{"id":19270,"date":"2013-10-09T06:00:59","date_gmt":"2013-10-08T23:00:59","guid":{"rendered":"http:\/\/www.forestsnews.org\/?p=19270"},"modified":"2018-02-07T16:39:39","modified_gmt":"2018-02-07T09:39:39","slug":"les-parcelles-agroforestieres-des-petites-exploitations-peuvent-renforcer-la-conservation-des-arbres","status":"publish","type":"post","link":"https:\/\/www.forestsnews.org\/fr\/19270\/les-parcelles-agroforestieres-des-petites-exploitations-peuvent-renforcer-la-conservation-des-arbres","title":{"rendered":"Les parcelles agroforesti\u00e8res des petites exploitations peuvent renforcer la conservation des arbres"},"content":{"rendered":"<figure id=\"attachment_19108\" aria-describedby=\"caption-attachment-19108\" style=\"width: 500px\" class=\"wp-caption alignnone\"><a style=\"text-align: center; font-size: 13px;\" href=\"http:\/\/www.forestsnews.org\/wp-content\/uploads\/2013\/09\/agroforest-zambia.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\" wp-image-19108\" alt=\"Lebih banyak riset diperlukan untuk menentukan seberapa baik pertanian wanatani kecil berkontribusi pada konservasi. World Agroforestry Centre.\" src=\"\/\/www.forestsnews.org\/wp-content\/uploads\/2013\/09\/agroforest-zambia-500x375.jpg\" width=\"500\" height=\"375\" \/><\/a><figcaption id=\"caption-attachment-19108\" class=\"wp-caption-text\">Il faut davantage de recherches pour d\u00e9terminer comment les petites exploitations agroforesti\u00e8res contribuent \u00e0 la conservation. Photo: <a href=\"http:\/\/www.flickr.com\/photos\/icraf\/sets\/72157633219849616\/\" target=\"_blank\">World Agroforestry Centre<\/a>.<\/figcaption><\/figure>\n<p><span style=\"font-size: small; font-family: Tahoma, sans-serif; line-height: 19px;\">Bogor, Indon\u00e9sie (16 september 2013) _ Quand les for\u00eats naturelles sont menac\u00e9es par la d\u00e9forestation ou le changement climatique, la meilleure mani\u00e8re d&rsquo;assurer la survie de certaines esp\u00e8ces en danger serait de les ins\u00e9rer dans des parcelles agroforesti\u00e8res g\u00e9r\u00e9es par des petits exploitants, selon une nouvelle \u00e9tude.<\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Un article des chercheurs du Centre de recherche foresti\u00e8re internationale (CIFOR) et du Centre mondial d&rsquo;agroforesterie (ICRAF) <a href=\"\/\/www.cifor.org\/online-library\/browse\/view-publication\/publication\/4041.html\" target=\"_blank\">publi\u00e9 r\u00e9cemment dans le journal <\/a><\/span><\/span><span style=\"color: #0000ff;\"><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><span style=\"text-decoration: underline;\"><a href=\"\/\/www.cifor.org\/online-library\/browse\/view-publication\/publication\/4041.html\" target=\"_blank\">Biodiversity and Conservation<\/a>*<\/span><\/span><\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"> explique que les arbres peuvent \u00eatre conserv\u00e9s de trois fa\u00e7ons.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Ils peuvent \u00eatre laiss\u00e9s dans leur habitat naturel d&rsquo;origine, connu sous le nom de conservation <\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>in situ<\/i><\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"> ou \u00ab\u00e0 leur lieu d&rsquo;origine\u00bb.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Si les arbres ont de la valeur parce qu&rsquo;ils produisent du bois, des fruits ou d&rsquo;autres produits de base, les agriculteurs peuvent les transplanter dans les parcelles agroforesti\u00e8res situ\u00e9es \u00e0 proximit\u00e9. Cette technique est connue sous le nom de conservation <\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>circa situm<\/i><\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">, signifiant \u00ab\u00e0 proximit\u00e9 de leur lieu d&rsquo;origine\u00bb.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Ou encore, les arbres peuvent \u00eatre conserv\u00e9s en tant que semences ou dans des banques de g\u00e8nes, connu alors sous le nom de conservation <\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>ex situ<\/i><\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">, ou \u00aben dehors de leur habitat d&rsquo;origine\u00bb.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Ces trois types de conservation sont intimement li\u00e9s et les petits exploitants jouent un r\u00f4le dans chacun d&rsquo;eux. Cependant les scientifiques savent en fait tr\u00e8s peu de choses sur l&rsquo;\u00e9tendue et les limites de ces liens et sur leur efficacit\u00e9, d\u00e9clare Manuel Guariguata, un chercheur principal du CIFOR.