{"id":22028,"date":"2014-04-11T06:00:24","date_gmt":"2014-04-10T23:00:24","guid":{"rendered":"http:\/\/www.forestsnews.org\/?p=22028"},"modified":"2015-07-07T11:35:40","modified_gmt":"2015-07-07T04:35:40","slug":"interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant","status":"publish","type":"post","link":"https:\/\/www.forestsnews.org\/fr\/22028\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant","title":{"rendered":"Interview: une \u00e9tude montre que les arbres accumulent davantage de carbone en vieillissant"},"content":{"rendered":"<figure id=\"attachment_21183\" aria-describedby=\"caption-attachment-21183\" style=\"width: 500px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.forestsnews.org\/wp-content\/uploads\/2014\/02\/8701470236_d16da35b0c_z.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-large wp-image-21183 \" alt=\"Studi baru ini membantu pemahaman dinamika tegakan tua-pertumbuhan pohon dan pohon-pohon besar di tegakan hutan, ujar Louis Verchot, direktur hutan dan penelitian lingkungan CIFOR. Foto: CIFOR \/ Aulia Erlangga\" src=\"\/\/www.forestsnews.org\/wp-content\/uploads\/2014\/02\/8701470236_d16da35b0c_z-500x325.jpg\" width=\"500\" height=\"325\" \/><\/a><figcaption id=\"caption-attachment-21183\" class=\"wp-caption-text\">Une nouvelle \u00e9tude aide \u00e0 comprendre la dynamique des vieux peuplements d\u2019arbres et des grands arbres au sein de peuplements forestiers, selon Louis Verchot, directeur de la recherche sur les for\u00eats et l\u2019environnement du Centre de Recherche Foresti\u00e8re Internationale. Photo: CIFOR\/Aulia Erlangga<\/figcaption><\/figure>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">BOGOR, Indon\u00e9sie &#8211; Plut\u00f4t que de ralentir avec l&rsquo;\u00e2ge, les arbres poussent plus vite en grandissant, <\/span><\/span><a href=\"http:\/\/www.nature.com\/nature\/journal\/vaop\/ncurrent\/full\/nature12914.html\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">selon une nouvelle recherche<\/span><\/span><\/a><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\"> &#8211; ce qui signifie qu&rsquo;ils absorbent \u00e9galement plus de carbone de l&rsquo;atmosph\u00e8re. Une d\u00e9couverte qui pourrait avoir des implications pour la gestion des for\u00eats compos\u00e9es de vieux peuplements.<\/span><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">Un document, publi\u00e9 d\u00e9but f\u00e9vrier 2014 dans la revue Nature et intitul\u00e9 <\/span><\/span><a href=\"http:\/\/www.nature.com\/nature\/journal\/vaop\/ncurrent\/full\/nature12914.html\" target=\"_blank\"><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">Le taux d\u2019accumulation de carbone dans l&rsquo;arbre augmente de fa\u00e7on continue avec sa taille<\/span><\/span><\/a><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">, a r\u00e9v\u00e9l\u00e9 qu\u2019un seul arbre, plus \u00e2g\u00e9 et grand, peut absorber autant de carbone durant une ann\u00e9e qu\u2019en contient un arbre entier de taille moyenne. Bien que les conclusions de ce rapport puissent sembler contre-intuitives, elles ne sont pas tout \u00e0 fait surprenantes, dit Louis Verchot, directeur de la recherche sur les for\u00eats et l\u2019environnement du Centre de Recherche Foresti\u00e8re Internationale (CIFOR).<\/span><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">Dans cette interview, M. Verchot \u2013 qui n&rsquo;a pas particip\u00e9 \u00e0 l&rsquo;\u00e9tude \u2013 revient sur les implications du rapport et des questions qu&rsquo;il soul\u00e8ve.<\/span><\/span><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">Q: Que signifient les r\u00e9sultats de l&rsquo;\u00e9tude ?<\/span><\/span><\/strong><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">R:<\/span><\/span><\/strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\"> L&rsquo;\u00e9tude nous aide \u00e0 comprendre la dynamique des vieux peuplements d\u2019arbres et des grands arbres au sein de peuplements forestiers. Nous savions depuis un certain temps que les for\u00eats tropicales et les for\u00eats temp\u00e9r\u00e9es en r\u00e9g\u00e9n\u00e9ration absorbent des quantit\u00e9s consid\u00e9rables de carbone. Nous savions \u00e9galement que beaucoup de vieilles for\u00eats tropicales continuent d\u2019absorber du carbone de l&rsquo;atmosph\u00e8re. Cela a \u00e9t\u00e9 clairement d\u00e9montr\u00e9 dans l\u2019Exp\u00e9rience Biosph\u00e8re-Atmosph\u00e8re \u00e0 Grande Echelle en Amazonie au d\u00e9but des ann\u00e9es 2000. Cette \u00e9tude permet de clarifier certaines des questions autour des m\u00e9canismes par lesquels ces \u00e9cosyst\u00e8mes continuent \u00e0 accumuler du carbone.