{"id":529749,"date":"2017-10-07T22:20:41","date_gmt":"2017-10-07T21:20:41","guid":{"rendered":"https:\/\/www.pressenza.com\/?p=529749\/"},"modified":"2017-10-07T22:23:44","modified_gmt":"2017-10-07T21:23:44","slug":"lutte-contre-desertification-passe-preservation-cycle-de-leau","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/fr\/2017\/10\/lutte-contre-desertification-passe-preservation-cycle-de-leau\/","title":{"rendered":"La lutte contre la d\u00e9sertification passe par la pr\u00e9servation du cycle de l\u2019eau"},"content":{"rendered":"<p><strong>A Ordos, en Chine, s\u2019est tenue du 6 au 16 ao\u00fbt la COP 13, 13e r\u00e9union des parties de la Convention des Nations Unies sur la lutte contre la d\u00e9sertification. Ce ph\u00e9nom\u00e8ne, moins m\u00e9diatis\u00e9 que le climat, touche pourtant plus de 1,5 milliard de personnes dans le monde.<\/strong><\/p>\n<p>En 1992, suite au Sommet de l\u2019environnement \u00e0 Rio au Br\u00e9sil, trois conventions historiques sont \u00e9tablies par les Nations Unies. Ces conventions portent sur des th\u00e9matiques clefs pour l\u2019environnement\u00a0:<\/p>\n<ul>\n<li>la <a href=\"https:\/\/www.cbd.int\/doc\/legal\/cbd-fr.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">diversit\u00e9 biologique<\/a>,<\/li>\n<li>les <a href=\"http:\/\/unfccc.int\/resource\/docs\/convkp\/convfr.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">changements climatiques<\/a> (texte qui donna notamment lieu \u00e0 la COP21 \u00e0 Paris),<\/li>\n<li>et la <a href=\"http:\/\/www.unccd.int\/Lists\/SiteDocumentLibrary\/conventionText\/conv-fre.pdf\" target=\"_blank\" rel=\"noopener noreferrer\">lutte contre la d\u00e9sertification<\/a>.<\/li>\n<\/ul>\n<p>Chaque ann\u00e9e, on estime que 12 millions d\u2019hectares de terres arables disparaissent, principalement sur les continents africain et asiatique. Contrairement aux id\u00e9es re\u00e7ues, la d\u00e9sertification ne correspond pas \u00e0 l\u2019avanc\u00e9e du d\u00e9sert mais \u00e0 une v\u00e9ritable d\u00e9gradation des terres. Tout commence par l\u2019alt\u00e9ration de la v\u00e9g\u00e9tation. Les racines disparaissent, les sols sont de moins moins a\u00e9r\u00e9s, deviennent moins poreux. L\u2019eau de pluie, plut\u00f4t que de s\u2019infiltrer, ruisselle sur un sol compact. Une modification du r\u00e9gime hydrique et des \u00e9changes avec l\u2019atmosph\u00e8re s\u2019op\u00e8re peu \u00e0 peu.\u00a0 Le sol ne b\u00e9n\u00e9ficie plus de la protection de la couverture v\u00e9g\u00e9tale et subi l\u2019action m\u00e9canique des pr\u00e9cipitations et du vent, venant accentuer l\u2019\u00e9rosion.<\/p>\n<p>Ce processus de d\u00e9gradation des terres est provoqu\u00e9 par les variations climatiques mais principalement par les activit\u00e9s humaines. Des pratiques inadapt\u00e9es et n\u00e9fastes comme le surp\u00e2turage, le d\u00e9boisement, les technique agricoles d\u00e9raisonn\u00e9es (monoculture), les cultures inadapt\u00e9es au milieu, l\u2019extension urbaine, sont autant de sources de pression exerc\u00e9es sur les ressources naturelles renouvelables. Celles-ci, surexploit\u00e9es, sont alors en incapacit\u00e9 de se r\u00e9g\u00e9n\u00e9rer.