{"id":4798,"date":"2009-03-12T19:34:35","date_gmt":"2009-03-12T17:34:35","guid":{"rendered":"http:\/\/www.laterredufutur.com\/accueil1\/?p=4798"},"modified":"2015-04-13T19:36:12","modified_gmt":"2015-04-13T17:36:12","slug":"la-foret-africaine-repousse","status":"publish","type":"post","link":"https:\/\/www.laterredufutur.com\/accueil\/la-foret-africaine-repousse\/","title":{"rendered":"La For\u00eat Africaine Repousse"},"content":{"rendered":"<div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"1\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n<p align=\"justify\"><span style=\"font-size: small;\">Dans le th\u00e8me du <\/span><span style=\"font-size: small;\">sahara qui reverdit<\/span><span style=\"font-size: small;\">, Les for\u00eats d&rsquo;Afrique stockent de plus en plus de CO2, \u00e0 l&rsquo;instar de celles d&rsquo;Amazonie, r\u00e9v\u00e8le une \u00e9tude internationale (Etats-Unis, Europe, Afrique, Asie) jeudi 19 f\u00e9vrier 2009 dans la revue britannique Nature.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Un r\u00e9seau de 79 laboratoires install\u00e9s dans dix pays d&rsquo;Afrique a permis de montrer, sur la p\u00e9riode 1968-2007, que l&rsquo;absorption de carbone par les arbres de ces r\u00e9gions s&rsquo;est accrue dans des proportions comparables \u00e0 celle enregistr\u00e9e pour la for\u00eat amazonienne, soit 0,63 tonne par hectare et par an, soulignent les chercheurs.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Les arbres captent du carbone par la photosynth\u00e8se, l&rsquo;incorporent dans les mati\u00e8res organiques et rejettent du carbone, directement en respirant et indirectement par la d\u00e9composition des feuilles, racines, d\u00e9bris qu&rsquo;ils apportent au sol. Au passage, ils en fixent une partie, et c&rsquo;est ainsi que les for\u00eats comptent au nombre des \u00ab\u00a0puits\u00a0\u00bb de carbone qui, comme les oc\u00e9ans, avalent une partie de l&rsquo;exc\u00e9dent.<\/span><\/p><div class=\"1665f18d14f35dd9e7566e1a8ac9a3e9\" data-index=\"2\" style=\"float: none; margin:10px 0 10px 0; text-align:center;\">\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block; text-align:center;\"\r\n     data-ad-layout=\"in-article\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-client=\"ca-pub-2860849627502538\"\r\n     data-ad-slot=\"3019501113\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script>\n<\/div>\n\n<p align=\"justify\"><span style=\"font-size: small;\">\u00ab\u00a0Les for\u00eats tropicales africaines fournissent un \u00e9cosyst\u00e8me important en captant le carbone et en \u00e9tant un puits de carbone, r\u00e9duisant ainsi le taux d&rsquo;accroissement du CO2 dans l&rsquo;atmosph\u00e8re\u00a0\u00bb, notent les chercheurs en soulignant la n\u00e9cessit\u00e9 de les prot\u00e9ger. Le CO2 est le principal gaz responsable du changement climatique.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Le stockage de carbone par la for\u00eat irait de quelques centaines de kilos \u00e0 quelques tonnes par hectare et par an. Les for\u00eats tropicales, qui couvrent de 7 \u00e0 10% des terres de la plan\u00e8te, pourraient stocker, selon les estimations, de 40 \u00e0 50% du CO2 pr\u00e9sent dans la v\u00e9g\u00e9tation. Elles sont donc \u00ab\u00a0un \u00e9l\u00e9ment critique, mais tr\u00e8s mal quantifi\u00e9, du cycle du carbone\u00a0\u00bb, constatent les auteurs de l&rsquo;\u00e9tude.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">Dans un commentaire, une sp\u00e9cialiste de l&rsquo;Institut de Recherche tropicale Smithonian au Panama, H\u00e9l\u00e8ne Muller-Landau, consid\u00e8re que l&rsquo;augmentation d&rsquo;absorption du CO2 par les for\u00eats africaines peut avoir deux explications : soit elles ont subi de graves dommages (incendies&#8230;) dans le pass\u00e9 et sont actuellement dans une phase de repousse, soit elles ont \u00e9t\u00e9 perturb\u00e9es par les changements climatiques et atmosph\u00e9riques r\u00e9cents et sont en transition.<\/span><\/p>\n<p align=\"justify\"><span style=\"font-size: small;\">source : <a href=\"http:\/\/fr.news.yahoo.com\/\">http:\/\/fr.news.yahoo.com\/<\/a><\/span><\/p>\n<p class=\"bawpvc-ajax-counter\" data-id=\"4798\">(349)<\/p>\n<!