{"id":82445,"date":"2019-01-30T12:11:49","date_gmt":"2019-01-30T17:11:49","guid":{"rendered":"https:\/\/mrnf.gouv.qc.ca\/nos-publications\/leaf-plant-level-carbon-gain-yellow-birch-sugar-maple-beech-seedlings-forest-light\/"},"modified":"2019-01-30T12:11:49","modified_gmt":"2019-01-30T17:11:49","slug":"leaf-plant-level-carbon-gain-yellow-birch-sugar-maple-beech-seedlings-forest-light","status":"publish","type":"cpt_publication","link":"https:\/\/mrnf.gouv.qc.ca\/en\/our-publications\/leaf-plant-level-carbon-gain-yellow-birch-sugar-maple-beech-seedlings-forest-light\/","title":{"rendered":"Leaf- and plant-level carbon gain in yellow birch, sugar maple, and beech seedlings from contrasting forest light environments"},"content":{"rendered":"\n<p>Published in <strong>Canadian Journal of Forest Research 30: 390-404<\/strong><\/p> <p>Leaf-level photosynthetic-light response and plant-level daily carbon gain were estimated for seedlings of moderately shade-tolerant yellow birch (<em>Betula alleghaniensis<\/em> Britton) and shade-tolerant sugar maple (<em>Acer saccharum<\/em> Marsh.) and beech (<em>Fagus grandifolia <\/em>Ehrh.) growing in gaps and under a closed canopy in a sugar maple stand at Duchesnay, Que. All three species had a higher photosynthetic capacity (<em>A<\/em><sub>max<\/sub>) in the gaps than in shade, but yellow birch and beech responded more markedly than sugar maple to the increase in light availability. The high degree of plasticity observed in beech suggests that the prediction that photosynthetic plasticity should decrease with increasing shade tolerance may not hold when comparisons are made among a few late-successional species. Unit-area daily carbon gain (<em>C<\/em><sub>A<\/sub>) was significantly higher in the gaps than in shade for all three species, but no significant difference was observed between light environments for plant-level carbon gain (<em>C<\/em><sub>W<\/sub>). In shade, we found no difference of <em>C<\/em><sub>A<\/sub> and <em>C<\/em><sub>W<\/sub> among species. In gaps, beech had a significantly higher <em>C<\/em><sub>A<\/sub> than sugar maple but similar to that of birch, and birch had a significantly higher <em>C<\/em><sub>W<\/sub> than maple but similar to that of beech. Sugar maple consistently had lower carbon gains than yellow birch and beech but is nevertheless the dominant species at our study site. These results indicate that although plant-level carbon gain is presumably more closely related to growth and survival of a species than leaf-level photosynthesis, it is still many steps removed from the ecological success of a species.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Published in Canadian Journal of Forest Research 30: 390-404 Leaf-level photosynthetic-light response and plant-level daily carbon gain were estimated for seedlings of moderately shade-tolerant yellow birch (Betula alleghaniensis Britton) and shade-tolerant sugar maple (Acer saccharum Marsh.) and beech (Fagus grandifolia Ehrh.) growing in gaps and under a closed canopy in a sugar maple stand at [&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-82445","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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