<\/p>\n<p>V\u00e9ritable cercle vicieux, cette destruction progressive du sol s\u2019accompagne d\u2019une baisse de sa fertilit\u00e9. La d\u00e9sertification engendre r\u00e9guli\u00e8rement des cons\u00e9quences dramatiques pour les populations. L\u2019appauvrissement des terres et le manque d\u2019eau entraine une diminution de la production agricole. Or, la majorit\u00e9 des populations vivant sous le seuil de pauvret\u00e9 dans le monde survit gr\u00e2ce \u00e0 l\u2019agriculture, qu\u2019il s\u2019agisse de cultures vivri\u00e8res ou destin\u00e9es au commerce. Populations vuln\u00e9rables \u00e0 la variabilit\u00e9 climatique et \u00e0 celle des prix agricoles, leur marge d\u2019adaptation est plus qu\u2019\u00e9troite. Face \u00e0 la pauvret\u00e9, \u00e0 l\u2019ins\u00e9curit\u00e9 alimentaire et au manque de ressources en eau, les tensions sociales s\u2019exacerbent. La migration devient parfois la derni\u00e8re solution envisageable.<\/p>\n<p>Le sujet de la d\u00e9sertification est souvent \u00e9tudi\u00e9 via l\u2019angle \u00ab\u00a0sol\u00a0\u00bb. Pourtant, le cycle de l\u2019eau tient un r\u00f4le pr\u00e9pond\u00e9rant dans le processus de d\u00e9sertification. Sa prise en compte est essentielle pour aboutir \u00e0 des solutions durables. La v\u00e9g\u00e9tation d\u2019un territoire entretient les \u00e9changes hydriques entre ciel et terre \u00e0 travers l\u2019\u00e9vapotranspiration des v\u00e9g\u00e9taux, processus essentiel pour que la pluie tombe localement. Les racines de ces arbres vont de leur c\u00f4t\u00e9 maintenir le sol et permettre \u00e0 l\u2019eau de pluie de s\u2019infiltrer pour \u00eatre stock\u00e9e.<\/p>\n<p>Les derniers rapports du GIEC pr\u00e9voient une recrudescence des s\u00e9cheresses et une progression de la d\u00e9sertification. Or, les s\u00e9cheresses, une insuffisance de pluie, participent \u00e0 la d\u00e9sertification et l\u2019acc\u00e9l\u00e8rent. Am\u00e9liorer la gestion de l\u2019eau de pluie fait partie des facteurs limitant la d\u00e9sertification. Il est plus \u00e9conomique d\u2019investir dans la pr\u00e9vention de la d\u00e9sertification plut\u00f4t que de tenter de remettre en \u00e9tat des sols d\u00e9j\u00e0 fortement d\u00e9grad\u00e9s et dont la constitution a pris auparavant des milliers d\u2019ann\u00e9es.<\/p>\n<p>Les enjeux locaux se r\u00e9percutent \u00e0 l\u2019\u00e9chelle internationale, c\u2019est pourquoi l\u2019ONU a choisi en 1992 de faire de la lutte contre la d\u00e9sertification l\u2019un de ces axes d\u2019action. Les Nations Unies ont depuis d\u00e9velopp\u00e9 les <a href=\"http:\/\/www.undp.org\/content\/undp\/fr\/home\/sustainable-development-goals.html\" target=\"_blank\" rel=\"noopener noreferrer\">Objectifs du D\u00e9veloppement Durable<\/a> parmi lesquels <a href=\"http:\/\/www.undp.org\/content\/undp\/fr\/home\/sustainable-development-goals\/goal-15-life-on-land\/targets.html\" target=\"_blank\" rel=\"noopener noreferrer\">l\u2019Objectif 15<\/a> vise \u00e0 \u00ab\u00a0<em>Pr\u00e9server et restaurer les \u00e9cosyst\u00e8mes terrestres, en veillant \u00e0 les exploiter de fa\u00e7on durable, g\u00e9rer durablement les for\u00eats, lutter contre la d\u00e9sertification, enrayer et inverser le processus de d\u00e9gradation des sols et mettre fin \u00e0 l\u2019appauvrissement de la biodiversit\u00e9\u00a0<\/em>\u00bb. Cet objectif de lutte contre la d\u00e9sertification n\u00e9cessite d\u2019\u00eatre d\u00e9clin\u00e9 \u00e0 toute les \u00e9chelles territoriales, de la parcelle \u00e0 la r\u00e9gion agricole, comme les \u00e9chelles d\u00e9cisionnelles, de la famille aux sph\u00e8res onusiennes.