{"id":81933,"date":"2019-01-30T12:10:24","date_gmt":"2019-01-30T17:10:24","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/mortality-rates-height-and-average-trees\/"},"modified":"2019-01-30T12:10:24","modified_gmt":"2019-01-30T17:10:24","slug":"mortality-rates-height-and-average-trees","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/mortality-rates-height-and-average-trees\/","title":{"rendered":"A comparison of mortality rates between top height trees and average site trees"},"content":{"rendered":"\n<p>Published in\u00a0<b>Annals of Forest Science 66(2)<\/b><\/p>\n<p>Although comparisons between methods of selecting trees for site index estimates are well documented in the literature, little is known on mortality rates of different canopy tree cohorts used for that purpose.<\/p>\n<p>This study was initiated to test the hypothesis that the mortality rates of top height trees are lower than those of codominants only or a combination of codominant and dominant trees. To test this hypothesis, we used records from a network of permanent sample plots in Qu\u00e9bec and studied the fate of different cohorts of site trees for five different species.<\/p>\n<p>Our results did not show clear evidence of lower mortality rates for top height trees. Instead we found that depending on the species, top height trees have lower (<em>Populus tremuloides, Pinus banksiana<\/em>), higher (<em>Picea mariana, Abies balsamea<\/em>) or equal mortality rates (<em>Betula papyrifera<\/em>) than codominant trees or codominant and dominant trees combined.<\/p>\n<p>These results suggest a tendency for shade intolerant species to maintain lower top height tree mortality rates over time when compared to shade tolerant species. In the latter case, it is also shown that spruce budworm epidemics (<em>Choristoneura fumiferana<\/em>) did not change the pattern of mortality rates of site trees of <em>A. balsamea.<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Published in\u00a0Annals of Forest Science 66(2) Although comparisons between methods of selecting trees for site index estimates are well documented in the literature, little is known on mortality rates of different canopy tree cohorts used for that purpose. This study was initiated to test the hypothesis that the mortality rates of top height trees are [&hellip;]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1180,1181,1182],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[1065,1090],"class_list":["post-81933","cpt_publication","type-cpt_publication","status-publish","format-standard","hentry","cptt_secteur-forests","cptt_theme-forestry-research","cptt_theme-forests","cptt_theme-silviculture","cptt_categ_publi-scientific-article","cptt_auteurs_ministeriels-i-auger","cptt_auteurs_ministeriels-hebert-francois-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>A comparison of mortality rates between top height trees and average site trees - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"These results suggest a tendency for shade intolerant species to maintain lower top height tree mortality rates over time when compared to shade...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/mortality-rates-height-and-average-trees\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"A comparison of mortality rates between top height trees and average site trees - 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