{"id":182,"date":"2014-08-18T10:33:51","date_gmt":"2014-08-18T14:33:51","guid":{"rendered":"http:\/\/www.frfce.qc.ca\/?page_id=182"},"modified":"2014-08-25T14:55:52","modified_gmt":"2014-08-25T18:55:52","slug":"distribution-abondance-et-etat-de-sante-du-noyer-cendre","status":"publish","type":"page","link":"https:\/\/www.frfce.qc.ca\/?page_id=182","title":{"rendered":"Distribution, abondance et \u00e9tat de sant\u00e9 du noyer cendr\u00e9"},"content":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-137\" src=\"http:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/noyer_cendre.png\" alt=\"Noyer cendr\u00e9\" width=\"200\" height=\"200\" srcset=\"https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/noyer_cendre.png 200w, https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/noyer_cendre-150x150.png 150w, https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/noyer_cendre-50x50.png 50w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/p>\n<p><strong>Mise en contexte<\/strong><\/p>\n<p>Plusieurs esp\u00e8ces d\u2019arbres de nos for\u00eats sont en d\u00e9clin \u00e0 cause de maladies fongiques introduites \u00e0 partir d\u2019autres continents. C\u2019est le cas de la maladie hollandaise de l\u2019orme et de la br\u00fblure du ch\u00e2taignier. Le noyer cendr\u00e9, seul noyer indig\u00e8ne au Qu\u00e9bec, est lui aussi attaqu\u00e9 depuis quelques d\u00e9cennies par un champignon exotique tr\u00e8s virulent, le chancre du noyer. Ce pathog\u00e8ne est aujourd\u2019hui pr\u00e9sent dans l\u2019ensemble de l\u2019aire de distribution du noyer cendr\u00e9. \u00c0 cause de la rapidit\u00e9 avec laquelle le champignon se propage et de la mortalit\u00e9 \u00e9lev\u00e9e qu\u2019il cause, le noyer cendr\u00e9 a re\u00e7u, en 2003, le statut d\u2019esp\u00e8ce en voie de disparition au Canada.<\/p>\n<p>&nbsp;<\/p>\n<p>Malgr\u00e9 ce statut, l\u2019habitat du noyer cendr\u00e9, ainsi que la localisation et l\u2019\u00e9tat de sant\u00e9 des individus et des peuplements sont mal connus. En 2009, nous avons entrepris une \u00e9tude dans les for\u00eats priv\u00e9es de la grande r\u00e9gion des Cantons-de-l\u2019Est de fa\u00e7on \u00e0 identifier les principaux facteurs \u00e9cologiques influen\u00e7ant l\u2019abondance et \u00e0 la croissance du noyer cendr\u00e9, mais \u00e9galement la fr\u00e9quence de son infection par le chancre.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Sites \u00e0 l\u2019\u00e9tude<\/strong><\/p>\n<p>Au total, 60 propri\u00e9taires forestiers poss\u00e9dant des noyers ont \u00e9t\u00e9 contact\u00e9s et 35 d\u2019entre eux ont \u00e9t\u00e9 s\u00e9lectionn\u00e9s pour l\u2019\u00e9tude. Un total de 90 parcelles foresti\u00e8res (400 m<sup>2 <\/sup>\/ parcelle) ont \u00e9t\u00e9 \u00e9chantillonn\u00e9es, dont 35 contenaient du noyer cendr\u00e9.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Faits saillants<\/strong><\/p>\n<p>Dans chaque parcelle, le type de communaut\u00e9 foresti\u00e8re a \u00e9t\u00e9 identifi\u00e9 et les variables environnementales mesur\u00e9es. Dans les parcelles contenant du noyer, son abondance, sa croissance et son \u00e9tat de sant\u00e9 ont \u00e9t\u00e9 \u00e9valu\u00e9s (circonf\u00e9rence du tronc affect\u00e9e et pourcentage de mort en cime). Au total, 163 noyers ont fait l&rsquo;objet d&rsquo;une \u00e9valuation d\u00e9taill\u00e9e de leur \u00e9tat de sant\u00e9. Les principaux r\u00e9sultats sont les suivants\u00a0:<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li><img loading=\"lazy\" decoding=\"async\" class=\"alignright wp-image-183 size-full\" src=\"http:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/noyer_cendre_chancre.png\" alt=\"noyer cendr\u00e9 chancre\" width=\"200\" height=\"200\" srcset=\"https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/noyer_cendre_chancre.png 200w, https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/noyer_cendre_chancre-150x150.png 150w, https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/noyer_cendre_chancre-50x50.png 50w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/>Le noyer est pr\u00e9sent dans deux types de milieux forestiers, soit les plaines de d\u00e9bordement de rivi\u00e8res et les for\u00eats feuillues sur des sols bien drain\u00e9s (site m\u00e9sique) et relativement riches.<\/li>\n<li>C\u2019est dans les plaines de d\u00e9bordement, des milieux au sol riche, que le noyer cendr\u00e9 est plus abondant.<\/li>\n<li>En 2009, le pourcentage de noyers les plus s\u00e9v\u00e8rement affect\u00e9s par le chancre \u00e9tait plus \u00e9lev\u00e9 dans les plaines de d\u00e9bordement que dans les sites forestiers m\u00e9siques (30 % des individus contre 11 %). L\u2019abondance de mort en cime montrait un patron similaire entre les deux types d\u2019habitats.<\/li>\n<li>Parmi les 163 noyers localis\u00e9s en 2009, 8 \u00e9taient apparemment sains, 89 \u00e9taient faiblement atteints et 66 \u00e9taient fortement atteints par le chancre. Au total, 95 % des noyers avaient des sympt\u00f4mes apparents de la maladie.