{"id":82262,"date":"2019-01-30T12:15:53","date_gmt":"2019-01-30T17:15:53","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/field-photosynthesis-measurements-black-spruce\/"},"modified":"2019-01-30T12:15:53","modified_gmt":"2019-01-30T17:15:53","slug":"field-photosynthesis-measurements-black-spruce","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/field-photosynthesis-measurements-black-spruce\/","title":{"rendered":"Field photosynthesis measurements on black spruce (Picea mariana): Does needle age matter?"},"content":{"rendered":"\n

Published in Communications in Soil Science and Plant Analysis 42: 2738-2750<\/b><\/p>\n

Black spruce (Picea mariana<\/em>) trees have needles that persist for a number of years, and it is not clear which age class should be evaluated for photosynthesis to best understand physiological responses. Moreover, the impact of sampling current versus older foliage is rarely acknowledged in published literature, even though it may influence the interpretation of results. We compared the photosynthesis rate of current and 1-year-old foliage of black spruce natural regeneration during three growing seasons. The photosynthesis rate was consistently greater for 1-year-old needles compared to current-year needles at the beginning of each growing season; however, after about 1 month, rates were similar between the two age classes. This same pattern was repeated every season and was independent of light availability induced by different harvesting treatments. We suggest that photosynthesis measurements of black spruce should be performed on 1-year-old needles instead of current-year foliage to ensure more uniform photosynthesis values throughout the season.<\/p>\n","protected":false},"excerpt":{"rendered":"

Published in Communications in Soil Science and Plant Analysis 42: 2738-2750 Black spruce (Picea mariana) trees have needles that persist for a number of years, and it is not clear which age class should be evaluated for photosynthesis to best understand physiological responses. Moreover, the impact of sampling current versus older foliage is rarely acknowledged […]<\/p>\n","protected":false},"template":"","format":"standard","cptt_secteur":[1179],"cptt_theme":[1180,1181,1182],"cptt_categ_publi":[1149],"cptt_auteurs_ministeriels":[1090],"class_list":["post-82262","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-hebert-francois-en"],"acf":[],"yoast_head":"\nField photosynthesis measurements on black spruce (Picea mariana): Does needle age matter? - Minist\u00e8re des Ressources naturelles et des For\u00eats<\/title>\n<meta name=\"description\" content=\"Study : it is not clear which age class of black spruce needles should be evaluated for photosynthesis to understand physiological responses.\" \/>\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\/field-photosynthesis-measurements-black-spruce\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Field photosynthesis measurements on black spruce (Picea mariana): Does needle age matter? 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