PappasMathenyBaltzerEtAl2018

Référence

Pappas, C., Matheny, A.M., Baltzer, J.L., Barr, A.G., Black, T.A., Bohrer, G., Detto, M., Maillet, J., Roy, A., Sonnentag, O., Stephens, J. (2018) Boreal tree hydrodynamics: Asynchronous, diverging, yet complementary. Tree Physiology, 38(7):953-964. (Scopus )

Résumé

Water stress has been identified as a key mechanism of the contemporary increase in tree mortality rates in northwestern North America. However, a detailed analysis of boreal tree hydrodynamics and their interspecific differences is still lacking. Here we examine the hydraulic behaviour of co-occurring larch (Larix laricina) and black spruce (Picea mariana), two characteristic boreal tree species, near the southern limit of the boreal ecozone in central Canada. Sap flux density (Js), concurrently recorded stem radius fluctuations and meteorological conditions are used to quantify tree hydraulic functioning and to scrutinize tree water-use strategies. Our analysis revealed asynchrony in the diel hydrodynamics of the two species with the initial rise in Js occurring 2 h earlier in larch than in black spruce. Interspecific differences in larch and black spruce crown architecture explained the observed asynchrony in their hydraulic functioning. Furthermore, the two species exhibited diverging stomatal regulation strategies with larch and black spruce employing relatively isohydric and anisohydric behaviour, respectively. Such asynchronous and diverging tree-level hydrodynamics provide new insights into the ecosystem-level complementarity in tree form and function, with implications for understanding boreal forests' water and carbon dynamics and their resilience to environmental stress. © The Author(s) 2018. Published by Oxford University Press. All rights reserved.

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@ARTICLE { PappasMathenyBaltzerEtAl2018,
    AUTHOR = { Pappas, C. and Matheny, A.M. and Baltzer, J.L. and Barr, A.G. and Black, T.A. and Bohrer, G. and Detto, M. and Maillet, J. and Roy, A. and Sonnentag, O. and Stephens, J. },
    TITLE = { Boreal tree hydrodynamics: Asynchronous, diverging, yet complementary },
    JOURNAL = { Tree Physiology },
    YEAR = { 2018 },
    VOLUME = { 38 },
    NUMBER = { 7 },
    PAGES = { 953-964 },
    NOTE = { cited By 3 },
    ABSTRACT = { Water stress has been identified as a key mechanism of the contemporary increase in tree mortality rates in northwestern North America. However, a detailed analysis of boreal tree hydrodynamics and their interspecific differences is still lacking. Here we examine the hydraulic behaviour of co-occurring larch (Larix laricina) and black spruce (Picea mariana), two characteristic boreal tree species, near the southern limit of the boreal ecozone in central Canada. Sap flux density (Js), concurrently recorded stem radius fluctuations and meteorological conditions are used to quantify tree hydraulic functioning and to scrutinize tree water-use strategies. Our analysis revealed asynchrony in the diel hydrodynamics of the two species with the initial rise in Js occurring 2 h earlier in larch than in black spruce. Interspecific differences in larch and black spruce crown architecture explained the observed asynchrony in their hydraulic functioning. Furthermore, the two species exhibited diverging stomatal regulation strategies with larch and black spruce employing relatively isohydric and anisohydric behaviour, respectively. Such asynchronous and diverging tree-level hydrodynamics provide new insights into the ecosystem-level complementarity in tree form and function, with implications for understanding boreal forests' water and carbon dynamics and their resilience to environmental stress. © The Author(s) 2018. Published by Oxford University Press. All rights reserved. },
    AFFILIATION = { Département de Géographie, Centre d'Études Nordiques, Université de Montréal, Montréal, QC H2V 2B8, Canada; Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78712, United States; Department of Civil, Environmental, and Geodetic Engineering, Ohio State University, Columbus, OH 43210, United States; Department of Biology, Wilfrid Laurier University, Waterloo, ON N2L 3C5, Canada; Climate Research Division, Environment Canada and Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada; Faculty of Land and Food Systems, Biometeorology and Soil Physics Group, University of British Columbia, Vancouver, BC V6T 1Z4, Canada; Center for Tropical Forest Science-Forest Global Earth Observatory, Smithsonian Tropical Research Institute, Panamà, 0843-03092, Panama; Department of Ecology and Evolutionary Biology, Princeton University, Princeton, NJ 08544, United States; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK S7N 5C8, Canada },
    AUTHOR_KEYWORDS = { Boreal forest; Crown complementarity; Dendrometers; Isohydricity; Larix laricina (larch; Picea mariana (black spruce); Plant hydraulics; Sap flow; Tamarack) },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1093/treephys/tpy043 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85049976631&doi=10.1093%2ftreephys%2ftpy043&partnerID=40&md5=19a6ec4ae24298c04f2c6d9d982be9db },
}

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