{"id":130,"date":"2026-09-29T11:59:39","date_gmt":"2026-09-29T11:59:39","guid":{"rendered":"https:\/\/naturavox.org\/?p=130"},"modified":"2026-09-29T12:00:40","modified_gmt":"2026-09-29T12:00:40","slug":"la-foret-francaise-poursuit-sa-progression-lign-met-deux-siecles-de-reconquete-en-cartes","status":"publish","type":"post","link":"https:\/\/naturavox.org\/index.php\/2026\/09\/29\/la-foret-francaise-poursuit-sa-progression-lign-met-deux-siecles-de-reconquete-en-cartes\/","title":{"rendered":"La for\u00eat fran\u00e7aise poursuit sa progression : l\u2019IGN met deux si\u00e8cles de reconqu\u00eate en cartes"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>La progression des surfaces foresti\u00e8res fran\u00e7aises est un ph\u00e9nom\u00e8ne bien document\u00e9. L\u2019atlas 2026 de l\u2019IGN vient le confirmer et lui donner toute sa dimension : avec 17,6 millions d\u2019hectares dans l\u2019Hexagone et en Corse, la for\u00eat occupe presque deux fois plus d\u2019espace qu\u2019au XIXe si\u00e8cle. Un remarquable travail de cartographie \u00e9claire cette transformation de nos paysages.<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La for\u00eat fran\u00e7aise gagne du terrain. Pour ceux qui suivent le sujet, le constat n\u2019est pas une surprise. Les inventaires forestiers d\u00e9crivent depuis longtemps cette expansion, engag\u00e9e au XIXe si\u00e8cle. L\u2019atlas 2026 de l\u2019Institut national de l\u2019information g\u00e9ographique et foresti\u00e8re (IGN) apporte une nouvelle confirmation de cette tendance et permet surtout d\u2019en mesurer l\u2019ampleur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">De 8,9 millions d\u2019hectares en 1840, les surfaces foresti\u00e8res sont pass\u00e9es \u00e0 17,6 millions d\u2019hectares dans l\u2019Hexagone et en Corse. Elles couvrent d\u00e9sormais pr\u00e8s d\u2019un tiers du territoire. Et cette reconqu\u00eate se poursuit : l\u2019Institut fait \u00e9tat d\u2019une progression moyenne de 90 000 hectares par an, soit plus de huit fois la superficie de Paris.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"752\" height=\"1024\" src=\"https:\/\/naturavox.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-29-a-13.47.20-752x1024.png\" alt=\"\" class=\"wp-image-131\" srcset=\"https:\/\/naturavox.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-29-a-13.47.20-752x1024.png 752w, https:\/\/naturavox.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-29-a-13.47.20-220x300.png 220w, https:\/\/naturavox.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-29-a-13.47.20-768x1046.png 768w, https:\/\/naturavox.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-29-a-13.47.20-1128x1536.png 1128w, https:\/\/naturavox.org\/wp-content\/uploads\/2026\/09\/Capture-decran-2026-09-29-a-13.47.20.png 1298w\" sizes=\"auto, (max-width: 752px) 100vw, 752px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019int\u00e9r\u00eat de cet atlas d\u00e9passe cependant le rappel de quelques grands chiffres. Par la qualit\u00e9 de ses cartes, de ses infographies et de ses explications, l\u2019IGN rend accessible l&rsquo;histoire des transformations agricoles, des dynamiques naturelles et des choix d&rsquo;exploitation foresti\u00e8re.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Deux si\u00e8cles de reconqu\u00eate<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">Au XIXe si\u00e8cle, l\u2019industrialisation et l\u2019exode rural entra\u00eenent l\u2019abandon de certaines terres agricoles. Les progr\u00e8s de l\u2019agriculture permettent parall\u00e8lement de produire davantage sur des surfaces plus r\u00e9duites. Les arbres retrouvent alors une place sur des espaces auparavant cultiv\u00e9s ou p\u00e2tur\u00e9s.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans un entretien publi\u00e9 dans l\u2019atlas, le chercheur Jean-Luc Dupouey, de l\u2019INRAE, rappelle que cette reconqu\u00eate s\u2019est d\u2019abord produite spontan\u00e9ment. Elle a ensuite \u00e9t\u00e9 accompagn\u00e9e par des plantations, notamment de r\u00e9sineux, financ\u00e9es par l\u2019\u00c9tat.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les for\u00eats que nous parcourons aujourd\u2019hui sont ainsi, pour une partie d\u2019entre elles, relativement r\u00e9centes. Dans les sous-bois se rencontre souvent les traces  anciennes des p\u00e2turages exploit\u00e9s il y a plusieurs g\u00e9n\u00e9rations.