| Titre : |
Etude synsystématique des hêtraies pyrénéennes et des régions limitrophes (Espagne et Piémont aquitain) |
| Type de document : |
Tiré à part de revue |
| Auteurs : |
Bernard Comps ; Josette Letouzey ; Jean Timbal |
| Année de publication : |
1986 |
| Importance : |
145-236 |
| Langues : |
Français (fre) |
| Catégories : |
[CBNPMP-Géographique] Aquitaine
[CBNPMP-Géographique] Espagne
[CBNPMP-Géographique] Pyrénées
[CBNPMP-Thématique] Cartes thématiques
[CBNPMP-Thématique] Forêt déciduée (caduque)
[CBNPMP-Thématique] Inventaire floristique
[CBNPMP-Thématique] Relevés phyto-sociologiques
|
| Résumé : |
The phytosociological study of Pyrenean and Iberic beechwoods has shown three sub-alliances of Fagion: Cephalanthero-Fagenion, Scillo-Fagenion and Luzulo-Fagenion. That last one appears to be not homogeneous and composed with two different sub-alliances which are: Luzulo-Fagenion s. str. and Galio-Fagenion (Gamisans 1977), but in a stricter meaning, in west-mediterranean mountains. The Ilici-Fagion alliance, proposed by Braun-Blanquet, may be kept no longer due to the lack of characteristic species. 1. The associations of the Cephalanthero-Fagenion: The Buxo-Fegetum (700 to 1300 m) is located in Spain (Catalonia and Aragon). That association is more thermophilous than calcicolous. It lays at the border of Quercion pubescentis, but its oro-mediterranean characteristics allowed to consider it rather as one of the Cephalanthero-Fagenion. - The Helloboro-Fagetum is the main association of the Pyrenean Cephalanthero-Fagenion, present all along the chain, with a clinal variation from East to West, inducing three subassociations: a typical one in the central Pyrenees, an eastern one with Helleborus foetidus, and a western one with Saxifraga hirsuta, Brachypodium pinnatum and Vincetoxicum officinale. 2. The associations of Scillo-Fagenion (vicariant sub-alliance of the Eu-Fagenion in Southwest Europe): The Fago-Scilletum (= Scillo-Fagetum) is also present all along the Pyrenean chain, at high altitude, on neutrophilous soils. In the western part of its range, Saxifraga hirsuta sub-associations occur. - The Lathyro lutei-Fagetum is only located in the French central part of the Pyrenees. It is very rich in species with a high frequency of Lathyrus luteus and of thermophilous species originating from the collinean stage of vegetation. - The Scolopendrio-Fagetum (500-900 m) takes the place of the Lathyro-fagetum in the western Pyrenees and forms a transition toward the thermophilous Carpinion. - The Melico-Fagetum cantabricum of the Spain Cantabric Sierra seems to be a substitute both to Scillo-Fagetum and Scolopendrio-Fagetum. It looks very much like the Scillo-Fagetum saxifragetosum hirsuti and an accurate phytosociological comparison between these two syntaxons appears to be very necessary. - The Isopyro-Fagetum described in Navarre by Montserrat includes the Lysimachio nemorum-Fagetum of Gruber (1977) and a lot of "relevés" of Timbal, in Ariège (France). It forms a transition to the Luzulo-Fagenion. 3. Mountain acidophilous beechwoods: a) Galio-Fagenion(p.p.) - The Luzulo niveae-Fagetum (1000-1500 m) is located in the eastern part of the Pyrenees. It is the western oro-mediterranean vicariant of the Luzulo albidae-Fagetum (Middle Europe). - The Deschampsio (flexuosae)-Fagetum (1000-1700 m) has been first described in the Massif of Montseny (Spanish Catalonia). It also occurs in the Vallespir valley (French Catalonia). It is constituted of more thermophilous species than the Luzulo niveae-Fagetum. - The Galio (rotundifolii)-Fagetum (1100-1700 m) clusters some upper acid beechwoods in central Spain and the central Pyrenees, in a rather continental climate. b) Luzulo-Fagenion beechwoods - The Luzulo-Fagetum pyrenaïcum (ass. nov. prov.) is floristically poor. It is located on acid soils in the French central Pyrenees. It appears to be a marginal form (floristically impoverished) of the middle European Luzulo-Fagenion. - The Saxifrago hirsutae-Fagetum of the western Pyrenees and of the Cantabrian chain is a mountain, acidophilous association characterized by its atlantic climate and the abundance of Bryophytes. |
| Permalink : |
https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=128821 |
Etude synsystématique des hêtraies pyrénéennes et des régions limitrophes (Espagne et Piémont aquitain) [Tiré à part de revue] / Bernard Comps ; Josette Letouzey ; Jean Timbal . - 1986 . - 145-236. Langues : Français ( fre)
