{"id":9578,"date":"2025-04-27T15:40:35","date_gmt":"2025-04-27T13:40:35","guid":{"rendered":"https:\/\/lecompagnonrouge.fr\/?p=9578"},"modified":"2025-08-04T17:19:24","modified_gmt":"2025-08-04T15:19:24","slug":"alnus-glutinosa-vergne","status":"publish","type":"post","link":"https:\/\/lecompagnonrouge.fr\/?p=9578","title":{"rendered":"Alnus glutinosa. Vergne"},"content":{"rendered":"\n

Les aulnes se reconnaissent assez bien \u00e0 leurs fructifications \u00e9voquant des sortes de petites pommes de pins. Alnus glutinosa est assez facile \u00e0 identifier.<\/p>\n\n\n\n

Il se distingue car ses feuilles sont obtuses ou m\u00eame \u00e9margin\u00e9es<\/a>. Si (en plus) les p\u00e9doncules<\/a> de ses fruits sont longs … C’est bien lui!!<\/p>\n\n\n\n

\"Alnus<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n

Risque de confusions n\u00e9anmoins possible avec des hybrides.<\/p>\n\n\n\n

MORPHOGENESE.<\/p>\n\n\n\n

Arbre assez curieux sous nos climats … Il poss\u00e8de un tronc unique. Sa croissance est continue, en particulier l’\u00e9mission des branches qui se trouvent alors dispos\u00e9es presque ici ou l\u00e0 … Ce qui n’est pas sans lui donner un certain charme. <\/p>\n\n\n\n

Les branches s’orientent vers le haut (orthotropie). Lorsque les branches s’orientent vers le haut, les branches secondaires partent du bas des branches primaires et s’orientent vers le haut, et ainsi de suite. Si toutefois une branche secondaire part du haut d’une branche primaire, elle formera ce qu’on appelle au jardin un \u00ab\u00a0gourmand\u00a0\u00bb, et aura valeur d’un tronc (avec le risque d’aspiration d’une grande partie de s\u00e8ve).<\/p>\n\n\n\n

Ses fleurs et fruits n’apparaissent pas en bout de rameaux mais sur les c\u00f4t\u00e9s. C’est une forme tr\u00e8s cousine d’une morphog\u00e9n\u00e8se tr\u00e8s courante car sans doute tr\u00e8s efficace, la morphologie en Rauh, laquelle est \u00e0 croissance rythmique. Ici, cette morphog\u00e9n\u00e8se est dite en Attims.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

<\/p>\n\n\n\n

Origine et taxonomie.<\/strong><\/h2>\n\n\n\n

Pal\u00e9otemp\u00e9r\u00e9 (h\u00e9misph\u00e8re nord: Europe et Russie)<\/p>\n\n\n\n

Fagales<\/a>>Betulaceae<\/a>>Alnus<\/a> glutinosa<\/p>\n\n\n\n

Ecologie.<\/strong><\/p>\n\n\n\n

Beaucoup de Betulaceae ont un pollen allerg\u00e8ne (au moins en r\u00e9action crois\u00e9e).<\/p>\n\n\n\n

Arbre des bords des cours et plans d’eau pour beaucoup.<\/p>\n\n\n\n

La plante poss\u00e8de des sortes de grosses nodulations sur les racines qui lui permette une respiration dans un milieu trop anoxique, noy\u00e9, et o\u00f9 la nitrification est difficile. Une bact\u00e9rie du genre Frankia vit en symbiose avec les plantes du genre Alnus, ce qui lui permet un apport en azote.<\/p>\n\n\n\n

N\u00e9anmoins, noter que Jean-Claude Rameau indique que ce bel arbre se trouve aussi en situation bien plus s\u00e8che (il lui donne un optimum m\u00e9sohygrophile) et indique son comportement pionnier.<\/p>\n\n\n\n

Bois caducifoli\u00e9s hygrophiles \u00e0 amphibies. \u03c3A Fraxino excelsioris – Alnetalia glutinosae Julve 1993<\/p>\n\n\n\n

Economie<\/strong><\/p>\n\n\n\n

Son bois r\u00e9put\u00e9 difficilement putrescible si restant dans une humidit\u00e9 constante et suffisante, aurait servi \u00e0 confectionner des drains et tuyaux.<\/p>\n\n\n\n

Ligneux fourrager.<\/p>\n\n\n\n

Foto ci \u00cele-Saint-Denis. La g\u00e9ologie de ce parc (selon les couches harmonis\u00e9es du site BRGM infoterre) pr\u00e9sente du sable de Beauchamps et du sable du val d\u2019Oise (ou d\u2019Auvers), coup\u00e9e d\u2019une large langue de calcaire de Saint-Ouen. Ici, en bordure du petit bras de la Seine: pour le sous-sol, des sables de Beauchamps, et des alluvions r\u00e9cent, tr\u00e8s certainement.<\/p>\n\n\n\n

\"\"<\/figure>\n","protected":false},"excerpt":{"rendered":"

Les aulnes se reconnaissent assez bien \u00e0 leurs fructifications \u00e9voquant des sortes de petites pommes de pins. Alnus glutinosa est assez facile \u00e0 identifier. Il se distingue car ses feuilles sont obtuses ou m\u00eame \u00e9margin\u00e9es. Si (en plus) les p\u00e9doncules de ses fruits sont longs … C’est bien lui!! Risque de confusions n\u00e9anmoins possible avec…<\/p>\n","protected":false},"author":1,"featured_media":9579,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1145,652],"tags":[1144,1143,1142],"class_list":["post-9578","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-alnus-glutinosa","category-betulaceae","tag-aulne","tag-aulne-glutineux","tag-vergne"],"yoast_head":"\nAlnus glutinosa. 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