<strong> Les v\u00e9ritables solutions ne pourront \u00eatre que transversales, multidisciplinaires et adapt\u00e9es au local, incluant aussi bien les savoirs traditionnels que les apprentissages scientifiques r\u00e9cents.<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-24178\" title=\"ceinture verte Kenya\" src=\"https:\/\/www.france-libertes.org\/wp-content\/uploads\/2017\/07\/ceinture-verte-300x223.png\" alt=\"ceinture verte Kenya\" width=\"225\" height=\"167\" \/>France Libert\u00e9s soutient les projets luttant contre la d\u00e9gradation des terres gr\u00e2ce \u00e0 la restauration du cycle de l\u2019eau. De nombreuses initiatives locales dans le monde m\u00e9riteraient d\u2019\u00eatre connues et dupliqu\u00e9es ailleurs. France Libert\u00e9s pr\u00e9sente dans son <a href=\"https:\/\/www.france-libertes.org\/wp-content\/uploads\/save\/pdf\/eau_et_climat.pdf\">Plaidoyer Eau et Climat<\/a> (qui fait depuis peu l\u2019objet d\u2019un <a href=\"http:\/\/www.uneseuleplanete.org\/Leauetlechangementclimatique\" target=\"_blank\" rel=\"noopener noreferrer\">web documentaire<\/a>, outil participatif et instructif) le mouvement de la ceinture verte. Il s\u2019agit d\u2019un projet majeur et symbolique de lutte contre la d\u00e9sertification. Cette barri\u00e8re de v\u00e9g\u00e9tation, initi\u00e9e par la biologiste et Prix Nobel de la Paix (2004) Wangari Maatha\u00ef,\u00a0 traverse l\u2019Afrique d\u2019est en ouest pour att\u00e9nuer la d\u00e9sertification.<\/p>\n<p>La diffusion de ces alternatives locales d\u00e9pend grandement de l\u2019environnement dans lequel elles \u00e9voluent. Le droit d\u2019acc\u00e8s \u00e0 l\u2019eau, \u00e0 la terre, la paix et la s\u00e9curit\u00e9 sont essentiels pour\u00a0 soutenir, valoriser et d\u00e9ployer de telles solutions contre la d\u00e9sertification. Ban Ki Moon, ancien secr\u00e9taire g\u00e9n\u00e9ral de l\u2019ONU, souligne d\u2019ailleurs l\u2019importance de garantir les droits des populations et prot\u00e9ger chaque hectare pouvant receler de l\u2019eau douce.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A Ordos, en Chine, s\u2019est tenue du 6 au 16 ao\u00fbt la COP 13, 13e r\u00e9union des parties de la Convention des Nations Unies sur la lutte contre la d\u00e9sertification. Ce ph\u00e9nom\u00e8ne, moins m\u00e9diatis\u00e9 que le climat, touche pourtant plus&hellip;<\/p>\n","protected":false},"author":914,"featured_media":529754,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83,97,40],"tags":[301,40658],"class_list":["post-529749","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-africa-fr","category-environnement-et-ecologie","category-international-fr","tag-eau","tag-lutte-contre-la-desertification"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>La lutte contre la d\u00e9sertification passe par la pr\u00e9servation du cycle de l\u2019eau<\/title>\n<meta name=\"description\" content=\"A Ordos, en Chine, s\u2019est tenue du 6 au 16 ao\u00fbt la COP 13, 13e r\u00e9union des parties de la Convention des Nations Unies sur la lutte 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