{"id":3327,"date":"2025-07-01T13:16:33","date_gmt":"2025-07-01T13:16:33","guid":{"rendered":"https:\/\/optmix.efno.fr\/?p=3327"},"modified":"2025-07-07T05:55:46","modified_gmt":"2025-07-07T05:55:46","slug":"article-paru-la-composition-et-la-densite-du-peuplement-ont-elles-une-influence-sur-le-deficit-foliaire","status":"publish","type":"post","link":"https:\/\/optmix.efno.fr\/?p=3327","title":{"rendered":"Article paru : La composition et la densit\u00e9 du peuplement ont-elles une influence sur le d\u00e9ficit foliaire ?"},"content":{"rendered":"<p>Un article vient de para\u00eetre dans la revue \u00ab\u00a0Forest Ecology and Management\u00a0\u00bb sur l&rsquo;effet de la composition et de la densit\u00e9 du peuplement sur le d\u00e9ficit foliaire du ch\u00eane sessile et du pin sylvestre pendant les 5 ann\u00e9es suivant un \u00e9pisode de s\u00e9cheresse caniculaire :<\/p>\n<p>Javoy, T., Perret, S., Perot, T., (2025). How do mixing tree species and stand density affect crown defoliation after heat-drought events? FOREST ECOLOGY AND MANAGEMENT 586. <a href=\"https:\/\/doi.org\/10.1016\/j.foreco.2025.122684\" target=\"_blank\" rel=\"noopener\">https:\/\/doi.org\/10.1016\/j.foreco.2025.1226844<\/a><\/p>\n<p><span style=\"text-decoration: underline;\"><strong>Les points forts :<\/strong><\/span><\/p>\n<ul>\n<li>Le d\u00e9ficit foliaire a \u00e9t\u00e9 suivi sur environ 300 ch\u00eanes sessiles et 300 pin sylvestre de 2020 \u00e0 2024 sur 18 placettes du dispositif OPTMix ;<\/li>\n<li>Le d\u00e9ficit foliaire des ch\u00eanes a augment\u00e9 de mani\u00e8re constante au cours du temps avec une pente plus forte en peuplement m\u00e9lang\u00e9 qu&rsquo;en peuplement pur ;<\/li>\n<li>Le d\u00e9ficit foliaire des pins a augment\u00e9 de mani\u00e8re plus forte en peuplement pur qu&rsquo;en m\u00e9lange puis a diminu\u00e9 en 2024 ;<\/li>\n<li>Pour les deux esp\u00e8ces les arbres les plus gros pr\u00e9sentaient un d\u00e9ficit foliaire plus faible que les plus petits ;<\/li>\n<li>Nous n&rsquo;avons pas mis en \u00e9vidence d&rsquo;effet de la densit\u00e9 du peuplement sur le d\u00e9ficit foliaire des deux esp\u00e8ces.<\/li>\n<\/ul>\n<p><span style=\"text-decoration: underline;\"><strong>R\u00e9sum\u00e9<\/strong><\/span><\/p>\n<p>Severe droughts and heat waves have increased over the last decades, leading to forest dieback worldwide. In this context, reducing stand density and mixing tree species are two silvicultural options being investigated by forest managers to limit the impact of climate change on forest health and productivity. We studied tree size effect and stand composition and density effects on crown defoliation in adult trees belonging to two species: sessile oak (Quercus petraea, Matt. (Liebl.)) and Scots pine (Pinus sylvestris, L.). We monitored tree crown defoliation at 18 experimental plots located in central France for five consecutive years following the extreme heat wave of 2019. Our results highlight two different dynamics for crown defoliation in the two tree species. For Scots pine, we observed an abrupt severe increase in defoliation followed by a significant decrease in 2024, while sessile oak, crown defoliation continued to increase steadily after 2020. For both species, larger trees had significantly less crown defoliation than small trees. We found higher defoliation for sessile oak in mixtures and conversely, higher defoliation for Scots pine in pure stands. Finally, we found no difference in crown defoliation between low-density and medium-density stands for either species.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un article vient de para\u00eetre dans la revue \u00ab\u00a0Forest Ecology and Management\u00a0\u00bb sur l&rsquo;effet de la composition et de la densit\u00e9 du peuplement sur le d\u00e9ficit foliaire du ch\u00eane sessile et du pin sylvestre pendant les 5 ann\u00e9es suivant un \u00e9pisode de s\u00e9cheresse caniculaire : Javoy, T., Perret, S., Perot, T., (2025). How do mixing &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"https:\/\/optmix.efno.fr\/?p=3327\">Lire la suite<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=\/wp\/v2\/posts\/3327"}],"collection":[{"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3327"}],"version-history":[{"count":9,"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=\/wp\/v2\/posts\/3327\/revisions"}],"predecessor-version":[{"id":3357,"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=\/wp\/v2\/posts\/3327\/revisions\/3357"}],"wp:attachment":[{"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3327"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3327"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/optmix.efno.fr\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3327"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}