{"id":82061,"date":"2020-07-27T14:56:50","date_gmt":"2020-07-27T18:56:50","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/change-water-relations-balsam-fir-white-birch-saplings-thinning\/"},"modified":"2020-07-27T14:56:50","modified_gmt":"2020-07-27T18:56:50","slug":"change-water-relations-balsam-fir-white-birch-saplings-thinning","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/change-water-relations-balsam-fir-white-birch-saplings-thinning\/","title":{"rendered":"Changes in the water relations of balsam fir and white birch saplings after thinning"},"content":{"rendered":"\n<p>Published in <strong>Tree Physiology 6: 371-380<\/strong><\/p>\n<p>ln the autumn of 1987, young balsam fir (<em>Abies balsamea <\/em>(L.) Mill.) and white birch (<em>Betula papyrifera <\/em>Marsh.) trees were thinned and their water relations followed during the next two growing seasons. At the beginning of the first summer following treatment, thinned trees of both species had lower osmotic potentials at full saturation (Y<sub>p,<\/sub><sub>sat<\/sub>) and at turgor loss point (Y<sub>p,<\/sub><sub>tlp<\/sub>) compared with controls. At this time, Y<sub>p,<\/sub><sub>sat <\/sub>was linearly related to the percentage of full sunlight reaching the trees. A higher sugar concentration in leaves was an important component of the lower Y<sub>p,<\/sub><sub>sat <\/sub>of thinned trees. For the other two sampling dates during the first growing season after treatment and all three sampling dates during the second growing season after treatment, little osmotic adjustment of the thinned trees relative to the control trees was observed in either species. The absence of osmotic adjustment during the second growing season following thinning suggests that other mechanisms were responsible for the acclimation of the treated trees to the higher atmospheric evaporative demand. Sapwood permeability (<em>k<\/em>) of white birch was higher than that of balsam fir, but no differences in <em>k<\/em> or in sapwood area were found between treated and control trees of either species. Predawn water potentials (Y<sub>pred<\/sub>) of treated trees were less negative than those of controls.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Published in Tree Physiology 6: 371-380 ln the autumn of 1987, young balsam fir (Abies balsamea (L.) Mill.) and white birch (Betula papyrifera Marsh.) trees were thinned and their water relations followed during the next two growing seasons. At the beginning of the first summer following treatment, thinned trees of both species had lower osmotic [&hellip;]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1180,1181],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[],"class_list":["post-82061","cpt_publication","type-cpt_publication","status-publish","format-standard","hentry","cptt_secteur-forests","cptt_theme-forestry-research","cptt_theme-forests","cptt_categ_publi-scientific-article"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Changes in the water relations of balsam fir and white birch saplings after thinning - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"Article about changes in the water relations of balsam fir and white birch saplings after thinning\" \/>\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\/change-water-relations-balsam-fir-white-birch-saplings-thinning\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Changes in the water relations of balsam fir and white birch saplings after thinning - 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