{"id":223,"date":"2014-08-18T12:00:41","date_gmt":"2014-08-18T16:00:41","guid":{"rendered":"http:\/\/www.frfce.qc.ca\/?page_id=223"},"modified":"2014-08-25T14:19:25","modified_gmt":"2014-08-25T18:19:25","slug":"effet-du-nerprun-bourdaine-sur-la-regeneration-des-arbres-et-sur-les-herbacees-forestieres","status":"publish","type":"page","link":"https:\/\/www.frfce.qc.ca\/?page_id=223","title":{"rendered":"Effet du nerprun bourdaine sur la r\u00e9g\u00e9n\u00e9ration des arbres et sur les herbac\u00e9es foresti\u00e8res"},"content":{"rendered":"<p><strong>Mise en contexte<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignright size-full wp-image-134\" src=\"http:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_bourdaine.png\" alt=\"nerprun bourdaine\" width=\"200\" height=\"200\" srcset=\"https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_bourdaine.png 200w, https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_bourdaine-150x150.png 150w, https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_bourdaine-50x50.png 50w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/p>\n<p>Plusieurs \u00e9tudes r\u00e9alis\u00e9es aux \u00c9tats-Unis ces derni\u00e8res ann\u00e9es sugg\u00e8rent que le nerprun bourdaine, un arbuste exotique envahissant (voir <a title=\"\u00c9tude de la distribution du nerprun bourdaine en peuplements naturels\" href=\"http:\/\/www.frfce.qc.ca\/?page_id=172\">\u00c9tude de la distribution du nerprun bourdaine en peuplements naturels<\/a>), peut causer une r\u00e9duction de la survie et de la croissance de la r\u00e9g\u00e9n\u00e9ration foresti\u00e8re en sous-bois. Toutefois, on ne peut pas affirmer avec certitude \u00e0 partir de quel seuil d\u2019abondance et dans quelles conditions \u00e9cologiques le nerprun devient r\u00e9ellement nuisible pour la flore foresti\u00e8re. Ceci est d\u00fb aux nombreux facteurs \u00e9cologiques confondants (qualit\u00e9 du site, type de peuplement, climat, impact de la faune, etc.) qui rendent difficile l\u2019\u00e9tablissement de corr\u00e9lations claires entre la pr\u00e9sence ou l\u2019abondance du nerprun et son effet pr\u00e9sum\u00e9 sur la r\u00e9g\u00e9n\u00e9ration foresti\u00e8re.<\/p>\n<p>&nbsp;<\/p>\n<p>Pr\u00e9sentement, l\u2019effet du nerprun sur la flore foresti\u00e8re du sud qu\u00e9b\u00e9cois demeure non quantifi\u00e9 puisque peu d\u2019\u00e9tudes s\u2019y sont attard\u00e9es. Il est donc important de r\u00e9aliser une exp\u00e9rience pour mesurer cet effet n\u00e9gatif pr\u00e9sum\u00e9 du nerprun, dans un milieu forestier relativement homog\u00e8ne o\u00f9 l\u2019on contr\u00f4lera un maximum de facteurs \u00e9cologiques. Cela permettra d\u2019isoler l\u2019impact r\u00e9el du nerprun bourdaine sur la r\u00e9g\u00e9n\u00e9ration ligneuse et les plantes herbac\u00e9es foresti\u00e8res.<\/p>\n<p>&nbsp;<\/p>\n<p><strong>Dispositif de recherche<\/strong><\/p>\n<p>Ce projet utilise comme environnement d\u2019\u00e9tude une plantation de peuplier hybride mature (15 ans) o\u00f9 l\u2019on observe, depuis d\u00e9j\u00e0 quelques ann\u00e9es, un gradient d\u2019abondance du nerprun bourdaine sous les peupliers. Ce gradient d\u2019abondance du nerprun est inversement proportionnel au gradient de croissance (ou de taille) des peupliers observ\u00e9s sur le site.<\/p>\n<p>&nbsp;<\/p>\n<p>En octobre 2013, un d\u00e9gagement chimique (glyphosate) a \u00e9t\u00e9 r\u00e9alis\u00e9 sur la moiti\u00e9 de chaque parcelle exp\u00e9rimentale, de fa\u00e7on \u00e0 cr\u00e9er un milieu sans nerprun et un milieu avec du nerprun. Quelques jours plus tard, de la chaux a \u00e9t\u00e9 appliqu\u00e9e dans les parcelles o\u00f9 ont \u00e9t\u00e9 plant\u00e9es les herbac\u00e9es foresti\u00e8res (le printemps suivant), de fa\u00e7on \u00e0 am\u00e9liorer les conditions du sol pour les plantes calcicoles. Au printemps 2014, l\u2019ensemble de la plantation de peuplier a \u00e9t\u00e9 cl\u00f4tur\u00e9 de fa\u00e7on \u00e0 \u00e9liminer l\u2019impact potentiel du cerf sur l\u2019exp\u00e9rience.