<\/span><\/span><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">Q: Pourquoi la vitesse d&rsquo;absorption de carbone par les arbres \u00e2g\u00e9s a-t-elle \u00e9t\u00e9 sous-estim\u00e9e dans le pass\u00e9 ?<\/span><\/span><\/strong><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">R:<\/span><\/span><\/strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\"> Des \u00e9tudes remontant aux ann\u00e9es 1990 ont montr\u00e9 que la circonf\u00e9rence des grands arbres dans des vieux peuplements continue \u00e0 augmenter. L&rsquo;\u00e9tude aborde la croissance relative au sein des peuplements et permet de quantifier cette croissance en biomasse, compar\u00e9e \u00e0 des arbres plus petits dans ces peuplements.<\/span><\/span><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">Q: Les r\u00e9sultats de l&rsquo;\u00e9tude sont-ils surprenants ?<\/span><\/span><\/strong><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">R: Je ne dirais pas que les r\u00e9sultats sont surprenants. Comme de nombreuses \u00e9tudes scientifiques de qualit\u00e9, celle-ci soul\u00e8ve autant de questions qu&rsquo;elle apporte de r\u00e9ponses. Par exemple, l&rsquo;\u00e9tude est bas\u00e9e sur l&rsquo;hypoth\u00e8se que la relation logarithmique entre la biomasse et le diam\u00e8tre est maintenue dans de tr\u00e8s grands arbres. Lorsque des \u00e9quations sur la biomasse sont \u00e9labor\u00e9es, ces arbres sont g\u00e9n\u00e9ralement sous-repr\u00e9sent\u00e9s, ce qui est le cas pour les \u00e9quations utilis\u00e9es ici. Ces \u00e9quations sont faites pour repr\u00e9senter les conditions \u00abmoyennes\u00bb \u00e0 l&rsquo;\u00e9chelle d&rsquo;un peuplement forestier. L\u2019application de telles \u00e9quations sur la biomasse \u00e0 des tr\u00e8s grands arbres et s\u00e9ries temporelles n\u2019aboutirait pas \u00e0 la d\u00e9tection d\u2019autres aspects, tels que, par exemple, la progression de la pourriture ou s\u00e9nescence et la perte de grandes branches. De ce fait, j&rsquo;esp\u00e8re que cette \u00e9tude stimulera davantage de recherches concernant la dynamique des peuplements et l&rsquo;importance des tr\u00e8s grands arbres au sein de ces for\u00eats.<\/span><\/span><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">Q: Qu&rsquo;est-ce que cela signifie pour les mod\u00e8les de changement climatique ?<\/span><\/span><\/strong><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">R:<\/span><\/span><\/strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\"> En fait, tr\u00e8s peu de chose. Ces mod\u00e8les fonctionnent \u00e0 une \u00e9chelle beaucoup plus grande que celle des arbres individuels et concernent plut\u00f4t l&rsquo;\u00e9change net de carbone de l&rsquo;\u00e9cosyst\u00e8me entre la biosph\u00e8re et l&rsquo;atmosph\u00e8re. Cette \u00e9tude nous expose comment cet \u00e9change fonctionne, mais elle ne modifie pas notre \u00e9valuation de l&rsquo;ampleur de l\u2019\u00e9change.<\/span><\/span><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">Q: Quelles sont les implications pour la gestion foresti\u00e8re ?<\/span><\/span><\/strong><\/p>\n<p><strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\">R:<\/span><\/span><\/strong><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\"> R\u00e9cemment, il y a eu plusieurs \u00e9tudes concernant la valeur des tr\u00e8s grands arbres dans les processus \u00e9cosyst\u00e9miques. Ce document ajoute des \u00e9l\u00e9ments de preuve et sugg\u00e8re que le stockage du carbone pourrait \u00eatre un service \u00e9cologique suppl\u00e9mentaire rendu par ces arbres. En cons\u00e9quence, cela devrait appuyer l\u2019int\u00e9gration de ces consid\u00e9rations dans les plans d&rsquo;am\u00e9nagement forestier.