--CusAds0-->\n<div style=\"font-size: 0px; height: 0px; line-height: 0px; margin: 0; padding: 0; clear: both;\"><\/div>","protected":false},"excerpt":{"rendered":"<p>Dans le th\u00e8me du sahara qui reverdit, Les for\u00eats d&rsquo;Afrique stockent de plus en plus de CO2, \u00e0 l&rsquo;instar de&#8230;<\/p>\n","protected":false},"author":1,"featured_media":4799,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"ngg_post_thumbnail":0,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[27],"tags":[196,289,314,3593,3592,636,1795],"class_list":["post-4798","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ecologie","tag-afrique","tag-arbres","tag-foret","tag-pousse","tag-repousse","tag-sahara","tag-verdure","wpcat-27-id"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/04\/foret-cote-d-ivoire.jpg?fit=380%2C269&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p631RN-1fo","jetpack-related-posts":[{"id":15540,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-terre-abrite-beaucoup-plus-de-forets-que-ce-quon-pensait\/","url_meta":{"origin":4798,"position":0},"title":"La Terre abrite beaucoup plus de for\u00eats que ce qu&rsquo;on pensait","author":"Admin","date":"3 ao\u00fbt 2017","format":false,"excerpt":"Une nouvelle analyse globale de la r\u00e9partition des for\u00eats sur le globe a permis de d\u00e9couvrir 467 millions d'hectares de for\u00eats pr\u00e9c\u00e9demment non d\u00e9clar\u00e9es. Il s'agit d'une superficie \u00e9quivalant \u00e0 60% de la taille de l'Australie. Cette d\u00e9couverte augmente d'environ 9% la quantit\u00e9 connue de couverture foresti\u00e8re mondiale et augmentera\u2026","rel":"","context":"Dans &quot;Divers&quot;","block_context":{"text":"Divers","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/divers\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/arbres-4.jpg?fit=900%2C506&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/arbres-4.jpg?fit=900%2C506&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/arbres-4.jpg?fit=900%2C506&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/05\/arbres-4.jpg?fit=900%2C506&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":16045,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-grande-muraille-verte-repousse-le-desert-du-sahara\/","url_meta":{"origin":4798,"position":1},"title":"La grande muraille verte repousse le d\u00e9sert du Sahara","author":"Admin","date":"19 novembre 2017","format":false,"excerpt":"La grande muraille verte veut reboiser les terres arides et repousser le d\u00e9sert, sur 7 800 km. C\u2019est un projet colossal qui a \u00e9t\u00e9 initi\u00e9 par l\u2019Union Africaine en 2008. Cr\u00e9er une immense barri\u00e8re v\u00e9g\u00e9tale, d\u2019un bout \u00e0 l\u2019autre du continent, afin de freiner l\u2019avanc\u00e9e du d\u00e9sert. Un projet ambitieux,\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2015\/07\/trace-grande-muraille-verte-sahara.jpg?fit=416%2C257&ssl=1&resize=350%2C200","width":350,"height":200},"classes":[]},{"id":13262,"url":"https:\/\/www.laterredufutur.com\/accueil\/en-egypte-une-foret-a-pousse-au-coeur-du-sahara\/","url_meta":{"origin":4798,"position":2},"title":"En \u00c9gypte, une for\u00eat a pouss\u00e9 au c\u0153ur du Sahara","author":"Admin","date":"18 septembre 2016","format":false,"excerpt":"Faire pousser une for\u00eat au coeur du Sahara, c\u2019est possible. En Egypte, pays particuli\u00e8rement aride, des scientifiques ont fait le pari de transformer une partie du d\u00e9sert en terre fertile. Mission accomplie \u00e0 deux heures du Caire o\u00f9 une for\u00eat a vu le jour gr\u00e2ce aux eaux us\u00e9es. En r\u00e9gion\u2026","rel":"","context":"Dans &quot;Solutions&quot;","block_context":{"text":"Solutions","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/solutions\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/09\/foret-egypte-desert.jpg?fit=768%2C512&ssl=1&resize=700%2C400 2x"},"classes":[]},{"id":15169,"url":"https:\/\/www.laterredufutur.com\/accueil\/lequipe-dun-chercheur-belge-decouvre-467-millions-dhectares-de-foret-passes-sous-les-radars\/","url_meta":{"origin":4798,"position":3},"title":"L&rsquo;\u00e9quipe