{"id":82577,"date":"2020-05-28T15:19:54","date_gmt":"2020-05-28T19:19:54","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/physiological-responses-black-spruce-layers-planted-seedlings-nutrient-addition\/"},"modified":"2020-05-28T15:19:54","modified_gmt":"2020-05-28T19:19:54","slug":"physiological-responses-black-spruce-layers-planted-seedlings-nutrient-addition","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/physiological-responses-black-spruce-layers-planted-seedlings-nutrient-addition\/","title":{"rendered":"Physiological responses of black spruce layers and planted seedlings to nutrient addition"},"content":{"rendered":"\n

Published in Tree Physiology 20: 229-238<\/strong><\/p>

We investigated effects of nutrient addition on several physiological characteristics of 60-cm-tall black spruce (Picea mariana <\/em>Mill. B.S.P.) layers (i.e., rooted branches of overstory trees) and 20-cm-tall planted seedlings on a clear-cut, N-limited boreal site. After two growing seasons, current-year and one-year-old needles of fertilized trees (layers and seedlings combined) had higher net photosynthetic rates (A<\/em>n<\/sub>) and maximum capacity of Rubisco for CO2<\/sub> fixation (V<\/em>max<\/sub>) than unfertilized trees. One-year-old needles of fertilized trees had higher stomatal conductance (g<\/em>s<\/sub>), higher water-use efficiency, and lower intercellular to ambient CO2<\/sub> ratio than unfertilized trees. Additionally, fertilized trees had higher predawn and midday shoot water potentials than unfertilized trees.<\/p>

Stomatal conductance of 1-year-old needles was 23% higher in seedlings than in layers, but there were no significant differences in g<\/em>s<\/sub> of current-year needles between the regeneration types. For both needle age-classes, A<\/em>n<\/sub> and V<\/em>max<\/sub> of layers were 25 and 40% higher, respectively, than the corresponding values for seedlings. The higher values of A<\/em>n<\/sub>, V<\/em>max<\/sub> and foliar N concentration of layers compared with seedlings after two growing seasons may be associated with the larger root systems of the layers compared with the transplanted seedlings.<\/p>\n","protected":false},"excerpt":{"rendered":"

Published in Tree Physiology 20: 229-238 We investigated effects of nutrient addition on several physiological characteristics of 60-cm-tall black spruce (Picea mariana Mill. B.S.P.) layers (i.e., rooted branches of overstory trees) and 20-cm-tall planted seedlings on a clear-cut, N-limited boreal site. After two growing seasons, current-year and one-year-old needles of fertilized trees (layers and seedlings […]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1180,1181,1182],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[],"class_list":["post-82577","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"],"acf":[],"yoast_head":"\nPhysiological responses of black spruce layers and planted seedlings to nutrient addition - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"Stomatal conductance of 1-year-old needles was 23% higher in seedlings than in layers, but there were no significant differences in gs of current-year ...\" \/>\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\/physiological-responses-black-spruce-layers-planted-seedlings-nutrient-addition\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Physiological responses of black spruce layers and planted seedlings to nutrient addition - 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