<\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>BOGOR, Indon\u00e9sie &#8211; Plut\u00f4t que de ralentir avec l&rsquo;\u00e2ge, les arbres poussent plus vite en grandissant, selon une nouvelle recherche &#8211; ce qui signifie qu&rsquo;ils absorbent \u00e9galement plus de carbone de l&rsquo;atmosph\u00e8re. Une d\u00e9couverte qui pourrait avoir des implications pour la gestion des for\u00eats compos\u00e9es de vieux peuplements. Un document, publi\u00e9 d\u00e9but f\u00e9vrier 2014 dans [&hellip;]<\/p>\n","protected":false},"author":212,"featured_media":21189,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[6090],"tags":[479],"language":[2170],"location":[],"tag-bahasa":[],"tag-espanol":[],"tag-francais":[],"type-espanol":[],"type-bahasa":[],"type-english":[],"type-francais":[],"coauthors":[1083,6162],"class_list":["post-22028","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-forests-news","tag-global","language-francais"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.4 (Yoast SEO v28.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Interview: une \u00e9tude montre que les arbres accumulent davantage de carbone en vieillissant - Landscape Alliance Forests News<\/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:\/\/www.forestsnews.org\/fr\/22028\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Interview: une \u00e9tude montre que les arbres accumulent davantage de carbone en vieillissant\" \/>\n<meta property=\"og:description\" content=\"BOGOR, Indon\u00e9sie &#8211; Plut\u00f4t que de ralentir avec l&rsquo;\u00e2ge, les arbres poussent plus vite en grandissant, selon une nouvelle recherche &#8211; ce qui signifie qu&rsquo;ils absorbent \u00e9galement plus de carbone de l&rsquo;atmosph\u00e8re. Une d\u00e9couverte qui pourrait avoir des implications pour la gestion des for\u00eats compos\u00e9es de vieux peuplements. Un document, publi\u00e9 d\u00e9but f\u00e9vrier 2014 dans [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.forestsnews.org\/fr\/22028\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant\" \/>\n<meta property=\"og:site_name\" content=\"Landscape Alliance Forests News\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/CIFORICRAF\" \/>\n<meta property=\"article:published_time\" content=\"2014-04-10T23:00:24+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2015-07-07T04:35:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.forestsnews.org\/wp-content\/uploads\/2014\/02\/8701470236_d16da35b0c_z1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"640\" \/>\n\t<meta property=\"og:image:height\" content=\"417\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Bruno Vander Velde, Bruno Vander Velde\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@BrunoVelde\" \/>\n<meta name=\"twitter:site\" content=\"@CIFOR_ICRAF\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.forestsnews.org\\\/fr\\\/22028\\\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.forestsnews.org\\\/fr\\\/22028\\\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant\"},\"author\":{\"name\":\"Bruno Vander Velde\",\"@id\":\"https:\\\/\\\/www.forestsnews.org\\\/fr#\\\/schema\\\/person\\\/50fd47d0a4f376c063a16b722f21fa8e\"},\"headline\":\"Interview: une \u00e9tude montre que les arbres accumulent davantage de carbone en vieillissant\",\"datePublished\":\"2014-04-10T23:00:24+00:00\",\"dateModified\":\"2015-07-07T04:35:40+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.forestsnews.org\\\/fr\\\/22028\\\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant\"},\"wordCount\":787,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.forestsnews.org\\\/fr#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.forestsnews.org\\\/fr\\\/22028\\\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.forestsnews.org\\\/wp-content\\\/uploads\\\/2014\\\/02\\\/8701470236_d16da35b0c_z1.jpg\",\"keywords\":[\"global\"],\"articleSection\":[\"Forests News\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.forestsnews.org\\\/fr\\\/22028\\\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant#respond\"]}],\"copyrightYear\":\"2014\",\"copyrightHolder\":{\"@id\":\"https:\\\/\\\/www.forestsnews.org\\\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.forestsnews.org\\\/fr\\\/22028\\\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant\",\"url\":\"https:\\\/\\\/www.forestsnews.org\\\/fr\\\/22028\\\/interview-une-etude-montre-que-les-arbres-accumulent-davantage-de-carbone-en-vieillissant\",\"name\":\"Interview: une \u00e9tude montre que les arbres accumulent davantage de carbone en vieillissant - 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