{"id":24418,"date":"2025-07-25T13:20:15","date_gmt":"2025-07-25T11:20:15","guid":{"rendered":"https:\/\/news.save.ch\/?p=24418"},"modified":"2025-08-06T13:23:15","modified_gmt":"2025-08-06T11:23:15","slug":"stadtbaeume-kuehlen-auch-bei-extremer-hitze","status":null,"type":"post","link":"https:\/\/news.save.ch\/fr\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\/","title":{"rendered":"Les arbres urbains rafra\u00eechissent m\u00eame en cas de chaleur extr\u00eame"},"content":{"rendered":"
\"\"<\/a>
Place de la banlieue genevoise de Lancy : l'essai a eu lieu sur ces huit platanes. (Photo : Christoph Bachofen)<\/figcaption><\/figure>\n

Lorsque le soleil tape, les arbres urbains rafra\u00eechissent l'environnement en faisant \u00e9vaporer de l'eau par leurs feuilles. Face \u00e0 l'augmentation attendue des vagues de chaleur, comme le pr\u00e9voient les mod\u00e8les climatiques, ils contribuent de mani\u00e8re d\u00e9cisive \u00e0 maintenir la qualit\u00e9 de vie dans les villes. Mais les arbres atteignent aussi leurs limites \u00e0 un moment donn\u00e9 : si la temp\u00e9rature des feuilles d\u00e9passe 30 \u00e0 35 \u00b0C, la photosynth\u00e8se ne fonctionne plus - les pores des feuilles se ferment pour \u00e9viter la perte d'eau.<\/p>\n

Une \u00e9quipe de recherche de l'Institut f\u00e9d\u00e9ral de recherches sur la for\u00eat, la neige et le paysage (WSL) et de l'EPFL a \u00e9tudi\u00e9 de mani\u00e8re cibl\u00e9e le comportement des platanes dans des conditions extr\u00eames - avec un r\u00e9sultat surprenant : les arbres ont continu\u00e9 \u00e0 \u00e9vaporer beaucoup plus d'eau que pr\u00e9vu, m\u00eame \u00e0 des temp\u00e9ratures sup\u00e9rieures \u00e0 39 \u00b0C, et ont ainsi efficacement refroidi l'environnement. Le responsable de l'\u00e9tude, Christoph Bachofen, et son \u00e9quipe ont install\u00e9 au printemps 2023 des appareils de mesure sur huit platanes de la banlieue genevoise de Lancy. Les capteurs ont enregistr\u00e9 le flux de s\u00e8ve dans les troncs, ce qui permet de tirer des conclusions sur la quantit\u00e9 d'eau \u00e9vapor\u00e9e et donc sur la puissance de refroidissement. Cet \u00e9t\u00e9-l\u00e0, Gen\u00e8ve a justement connu deux vagues de chaleur avec des temp\u00e9ratures records, atteignant pr\u00e8s de 40 \u00b0C. Les plants ont \u00e9t\u00e9 arros\u00e9s d'eau chaude, ce qui a permis de r\u00e9duire la consommation d'\u00e9nergie.<\/p>\n

Comment les arbres r\u00e9agissent aux conditions extr\u00eames<\/h3>\n

Contrairement \u00e0 ce que l'on attendait, les arbres n'ont pas cess\u00e9 leur flux d'eau - au contraire, il a m\u00eame augment\u00e9 avec la chaleur croissante, bien que l'air soit extr\u00eamement sec au m\u00eame moment. \"Il est \u00e9vident que nous n'avons pas encore compl\u00e8tement compris comment les arbres r\u00e9agissent \u00e0 des conditions extr\u00eames\", explique Bachofen. Les chercheurs supposent que des r\u00e9serves d'eau profondes dans le sol ont notamment aid\u00e9 les platanes.<\/p>\n

L'ampleur du flux d'eau a \u00e9t\u00e9 surprenante et soul\u00e8ve des questions importantes : Si les arbres r\u00e9agissent diff\u00e9remment \u00e0 la chaleur que ce que l'on pensait jusqu'\u00e0 pr\u00e9sent, les pr\u00e9visions concernant leur effet de refroidissement sont \u00e9galement impr\u00e9cises - et les mod\u00e8les permettant de pr\u00e9dire la r\u00e9partition future de la chaleur dans les villes ne seraient pas fiables.<\/p>\n

