{"id":46881,"date":"2026-10-14T15:22:21","date_gmt":"2026-10-14T13:22:21","guid":{"rendered":"https:\/\/foretnature.be\/?post_type=resume-foret-mail&p=46881"},"modified":"2026-10-14T15:22:37","modified_gmt":"2026-10-14T13:22:37","slug":"secheresse-2026-les-forets-wallonnes-sous-haute-tension","status":"publish","type":"resume-foret-mail","link":"https:\/\/foretnature.be\/en\/resume-foret-mail\/secheresse-2026-les-forets-wallonnes-sous-haute-tension\/","title":{"rendered":"S\u00e9cheresse 2026 : les for\u00eats wallonnes sous haute tension"},"content":{"rendered":"

Dans un bilan publi\u00e9 le 15 septembre 2026, l’Observatoire wallon de la sant\u00e9 des for\u00eats (OWSF, SPW ARNE) d\u00e9crit un \u00e9t\u00e9 marqu\u00e9 par trois vagues de chaleur. Selon le r\u00e9seau PAMESEB du CRA-W, juillet 2026 \u00e9gale 2022 comme mois le plus sec des 26 derni\u00e8res ann\u00e9es. Enfin, les orages du 19 ao\u00fbt ont surtout ruissel\u00e9, sans recharger les sols.<\/p>\n

L’UCLouvain (Earth and Life Institute) suit en temps r\u00e9el quatre placettes de douglas en Ardenne : humidit\u00e9 du sol, accroissement, teneur en eau du bois et flux de s\u00e8ve. Les sols sont extr\u00eamement secs sur 30 cm, et trois placettes ont atteint le point de fl\u00e9trissement, ce qui accro\u00eet le risque d’embolie. Le feuillage jaunit et tombe pr\u00e9cocement depuis fin juillet. Les peuplements affaiblis deviennent plus sensibles aux pathog\u00e8nes et aux ravageurs. Apr\u00e8s les 3 300 ha br\u00fbl\u00e9s dans les Hautes Fagnes, l’OWSF pr\u00e9pare un suivi sanitaire post-incendie.<\/p>\n

L’OWSF et l’ULi\u00e8ge (Laboratoire de Climatologie et de Topoclimatologie) compl\u00e8tent le SPEI-3 (Standardized Precipitation-Evapotranspiration Index), indicateur de r\u00e9f\u00e9rence, avec le SREW, qui int\u00e8gre la capacit\u00e9 de r\u00e9tention en eau des sols. Celui-ci montre que la Fagne-Famenne-Calestienne \u00e9tait en stress physiologique d\u00e8s fin avril. Au 30 juin, toutes les zones bioclimatiques l’\u00e9taient, et elles le restaient fin ao\u00fbt.<\/p>\n

L\u2019OWSF d\u00e9conseille les exploitations pr\u00e9cipit\u00e9es. Elle recommande de maintenir un couvert continu, de limiter les pr\u00e9l\u00e8vements, de conserver un sous-\u00e9tage protecteur, de prot\u00e9ger les sols gr\u00e2ce aux cloisonnements, d’adapter les essences \u00e0 la station et d’int\u00e9grer la r\u00e9silience climatique dans chaque d\u00e9cision sylvicole.<\/p>","protected":false},"excerpt":{"rendered":"

Dans un bilan publi\u00e9 le 15 septembre 2026, l’Observatoire wallon de la sant\u00e9 des for\u00eats (OWSF, SPW ARNE) d\u00e9crit un \u00e9t\u00e9 marqu\u00e9 par trois vagues de chaleur. Selon le r\u00e9seau PAMESEB du CRA-W, juillet 2026 \u00e9gale 2022 comme mois le plus sec des 26 derni\u00e8res ann\u00e9es. Enfin, les orages du 19 ao\u00fbt ont surtout ruissel\u00e9, […]<\/p>\n","protected":false},"featured_media":46882,"template":"","categories":[50],"class_list":["post-46881","resume-foret-mail","type-resume-foret-mail","status-publish","has-post-thumbnail","hentry","category-foret-mail"],"acf":[],"yoast_head":"\nS\u00e9cheresse 2026 : les for\u00eats wallonnes sous haute tension - For\u00eat.Nature<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/foretnature.be\/en\/resume-foret-mail\/secheresse-2026-les-forets-wallonnes-sous-haute-tension\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"S\u00e9cheresse 2026 : les for\u00eats wallonnes sous haute tension - For\u00eat.Nature\" \/>\n<meta property=\"og:description\" content=\"Dans un bilan publi\u00e9 le 15 septembre 2026, l’Observatoire wallon de la sant\u00e9 des for\u00eats (OWSF, SPW ARNE) d\u00e9crit un \u00e9t\u00e9 marqu\u00e9 par trois vagues de chaleur. 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