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_chene_rouge_herbicide.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-225\" src=\"http:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_chene_rouge_herbicide.png\" alt=\"effets du nerprun ch\u00eane rouge dans l'herbicide\" width=\"200\" height=\"200\" srcset=\"https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_chene_rouge_herbicide.png 200w, https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_chene_rouge_herbicide-150x150.png 150w, https:\/\/www.frfce.qc.ca\/wp-content\/uploads\/2014\/08\/nerprun_chene_rouge_herbicide-50x50.png 50w\" sizes=\"auto, (max-width: 200px) 100vw, 200px\" \/><\/a>En mai 2014, des plants de ch\u00eane rouge et d\u2019\u00e9rable \u00e0 sucre ont \u00e9t\u00e9 mis en terre dans les parcelles. Ces esp\u00e8ces ont \u00e9t\u00e9 s\u00e9lectionn\u00e9es puisqu\u2019elles pr\u00e9sentent une tol\u00e9rance diff\u00e9rente \u00e0 l\u2019ombre; l\u2019\u00e9rable \u00e0 sucre \u00e9tant tr\u00e8s tol\u00e9rant \u00e0 l\u2019ombre alors que le ch\u00eane rouge tol\u00e8re mod\u00e9r\u00e9ment l\u2019ombre. Ce choix d\u2019esp\u00e8ce permettra de voir si le nerprun affecte la r\u00e9g\u00e9n\u00e9ration ligneuse en fonction de sa tol\u00e9rance \u00e0 l\u2019ombre. Parall\u00e8lement, 4 plantes herbac\u00e9es foresti\u00e8res (la sanguinaire, le gingembre sauvage, le caulophylle faux-pigamon et le sceau de Salomon) ont \u00e9t\u00e9 mise en terre. Deux d\u2019entre elles sont l\u00e9galement d\u00e9sign\u00e9es comme \u00ab vuln\u00e9rables \u00bb au Qu\u00e9bec, soit la sanguinaire et le gingembre sauvage. Trois d\u2019entre elles sont \u00e9galement des produits forestiers non ligneux (PFNL) bien connus.<\/p>\n<p>&nbsp;<\/p>\n<p>Au total 480 plants d\u2019arbres et 1 008 plants d\u2019herbac\u00e9es foresti\u00e8res ont \u00e9t\u00e9 plant\u00e9s sous les peupliers. La moiti\u00e9 de ceux-ci se trouve dans un environnement o\u00f9 le nerprun a \u00e9t\u00e9 \u00e9limin\u00e9 par d\u00e9gagement chimique. L\u2019autre moiti\u00e9 se trouve dans un environnement qui pr\u00e9sente un gradient d\u2019abondance de nerprun. Un tel dispositif permettra de d\u00e9terminer avec pr\u00e9cision dans quelle mesure le nerprun est nuisible pour les plantes de sous-bois et pour la r\u00e9g\u00e9n\u00e9ration foresti\u00e8re, ainsi qu\u2019\u00e0 partir de quelle densit\u00e9 de nerprun cet effet se produit.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\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: 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Toutefois, on ne peut pas affirmer avec [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":20,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-223","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages\/223","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=223"}],"version-history":[{"count":8,"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages\/223\/revisions"}],"predecessor-version":[{"id":400,"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages\/223\/revisions\/400"}],"up":[{"embeddable":true,"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=\/wp\/v2\/pages\/20"}],"wp:attachment":[{"href":"https:\/\/www.frfce.qc.ca\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}