

This article proposes the validation of 3 plant associations described or referred to by Rameau and in several national and regional synopses (Rameau, 1996 and 1997; Rameau et al., 2000; Bensettiti et aL, 2001; Royer et al., 2006). Deschampsio cespitosae-Fagetum sylvaticae (Rameau 1996) Renaux, Boeuf and Royer ass. nov. is very common on the silt deposits in north-eastern France. It corresponds to the Poo chaixii-Fagetum sylvaticae Rameau 1996 nom. inval., a well-known but so far not validly published syntaxon. It is the central association for Carpino betuli-Fagion sylvaticae Boeuf and Renaux in Boeuf (2010) also proposed in this issue. Sorbo ariae-Quercetum petraeae Rameau (1974, 1996) Renaux, Royer and Boeuf ass. nov. is connected with calcareous hills and is principally characterized by climate (the dry climate of the hills of Burgundy and adjacent areas). This poorly known association belongs to the Carpinion betuli Issler 1931 alliance. As for the third, named Carici brizoidis-Fraxinetum excelsioris (Oberdorfer 1957) Renaux, Boeuf and Royer ass. nov., it is characterised by pedunculate oak stands on hydromorphic silts classified in Fraxino excelsioris-Quercion roboris Pass. et Hofm. 1968. In addition to being based on bibliographical data bases, our results are supported by the use of 9 760 releves distributed throughout France and rely on a fidelity index that documents the choice of the combination of characteristic species.