Le fait que les arbres \u00e9vaporent beaucoup d'eau, m\u00eame en cas de chaleur extr\u00eame, est une bonne nouvelle pour le climat urbain. \"Les jours o\u00f9 la temp\u00e9rature d\u00e9passe 30 degr\u00e9s Celsius sont de plus en plus fr\u00e9quents\", explique Bachofen. La prochaine \u00e9tape importante pour la recherche est maintenant de d\u00e9couvrir avec quelle efficacit\u00e9 d'autres esp\u00e8ces d'arbres transpirent \u00e9galement sous une chaleur extr\u00eame. Cela permettrait de d\u00e9velopper des recommandations sur les esp\u00e8ces qui peuvent non seulement faire face \u00e0 la pollution atmosph\u00e9rique et au sel de d\u00e9neigement, mais aussi aux fortes chaleurs. Car la capacit\u00e9 de refroidissement n'est qu'une des nombreuses t\u00e2ches que les arbres urbains assument - mais elle deviendra de plus en plus importante \u00e0 l'avenir.<\/p>","protected":false},"excerpt":{"rendered":"

Wenn die Sonne brennt, k\u00fchlen Stadtb\u00e4ume die Umgebung, indem sie Wasser \u00fcber ihre Bl\u00e4tter verdunsten. Angesichts der zu erwartenden Zunahme von Hitzewellen, wie Klimamodelle vorhersagen, tragen sie entscheidend dazu bei, St\u00e4dte lebenswert zu halten. B\u00e4ume stossen jedoch irgendwann auch an ihre Grenzen: Steigen die Blatttemperaturen \u00fcber 30 bis 35 \u00b0C, funktioniert die Fotosynthese nicht mehr […]<\/p>\n","protected":false},"author":31,"featured_media":24419,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[3314],"tags":[6600,6601,6599],"class_list":["post-24418","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-health-safety","tag-baeume","tag-beschattung","tag-extremhitze"],"acf":[],"hkrextid":null,"publication":null,"issue":null,"workflow":null,"startPage":null,"spitzmarke":null,"_posts_by_tag_page_fields":null,"_at_widget":null,"_yoast_wpseo_primary_category":"3314","_yoast_wpseo_focuskw_text_input":null,"_yoast_wpseo_opengraph-image":null,"_yoast_wpseo_opengraph-description":null,"_yoast_wpseo_opengraph-title":null,"enclosure":null,"_yoast_wpseo_twitter-title":null,"_yoast_wpseo_twitter-description":null,"_yoast_wpseo_twitter-image":null,"_wp_old_slug":null,"_yoast_wpseo_title":null,"_yoast_wpseo_canonical":null,"yoast_head":"\nStadtb\u00e4ume k\u00fchlen auch bei extremer Hitze - Save<\/title>\n<meta name=\"description\" content=\"Platanen in St\u00e4dten leisten selbst bei grosser Hitze noch einen wichtigen Beitrag zur Abk\u00fchlung \u2013 das zeigt eine neue Studie.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/news.save.ch\/fr\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Stadtb\u00e4ume k\u00fchlen auch bei extremer Hitze - Save\" \/>\n<meta property=\"og:description\" content=\"Platanen in St\u00e4dten leisten selbst bei grosser Hitze noch einen wichtigen Beitrag zur Abk\u00fchlung \u2013 das zeigt eine neue Studie.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/news.save.ch\/fr\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\/\" \/>\n<meta property=\"og:site_name\" content=\"Save\" \/>\n<meta property=\"article:published_time\" content=\"2025-07-25T11:20:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-08-06T11:23:15+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/news.save.ch\/wp-content\/uploads\/2025\/08\/IMG_5654-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1400\" \/>\n\t<meta property=\"og:image:height\" content=\"1050\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"stefanie Zeng\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"stefanie Zeng\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/news.save.ch\\\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/news.save.ch\\\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\\\/\"},\"author\":{\"name\":\"stefanie Zeng\",\"@id\":\"https:\\\/\\\/news.save.ch\\\/de\\\/#\\\/schema\\\/person\\\/10917387362b3961e882740f6cf6f2a2\"},\"headline\":\"Stadtb\u00e4ume k\u00fchlen auch bei extremer Hitze\",\"datePublished\":\"2025-07-25T11:20:15+00:00\",\"dateModified\":\"2025-08-06T11:23:15+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/news.save.ch\\\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\\\/\"},\"wordCount\":411,\"publisher\":{\"@id\":\"https:\\\/\\\/news.save.ch\\\/de\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/news.save.ch\\\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/news.save.ch\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/IMG_5654-scaled.jpg\",\"keywords\":[\"B\u00e4ume\",\"Beschattung\",\"Extremhitze\"],\"articleSection\":[\"HEALTH & SAFETY\"],\"inLanguage\":\"fr-FR\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/news.save.ch\\\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\\\/\",\"url\":\"https:\\\/\\\/news.save.ch\\\/stadtbaeume-kuehlen-auch-bei-extremer-hitze\\\/\",\"name\":\"Stadtb\u00e4ume k\u00fchlen auch bei extremer Hitze - 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