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Des cartes qui racontent les paysages<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">La confrontation des cartes d\u2019\u00e9tat-major du XIXe si\u00e8cle avec les donn\u00e9es foresti\u00e8res contemporaines permet de suivre concr\u00e8tement le d\u00e9placement et l\u2019extension des boisements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La progression appara\u00eet particuli\u00e8rement marqu\u00e9e sur les terres o\u00f9 l\u2019agriculture \u00e9tait la moins rentable, notamment dans les secteurs de basse montagne du sud du Massif central, dans les Alpes du Sud ou en Corse. Les feuillus y ont largement gagn\u00e9 du terrain. Dans les Landes, le Limousin, la Sologne ou le Morvan, les plantations de r\u00e9sineux ont \u00e9galement contribu\u00e9 \u00e0 remodeler les paysages.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Les grandes plaines fertiles du Bassin parisien ont, \u00e0 l\u2019inverse, conserv\u00e9 leur vocation agricole. L\u2019expansion nationale n\u2019efface donc pas les diff\u00e9rences locales, ni les pertes de boisements qui ont pu survenir dans certains territoires.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Une richesse qui d\u00e9passe la seule surface<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019ouvrage explore aussi les multiples fonctions de ces espaces bois\u00e9s. Les for\u00eats de l\u2019Hexagone accueillent quelque 190 essences d\u2019arbres, 73 esp\u00e8ces de mammif\u00e8res, 120 esp\u00e8ces d\u2019oiseaux et 30 000 esp\u00e8ces d\u2019insectes, selon les chiffres rassembl\u00e9s dans l\u2019atlas.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Elles participent \u00e0 la r\u00e9gulation des temp\u00e9ratures : les temp\u00e9ratures maximales y sont en moyenne inf\u00e9rieures de 4 \u00b0C \u00e0 celles des milieux ouverts environnants, gr\u00e2ce \u00e0 l\u2019ombrage et \u00e0 la transpiration du feuillage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Production de bois, stockage du carbone, biodiversit\u00e9, loisirs : l\u2019IGN restitue cette diversit\u00e9 de fonctions sans r\u00e9duire la for\u00eat \u00e0 un simple indicateur de superficie. C\u2019est aussi ce qui fait la qualit\u00e9 de ce travail de synth\u00e8se.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Une progression qui n\u2019exclut pas les difficult\u00e9s<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019atlas aborde \u00e9galement les fragilit\u00e9s des peuplements. S\u00e9cheresses, maladies et insectes ravageurs contribuent \u00e0 une augmentation de la mortalit\u00e9 des arbres.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ces difficult\u00e9s ne conduisent toutefois pas les sp\u00e9cialistes interrog\u00e9s \u00e0 parler d\u2019un d\u00e9clin g\u00e9n\u00e9ralis\u00e9 des for\u00eats fran\u00e7aises. Le renouvellement se poursuit, sous l\u2019effet des dynamiques naturelles et des interventions des gestionnaires.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le bilan m\u00e9rite donc d\u2019\u00eatre lu dans toutes ses dimensions. La for\u00eat fran\u00e7aise s\u2019\u00e9tend, tout en se transformant et en affrontant de nouvelles contraintes. En documentant ces \u00e9volutions avec rigueur et en les rendant lisibles gr\u00e2ce \u00e0 une cartographie soign\u00e9e, l\u2019IGN accomplit un pr\u00e9cieux travail de connaissance et de transmission. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em><a href=\"https:\/\/www.ign.fr\/atlas-cartographier-anthropocene-2026-foret\" data-type=\"link\" data-id=\"https:\/\/www.ign.fr\/atlas-cartographier-anthropocene-2026-foret\">Source : IGN, Atlas 2026 \u2014 Cartographier l\u2019anthropoc\u00e8ne : La for\u00eat. Les chiffres cit\u00e9s proviennent de diff\u00e9rentes p\u00e9riodes d\u2019observation et ne portent pas sur la seule ann\u00e9e 2026.<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>La progression des surfaces foresti\u00e8res fran\u00e7aises est un ph\u00e9nom\u00e8ne bien document\u00e9. L\u2019atlas 2026 de l\u2019IGN vient le confirmer et lui donner toute sa dimension : avec 17,6 millions d\u2019hectares dans l\u2019Hexagone et en Corse, la for\u00eat occupe presque deux fois plus d\u2019espace qu\u2019au XIXe si\u00e8cle. Un remarquable travail de cartographie \u00e9claire cette transformation de nos [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":132,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-130","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-societe"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"La progression des surfaces foresti\u00e8res fran\u00e7aises est un ph\u00e9nom\u00e8ne bien document\u00e9. 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