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">\u00abNous savons que les agrofor\u00eats peuvent \u00eatre tr\u00e8s diversifi\u00e9es, mais nous ne connaissons pas vraiment la dynamique des liens existants entre les exploitations agricoles et les \u00e9cosyst\u00e8mes naturels\u00bb, dit-il. \u00abPar exemple, nous ne savons pas exactement ce qui se passe entre les esp\u00e8ces de bois d&rsquo;\u0153uvre et d&rsquo;autres esp\u00e8ces sauvages quand les petits exploitants les domestiquent en les plantant en dehors de leur habitat naturel.\u00bb<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Pour qu&rsquo;une esp\u00e8ce survive, sa population doit \u00eatre suffisamment importante pour maintenir une diversit\u00e9 g\u00e9n\u00e9tique. N\u00e9anmoins, davantage de recherches sont n\u00e9cessaires pour d\u00e9terminer dans quelle mesure les petites exploitations agroforesti\u00e8res contribuent \u00e0 la conservation, indique l&rsquo;article.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">\u00abUne des id\u00e9es re\u00e7ue est que si vous plantez des arbres dans des plantations ou des syst\u00e8mes agroforestiers, cela contribuera \u00e0 la conservation des peuplements naturels d&rsquo;arbres\u00bb, d\u00e9clare Ian Dawson du Centre mondial d&rsquo;agroforesterie, auteur principal de l&rsquo;article.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">On pr\u00e9sume que les gens r\u00e9coltent les arbres dans les plantations ou les parcelles agroforesti\u00e8res, laissant la for\u00eat naturelle intacte, mais il existe peu de recherches pour appuyer cette hypoth\u00e8se, dit-il. Et d&rsquo;ajouter: \u00abLes gens prennent peut-\u00eatre cela pour acquis sans penser qu&rsquo;il faudrait \u00e9tudier ce lien.\u00bb<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">\u00abNous avons besoin d&rsquo;une meilleure compr\u00e9hension de la relation entre les pratiques agroforesti\u00e8res effectu\u00e9es dans une zone et la conservation de zones foresti\u00e8res adjacentes\u00bb, d\u00e9clare M. Dawson.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Les agriculteurs qui combinent l&rsquo;agriculture et la sylviculture peuvent contribuer \u00e0 la conservation de plusieurs fa\u00e7ons. Cependant, il est important d&rsquo;examiner comment les diff\u00e9rentes approches fonctionnent entre elles pour assurer les plus grands avantages avec le minimum de cons\u00e9quences impr\u00e9vues, dit M. Guariguata.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><b>INTERVENTIONS NATURELLES<\/b><\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Les parcelles agroforesti\u00e8res peuvent servir de \u00abpierre de gu\u00e9\u00bb qui permet aux abeilles, aux oiseaux et aux animaux de disperser le pollen ou les graines lorsqu&rsquo;ils se d\u00e9placent \u00e0 travers des zones de for\u00eats naturelles. Un processus qui peut permettre la reproduction des arbres dans les deux types de v\u00e9g\u00e9tation.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Dans les lieux o\u00f9 certaines esp\u00e8ces des for\u00eats naturelles ne peuvent pas s&rsquo;adapter au rythme du changement climatique, la conservation sur des <a href=\"\/\/www.cifor.org\/online-library\/browse\/view-publication\/publication\/3374.html\" target=\"_blank\">parcelles agroforesti\u00e8res peut alors offrir la seule chance de survie<\/a>*, dit M. Dawson.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Les scientifiques ont besoin de plus d&rsquo;informations sur la fa\u00e7on dont les diff\u00e9rentes esp\u00e8ces se reproduisent et sur leur densit\u00e9 de population &#8211; le nombre d&rsquo;arbres dans une r\u00e9gion donn\u00e9e qui est n\u00e9cessaire \u00e0 leur survie, ajoute-t-il.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Les for\u00eats tropicales <a href=\"\/\/www.cifor.org\/online-library\/browse\/view-publication\/publication\/1183.html\" target=\"_blank\">abritent une grande diversit\u00e9 d&rsquo;esp\u00e8ces<\/a>*. Lorsque les petits agriculteurs trouvent des arbres qui sont particuli\u00e8rement int\u00e9ressants comme bois d&rsquo;\u0153uvre, comme combustible, pour les fruits, la m\u00e9decine ou d&rsquo;autres utilisations, ils peuvent les transplanter ou semer leurs graines dans leurs propres parcelles agroforesti\u00e8res. En cons\u00e9quence, les parcelles des agriculteurs ont \u00e9galement tendance \u00e0 poss\u00e9der une grande diversit\u00e9 d&rsquo;esp\u00e8ces.