d&rsquo;un chercheur belge d\u00e9couvre 467 millions d&rsquo;hectares de for\u00eat pass\u00e9s sous les radars","author":"Admin","date":"16 mai 2017","format":false,"excerpt":"Une importante d\u00e9couverte sur l'estimation de la surface foresti\u00e8re mondiale, qui prend toute son importance dans le contexte du r\u00e9chauffement climatique, vient d'\u00eatre r\u00e9alis\u00e9e par une \u00e9quipe de scientifiques dirig\u00e9e par un chercheur de l'ULB et de la FAO, le Belge Jean-Fran\u00e7ois Bastin. Des arbres qui n'\u00e9taient pas vus du\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=700%2C400 2x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/05\/arbre-oasis.jpg?fit=1200%2C750&ssl=1&resize=1050%2C600 3x"},"classes":[]},{"id":15584,"url":"https:\/\/www.laterredufutur.com\/accueil\/afrique-pendant-30-ans-un-homme-a-plante-des-arbres-pour-arreter-le-desert\/","url_meta":{"origin":4798,"position":4},"title":"Afrique, pendant 30 ans, un homme a plant\u00e9 des arbres pour arr\u00eater le d\u00e9sert","author":"Admin","date":"19 ao\u00fbt 2017","format":false,"excerpt":"Yacouba Sawadogo est un agriculteur traditionnel et novateur du Burkina Faso qui a travaill\u00e9 sans rel\u00e2che dans une r\u00e9gion d\u00e9sertique au cours des 30 derni\u00e8res ann\u00e9es. Il a permis la restauration de for\u00eats locales par des anciennes techniques de protection des sols. Pour ce faire il n\u2019avait que deux outils,\u2026","rel":"","context":"Dans &quot;Solutions&quot;","block_context":{"text":"Solutions","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/solutions\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/07\/homme-afrique-plante-arbre.jpg?fit=675%2C353&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/07\/homme-afrique-plante-arbre.jpg?fit=675%2C353&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2017\/07\/homme-afrique-plante-arbre.jpg?fit=675%2C353&ssl=1&resize=525%2C300 1.5x"},"classes":[]},{"id":27544,"url":"https:\/\/www.laterredufutur.com\/accueil\/la-foret-amazonienne-est-en-train-de-basculer-vers-un-climat-hypertropical-et-les-arbres-ne-pourront-pas-y-survivre-longtemps\/","url_meta":{"origin":4798,"position":5},"title":"La for\u00eat amazonienne est en train de basculer vers un climat \u00ab hypertropical \u00bb, et les arbres ne pourront pas y survivre longtemps","author":"Admin","date":"15 d\u00e9cembre 2025","format":false,"excerpt":"La for\u00eat amazonienne conna\u00eet actuellement quelques jours ou semaines de s\u00e9cheresse intense par an, mais les chercheurs estiment que ce nombre pourrait passer \u00e0 150 jours par an d'ici 2100. La for\u00eat amazonienne se dirige lentement vers un r\u00e9gime climatique \u00ab hypertropical \u00bb qui n'a pas exist\u00e9 sur Terre depuis\u2026","rel":"","context":"Dans &quot;Climat&quot;","block_context":{"text":"Climat","link":"https:\/\/www.laterredufutur.com\/accueil\/sujets\/climat\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/07\/incendie-amazonie.jpg?fit=664%2C442&ssl=1&resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/07\/incendie-amazonie.jpg?fit=664%2C442&ssl=1&resize=350%2C200 1x, https:\/\/i0.wp.com\/www.laterredufutur.com\/accueil\/wp-content\/uploads\/2016\/07\/incendie-amazonie.jpg?fit=664%2C442&ssl=1&resize=525%2C300 1.5x"},"classes":[]}],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4798","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/comments?post=4798"}],"version-history":[{"count":1,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4798\/revisions"}],"predecessor-version":[{"id":4800,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/posts\/4798\/revisions\/4800"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media\/4799"}],"wp:attachment":[{"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/media?parent=4798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/categories?post=4798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laterredufutur.com\/accueil\/wp-json\/wp\/v2\/tags?post=4798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}