{"id":81964,"date":"2020-07-16T10:44:28","date_gmt":"2020-07-16T14:44:28","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/whole-plant-cuvette-system-measure-responses-conifer-seedlings-environmental-change\/"},"modified":"2020-07-16T10:44:28","modified_gmt":"2020-07-16T14:44:28","slug":"whole-plant-cuvette-system-measure-responses-conifer-seedlings-environmental-change","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/whole-plant-cuvette-system-measure-responses-conifer-seedlings-environmental-change\/","title":{"rendered":"A whole-plant cuvette system to measure short-term responses of conifer seedlings to environmental change"},"content":{"rendered":"\n<p>Published in <strong>Tree Physiology 14: 759-768<\/strong><\/p>\n<p>A computer-controlled whole-plant cuvette system is described that allows precise and independent control of temperature (\u00b1 0.05 \u00b0C), vapor pressure (\u00b1 0.02 kPa), CO<sub>2<\/sub> concentration (\u00b1 2 mmol mol<sup>-1<\/sup>) and photosynthetic photon flux density (\u00b1 5 mmol m<sup>-2<\/sup> s<sup>-1<\/sup>), and allows the continuous measurement of net photosynthesis and transpiration rates. Vapor pressure is controlled by circulating chamber air through a CaSO<sub>4<\/sub> desiccant column supported on a digital balance. Transpiration rate is calculated from the change in desiccant mass with time. Photosynthesis rate is measured by integrating the output of a mass flow controller used to inject CO<sub>2<\/sub> into the chamber to compensate for that assimilated by the plant.<\/p>\n<p>The control system can be driven by set points that can be varied, for example, as a function of time, or held constant. We were able to simulate weather data obtained from climate stations and accurately follow, in real time, the output of sensors measuring outside conditions.<\/p>\n<p>Experiments on well-watered one- and two-year-old nursery-raised western red cedar (<em>Thuja plicata<\/em> Donn.) and white spruce (<em>Picea glauca<\/em> (Moench) Voss) seedlings showed that if the mean daily temperature was increased from 20 to 22 \u00b0C with vapor pressure remaining constant at 1 kPa, CO<sub>2<\/sub> concentrations must almost double to compensate for the decrease in net photosynthesis rate.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Published in Tree Physiology 14: 759-768 A computer-controlled whole-plant cuvette system is described that allows precise and independent control of temperature (\u00b1 0.05 \u00b0C), vapor pressure (\u00b1 0.02 kPa), CO2 concentration (\u00b1 2 mmol mol-1) and photosynthetic photon flux density (\u00b1 5 mmol m-2 s-1), and allows the continuous measurement of net photosynthesis and transpiration [&hellip;]<\/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-81964","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":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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