<\/li>\n<li>En 2012, une r\u00e9\u00e9valuation de l\u2019\u00e9tat de sant\u00e9 de ces m\u00eames noyers montrait un aggravement du d\u00e9p\u00e9rissement peu importe le milieu. En 2009, seulement 6 % des noyers \u00e9taient associ\u00e9s \u00e0 la classe de mort en cime la plus \u00e9lev\u00e9e (75-100 %), alors qu\u2019en 2012, plus de 27 % des noyers \u00e9taient retrouv\u00e9s dans cette classe.<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>D&rsquo;apr\u00e8s ces r\u00e9sultats, d&rsquo;\u00e9ventuelles plantations d&rsquo;enrichissement ou de r\u00e9introduction auraient avantage \u00e0 \u00eatre r\u00e9alis\u00e9es dans les milieux m\u00e9siques \u00e0 sols riches en calcium. Dans ces milieux, la croissance du noyer est comparable \u00e0 la croissance en plaine de d\u00e9bordement, mais la maladie y est moins pr\u00e9sente.\u00a0Les hauts taux d\u2019infection et de mortalit\u00e9 observ\u00e9s, ainsi que l\u2019aggravement du d\u00e9p\u00e9rissement observ\u00e9 de 2009 \u00e0 2012, sugg\u00e8rent toutefois qu\u2019on aurait avantage \u00e0 trouver rapidement des individus r\u00e9sistants. Ceux-ci pourraient \u00eatre utilis\u00e9s en p\u00e9pini\u00e8re pour produire des plants r\u00e9sistants au chancre.<\/p>\n<p>&nbsp;<\/p>\n<p>Une autre strat\u00e9gie pourrait \u00eatre de croiser le noyer cendr\u00e9 avec des noyers asiatiques r\u00e9sistants au chancre; une strat\u00e9gie qui s\u2019est av\u00e9r\u00e9e efficace pour sauver le ch\u00e2taignier d\u2019Am\u00e9rique de l\u2019extinction. Le suivi \u00e0 long terme des peuplements de noyers \u00e9tudi\u00e9s permettra, notamment d\u2019\u00e9valuer si les individus apparemment sains vont le demeurer au fil des ann\u00e9es.<br \/>\n<style id=\"bwg-style-0\">    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails {      width: 604px;              justify-content: center;        margin:0 auto !important;              background-color: rgba(255, 255, 255, 0.00);            padding-left: 4px;      padding-top: 4px;      max-width: 100%;            }        #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item {    justify-content: flex-start;      max-width: 120px;            width: 120px !important;          }    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item a {       margin-right: 4px;       margin-bottom: 4px;    }    #bwg_container1_0 #bwg_container2_0 .bwg-container-0.bwg-standard-thumbnails .bwg-item0 {      padding: 0px; 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if( typeof bwg_main_ready == 'function' ) {            if ( jQuery(\"#bwg_container1_0\").height() ) {             bwg_main_ready(jQuery(\"#bwg_container1_0\"));            }          }        });      }    <\/script>    <\/p>\n<p>&nbsp;<\/p>\n<p><strong>Documentation \u00a0 \u00a0<\/strong><\/p>\n<p>Un m\u00e9moire de ma\u00eetrise et un article de transfert ont \u00e9t\u00e9 publi\u00e9s en lien avec ce projet\u00a0:<\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Tanguay, C., D. Gagnon, et B. Truax. 2011. Le noyer cendr\u00e9, arbre patrimonial menac\u00e9 de disparition. Progr\u00e8s Forestier (Hiver 2011):14-17. <a href=\"http:\/\/www.afsq.org\/progres_forestier\/archives\/essences\/2011Hiver.pdf\" target=\"_blank\">www.afsq.org\/progres_forestier\/archives\/essences\/2011Hiver.pdf<\/a><\/p>\n<p>&#8211;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Tanguay, C. 2011. Distribution, abondance et \u00e9tat de sant\u00e9 du noyer cendr\u00e9 (<em>Juglans cinerea<\/em>) en relation avec les gradients \u00e9cologiques dans les Cantons-de-l&rsquo;Est. M\u00e9moire de M.Sc. Universit\u00e9 du Qu\u00e9bec \u00e0 Montr\u00e9al, Montr\u00e9al (QC), Canada. M\u00e9moire de ma\u00eetrise en Biologie, Universit\u00e9 du Qu\u00e9bec \u00e0 Montr\u00e9al, Montr\u00e9al (QC), Canada. <a href=\"http:\/\/www.archipel.uqam.ca\/4359\/\" target=\"_blank\">www.archipel.uqam.ca\/4359\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Mise en contexte Plusieurs esp\u00e8ces d\u2019arbres de nos for\u00eats sont en d\u00e9clin \u00e0 cause de maladies fongiques introduites \u00e0 partir d\u2019autres continents. C\u2019est le cas de la maladie hollandaise de l\u2019orme et de la br\u00fblure du ch\u00e2taignier. Le noyer cendr\u00e9, seul noyer indig\u00e8ne au Qu\u00e9bec, est lui aussi attaqu\u00e9 depuis quelques d\u00e9cennies par un champignon [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":22,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-182","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages\/182","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=182"}],"version-history":[{"count":13,"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages\/182\/revisions"}],"predecessor-version":[{"id":403,"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages\/182\/revisions\/403"}],"up":[{"embeddable":true,"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages\/22"}],"wp:attachment":[{"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=182"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}