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">\u00ab\u00c0 premi\u00e8re vue, cela semble positif, mais son efficacit\u00e9 pour la conservation d\u00e9pend des types d&rsquo;esp\u00e8ces et du nombre d&rsquo;individus par esp\u00e8ce\u00bb, d\u00e9clare M. Dawson.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Si les agriculteurs optent pour des esp\u00e8ces exotiques, ils risquent d&rsquo;\u00e9vincer les esp\u00e8ces indig\u00e8nes, contrecarrant les objectifs de conservation, dit-il. Et s&rsquo;il y a trop peu d&rsquo;arbres d&rsquo;une esp\u00e8ce donn\u00e9e, ils peuvent \u00eatre trop \u00e9loign\u00e9s pour pouvoir \u00eatre pollinis\u00e9s et se reproduire.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Si seulement quelques arbres se pollinisent les uns les autres, le r\u00e9sultat peut en \u00eatre la consanguinit\u00e9, conduisant \u00e0 des arbres plus faibles, moins susceptibles de survivre.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Quand une esp\u00e8ce est gravement menac\u00e9e \u00e0 l&rsquo;\u00e9tat sauvage, les scientifiques peuvent opter pour la conservation <\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>ex situ<\/i><\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">, parfois loin de l&rsquo;habitat d&rsquo;origine, pour s&rsquo;assurer qu&rsquo;elle ne soit pas perdue pour toujours.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Cela peut conduire \u00e0 stocker les graines dans une banque de semences, dans des conditions soigneusement contr\u00f4l\u00e9es, ou planter des arbres sur un site r\u00e9serv\u00e9 \u00e0 une \u00abbanque de g\u00e8nes\u00bb.<\/span><\/span><\/p>\n<figure id=\"attachment_19109\" aria-describedby=\"caption-attachment-19109\" style=\"width: 500px\" class=\"wp-caption alignnone\"><a href=\"http:\/\/www.forestsnews.org\/wp-content\/uploads\/2013\/09\/icraf-gene-bank.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"size-large wp-image-19109 \" alt=\"Ketika satu spesies pohon sangat terancam di alam, ilmuwan bisa memilih untuk menyimpan benih jauh dari habitat asli untuk memastikan mereka tidak punah. World Agroforestry Centre.\" src=\"\/\/www.forestsnews.org\/wp-content\/uploads\/2013\/09\/icraf-gene-bank-500x332.jpg\" width=\"500\" height=\"332\" \/><\/a><figcaption id=\"caption-attachment-19109\" class=\"wp-caption-text\">Quand une esp\u00e8ce d&rsquo;arbre est gravement menac\u00e9e \u00e0 l&rsquo;\u00e9tat sauvage, les scientifiques peuvent opter pour une conservation loin de l&rsquo;habitat d&rsquo;origine, pour s&rsquo;assurer qu&rsquo;elle ne soit pas perdue pour toujours. Photo: <a href=\"http:\/\/www.flickr.com\/photos\/icraf\/sets\/72157633206945789\/\" target=\"_blank\">World Agroforestry Centre<\/a>.<\/figcaption><\/figure>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Cependant, il y a des inconv\u00e9nients \u00e0 la conservation <\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>ex situ<\/i><\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">. Les graines d&rsquo;arbres ne survivent pas \u00e0 un stockage sur le long terme, comme contrairement aux semences de cultures vivri\u00e8res, dit M. Dawson, et quand elles le font, il faut un temps beaucoup plus long de croissance pour qu&rsquo;elles arrivent \u00e0 maturit\u00e9.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">La conservation <\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>ex situ<\/i><\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"> des arbres a donc tendance \u00e0 \u00eatre co\u00fbteuse et pourrait priver de fonds des strat\u00e9gies de conservation plus rentables, dit-il. Le compromis pourrait \u00eatre de planter des arbres menac\u00e9s d&rsquo;extinction dans les jardins botaniques, ce qui pourrait alors favoriser l&rsquo;\u00e9ducation et la sensibilisation, tout en conservant l&rsquo;esp\u00e8ce, disent les auteurs de l&rsquo;article.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Malgr\u00e9 ces d\u00e9couvertes, beaucoup de questions demeurent quant \u00e0 la fa\u00e7on dont l&rsquo;agroforesterie peut contribuer \u00e0 la conservation.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Les scientifiques doivent apprendre davantage sur les plantations ou si les politiques, telles que la certification, aident vraiment \u00e0 conserver les esp\u00e8ces \u00e0 l&rsquo;\u00e9tat sauvage \u2013 une recherche qui impliquera l&rsquo;\u00e9tude de l&rsquo;\u00e9cologie et de la g\u00e9n\u00e9tique, dit M. Guariguata.