Titre : | La végétation pionnière des pannes de dunes situées entre Berck et Merlimont - Pas-de-Calais |
Type de document : | Livre |
Auteurs : | Jean-Roger Wattez, Auteur |
Année de publication : | 1975 |
Article en page(s) : | pp. 117-131 |
Note générale : | Coll. Phytosoc. I - La végétation des dunes maritimes, Paris - 1971 |
Langues : | Français |
Catégories : | [ZG] NORD-PAS-DE-CALAIS (31) [habitats/milieux] 16.2 - Dunes
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Mots-clés : | végétation relevé phytosociologique |
Résumé : | "Scattered amongst coastal sand dunes situated near Merlimont (Pas-de- Calais) exist some moist hollows called PANNES (a flemish name). Their conspicuous vegetation bas been carefully studied; indeed several communities rise gradually one above the other.
The pionneer vegetation of these hollows seems to be either a community of Liverworts (such as Riccia cavernosa) or the Caricetum trinervis, superposed on a dense and continuous carpet of Charophycées.
Actually, the lowest part of these "slacks" is covered by the Samolo-Litorelletum whilst the periphery of them see the optimum development of Ana- gallis tenella and Parnassia palustris. Must be placed that community in the new alliance Anagallido-Juncion recently identified by Dr. J. BRAUN-BLANQUET? a hem where is predominant Blackstonia perfoliata assure a transition between the herbaceous vegetation and the pionneercopsewoods of Salix dunensis and Hippophae rhamnoides.
At last the Centaurio-Saginetum monilifor.mis is a transitionnal commu- nity situated just at the margin of dune slacks (already on a dry sand). FREIJSEN who bas carefully studied it write : "the distribution of C. vulgare depends on the phreatic level and its fluctuations". The ecology of these sociations (all of them become scarce) has also been studied (pH, humidity)." (source : auteur) |
Type de publication : | périodique |
Référence biblio : | Wattez J.-R., 1975 - La végétation pionnière des pannes de dunes situées entre Berck et Merlimont - Pas-de-Calais. Colloques phytosociologiques, 1 : 117-131. |
ID PMB : | 22475 |
Permalink : | http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=22475 |
in Colloques phytosociologiques > vol. 1 (1971) . - pp. 117-131