| Catégories : |
[CBNPMP-Géographique] Aquitaine
[CBNPMP-Géographique] Espagne
[CBNPMP-Géographique] Pyrénées
[CBNPMP-Thématique] Cartes thématiques
[CBNPMP-Thématique] Forêt déciduée (caduque)
[CBNPMP-Thématique] Inventaire floristique
[CBNPMP-Thématique] Relevés phyto-sociologiques
|
| Résumé : |
The phytosociological study of Pyrenean and Iberic beechwoods has shown three sub-alliances of Fagion: Cephalanthero-Fagenion, Scillo-Fagenion and Luzulo-Fagenion. That last one appears to be not homogeneous and composed with two different sub-alliances which are: Luzulo-Fagenion s. str. and Galio-Fagenion (Gamisans 1977), but in a stricter meaning, in west-mediterranean mountains. The Ilici-Fagion alliance, proposed by Braun-Blanquet, may be kept no longer due to the lack of characteristic species. 1. The associations of the Cephalanthero-Fagenion: The Buxo-Fegetum (700 to 1300 m) is located in Spain (Catalonia and Aragon). That association is more thermophilous than calcicolous. It lays at the border of Quercion pubescentis, but its oro-mediterranean characteristics allowed to consider it rather as one of the Cephalanthero-Fagenion. - The Helloboro-Fagetum is the main association of the Pyrenean Cephalanthero-Fagenion, present all along the chain, with a clinal variation from East to West, inducing three subassociations: a typical one in the central Pyrenees, an eastern one with Helleborus foetidus, and a western one with Saxifraga hirsuta, Brachypodium pinnatum and Vincetoxicum officinale. 2. The associations of Scillo-Fagenion (vicariant sub-alliance of the Eu-Fagenion in Southwest Europe): The Fago-Scilletum (= Scillo-Fagetum) is also present all along the Pyrenean chain, at high altitude, on neutrophilous soils. In the western part of its range, Saxifraga hirsuta sub-associations occur. - The Lathyro lutei-Fagetum is only located in the French central part of the Pyrenees. It is very rich in species with a high frequency of Lathyrus luteus and of thermophilous species originating from the collinean stage of vegetation. - The Scolopendrio-Fagetum (500-900 m) takes the place of the Lathyro-fagetum in the western Pyrenees and forms a transition toward the thermophilous Carpinion. - The Melico-Fagetum cantabricum of the Spain Cantabric Sierra seems to be a substitute both to Scillo-Fagetum and Scolopendrio-Fagetum. It looks very much like the Scillo-Fagetum saxifragetosum hirsuti and an accurate phytosociological comparison between these two syntaxons appears to be very necessary. - The Isopyro-Fagetum described in Navarre by Montserrat includes the Lysimachio nemorum-Fagetum of Gruber (1977) and a lot of "relevés" of Timbal, in Ariège (France). It forms a transition to the Luzulo-Fagenion. 3. Mountain acidophilous beechwoods: a) Galio-Fagenion(p.p.) - The Luzulo niveae-Fagetum (1000-1500 m) is located in the eastern part of the Pyrenees. It is the western oro-mediterranean vicariant of the Luzulo albidae-Fagetum (Middle Europe). - The Deschampsio (flexuosae)-Fagetum (1000-1700 m) has been first described in the Massif of Montseny (Spanish Catalonia). It also occurs in the Vallespir valley (French Catalonia). It is constituted of more thermophilous species than the Luzulo niveae-Fagetum. - The Galio (rotundifolii)-Fagetum (1100-1700 m) clusters some upper acid beechwoods in central Spain and the central Pyrenees, in a rather continental climate. b) Luzulo-Fagenion beechwoods - The Luzulo-Fagetum pyrenaïcum (ass. nov. prov.) is floristically poor. It is located on acid soils in the French central Pyrenees. It appears to be a marginal form (floristically impoverished) of the middle European Luzulo-Fagenion. - The Saxifrago hirsutae-Fagetum of the western Pyrenees and of the Cantabrian chain is a mountain, acidophilous association characterized by its atlantic climate and the abundance of Bryophytes. |
| Permalink : |
https://biblio.cbnpmp.fr/index.php?lvl=notice_display&id=128821 |
Comps, Bernard, Letouzey, Josette, Timbal, Jean
1986
Etude synsystématique des hêtraies pyrénéennes et des régions limitrophes (Espagne et Piémont aquitain).
Phytocoenologia, 14(2)
: 145-236.
|
14 (2) - 1986 (Phytocoenologia)
Etude synsystématique des hêtraies pyrénéennes et des régions limitrophes (Espagne et Piémont aquitain) / Bernard Comps (1986)