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Puisque les petits agriculteurs ne cessent de <a href=\"\/\/www.cifor.org\/publications\/pdf_files\/Books\/BMichon0501E0.pdf\" target=\"_blank\">domestiquer des esp\u00e8ces sauvages<\/a>* qui leur sont utiles, les chercheurs peuvent apprendre beaucoup en \u00e9tudiant comment les agriculteurs g\u00e8rent \u00e0 la fois les arbres sauvages et domestiques, ainsi que la fa\u00e7on dont les populations sauvages et domestiques interagissent, dit-il.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">Une question cruciale est de savoir comment un climat en r\u00e9chauffement influencera les for\u00eats tropicales, dit M. Dawson.<\/span><\/span><\/p>\n<p><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\">\u00abUne des principales pr\u00e9occupations est de savoir si le changement climatique aura une incidence sur les populations de pollinisateurs et ce que \u00e7a pourrait impliquer pour les esp\u00e8ces d&rsquo;arbres\u00bb, ajoute-t-il. \u00abCeci est particuli\u00e8rement important dans les paysages agricoles, o\u00f9 la conservation d\u00e9pend aussi de la valeur de l&rsquo;esp\u00e8ce pour les agriculteurs.\u00bb<\/span><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><b>Pour plus d&rsquo;informations sur les sujets abord\u00e9s dans ce blog, veuillez contacter Manuel Guariguata sur <\/b><\/span><\/span><\/span><span style=\"color: #0000ff;\"><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><span style=\"text-decoration: underline;\"><b>m.guariguata@cgiar.org<\/b><\/span><\/span><\/span><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>Ce travail a \u00e9t\u00e9 financ\u00e9 par le <\/i><\/span><\/span><\/span><span style=\"color: #000080;\"><span style=\"text-decoration: underline;\"><a href=\"http:\/\/www.cgiar.org\/our-research\/cgiar-research-programs\/cgiar-research\" target=\"_blank\" rel=\"noopener noreferrer nofollow\"><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>Programme de recherche du CGIAR sur les for\u00eats, les arbres et l&rsquo;agroforesterie<\/i><\/span><\/span><\/a><\/span><\/span><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>.<\/i><\/span><\/span><\/p>\n<p><span style=\"color: #000000;\"><span style=\"font-family: Tahoma, sans-serif;\"><span style=\"font-size: small;\"><i>* Liens non traduits en fran\u00e7ais<\/i><\/span><\/span><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Bogor, Indon\u00e9sie (16 september 2013) _ Quand les for\u00eats naturelles sont menac\u00e9es par la d\u00e9forestation ou le changement climatique, la meilleure mani\u00e8re d&rsquo;assurer la survie de certaines esp\u00e8ces en danger serait de les ins\u00e9rer dans des parcelles agroforesti\u00e8res g\u00e9r\u00e9es par des petits exploitants, selon une nouvelle \u00e9tude. Un article des chercheurs du Centre de recherche [&hellip;]<\/p>\n","protected":false},"author":84,"featured_media":0,"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":[462,137,1072,186,184],"tags":[479],"language":[2170],"location":[],"tag-bahasa":[],"tag-espanol":[],"tag-francais":[],"type-espanol":[],"type-bahasa":[],"type-english":[],"type-francais":[],"coauthors":[831],"class_list":["post-19270","post","type-post","status-publish","format-standard","hentry","category-climate-change-energy","category-forest-management-restoration","category-landscapes","category-production-forests","category-value-chains-finance","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>Les parcelles agroforesti\u00e8res des petites exploitations peuvent renforcer la conservation des arbres - 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\/19270\/les-parcelles-agroforestieres-des-petites-exploitations-peuvent-renforcer-la-conservation-des-arbres\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les parcelles agroforesti\u00e8res des petites exploitations peuvent renforcer la conservation des arbres\" \/>\n<meta property=\"og:description\" content=\"Bogor, Indon\u00e9sie (16 september 2013) _ Quand les for\u00eats naturelles sont menac\u00e9es par la d\u00e9forestation ou le changement climatique, la meilleure mani\u00e8re d&rsquo;assurer la survie de certaines esp\u00e8ces en danger serait de les ins\u00e9rer dans des parcelles agroforesti\u00e8res g\u00e9r\u00e9es par des petits exploitants, selon une nouvelle \u00e9tude. 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