Giguere-CroteauBoucherBergeronEtAl2019

Référence

Giguere-Croteau, C., Boucher, E., Bergeron, Y., Girardin, M.P., Drobyshev, I., Silva, L.C.R., Helie, J.-F., Garneau, M. (2019) North America’s oldest boreal trees are more efficient water users due to increased [CO 2 ], but do not grow faster. Proceedings of the National Academy of Sciences of the United States of America, 116(7):2749-2754. (Scopus )

Résumé

Due to anthropogenic emissions and changes in land use, trees are now exposed to atmospheric levels of [CO 2 ] that are unprecedented for 650,000 y [Lüthi et al. (2008) Nature 453:379–382] (thousands of tree generations). Trees are expected to acclimate by modulating leaf–gas exchanges and alter water use efficiency which may result in forest productivity changes. Here, we present evidence of one of the strongest, nonlinear, and unequivocal postindustrial increases in intrinsic water use efficiency (iWUE) ever documented (+59%). A dual-isotope tree-ring analysis (δ 13 C and δ 18 O) covering 715 y of growth of North America’s oldest boreal trees (Thuja occidentalis L.) revealed an unprecedented increase in iWUE that was directly linked to elevated assimilation rates of CO 2 (A). However, limited nutrient availability, changes in carbon allocation strategies, and changes in stomatal density may have offset stem growth benefits awarded by the increased iWUE. Our results demonstrate that even in scenarios where a positive CO 2 fertilization effect is observed, other mechanisms may prevent trees from assimilating and storing supplementary anthropogenic emissions as above-ground biomass. In such cases, the sink capacity of forests in response to changing atmospheric conditions might be overestimated. © National Academy of Sciences. All rights reserved.

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@ARTICLE { Giguere-CroteauBoucherBergeronEtAl2019,
    AUTHOR = { Giguere-Croteau, C. and Boucher, E. and Bergeron, Y. and Girardin, M.P. and Drobyshev, I. and Silva, L.C.R. and Helie, J.-F. and Garneau, M. },
    TITLE = { North America’s oldest boreal trees are more efficient water users due to increased [CO 2 ], but do not grow faster },
    JOURNAL = { Proceedings of the National Academy of Sciences of the United States of America },
    YEAR = { 2019 },
    VOLUME = { 116 },
    NUMBER = { 7 },
    PAGES = { 2749-2754 },
    NOTE = { cited By 0 },
    ABSTRACT = { Due to anthropogenic emissions and changes in land use, trees are now exposed to atmospheric levels of [CO 2 ] that are unprecedented for 650,000 y [Lüthi et al. (2008) Nature 453:379–382] (thousands of tree generations). Trees are expected to acclimate by modulating leaf–gas exchanges and alter water use efficiency which may result in forest productivity changes. Here, we present evidence of one of the strongest, nonlinear, and unequivocal postindustrial increases in intrinsic water use efficiency (iWUE) ever documented (+59%). A dual-isotope tree-ring analysis (δ 13 C and δ 18 O) covering 715 y of growth of North America’s oldest boreal trees (Thuja occidentalis L.) revealed an unprecedented increase in iWUE that was directly linked to elevated assimilation rates of CO 2 (A). However, limited nutrient availability, changes in carbon allocation strategies, and changes in stomatal density may have offset stem growth benefits awarded by the increased iWUE. Our results demonstrate that even in scenarios where a positive CO 2 fertilization effect is observed, other mechanisms may prevent trees from assimilating and storing supplementary anthropogenic emissions as above-ground biomass. In such cases, the sink capacity of forests in response to changing atmospheric conditions might be overestimated. © National Academy of Sciences. All rights reserved. },
    AFFILIATION = { Department of Biology, Université du Québec à Montréal, Montréal, QC H2X 1Y4, Canada; GEOTOP, Université du Québec à Montréal, Montréal, QC H2X 1Y4, Canada; Centre d’Études sur la Forêt, Université du Québec à Montréal, Montréal, QC H2X 1Y4, Canada; Department of Geography, Université du Québec à Montréal, Montréal, QC H2X 3R9, Canada; Centre d’Études Nordiques, Université Laval, Québec, QC G1V 0A6, Canada; Institut de Recherche sur les Forêts, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, QC J9X 5E4, Canada; Centre de Foresterie des Laurentides, Ressources Naturelles Canada, Sainte-Foy, QC G1V 4C7, Canada; Environmental Studies Program, Department of Geography, Institute of Ecology and Evolution, University of Oregon, Eugene, OR 97403, United States; Department of Earth and Atmosphere Sciences, Université du Québec à Montréal, Montréal, QC H2X 3Y7, Canada },
    AUTHOR_KEYWORDS = { Boreal forest; Carbon dioxide; Productivity; Stable isotopes; Water use efficiency },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1073/pnas.1816686116 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85061348671&doi=10.1073%2fpnas.1816686116&partnerID=40&md5=030904dfd9e68229c432d37261d4929d },
}

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