WarrenPappasHelbigEtAl2018

Référence

Warren, R.K., Pappas, C., Helbig, M., Chasmer, L.E., Berg, A.A., Baltzer, J.L., Quinton, W.L., Sonnentag, O. (2018) Minor contribution of overstorey transpiration to landscape evapotranspiration in boreal permafrost peatlands. Ecohydrology. (Scopus )

Résumé

Evapotranspiration (ET) is a key component of the water cycle, whereby accurate partitioning of ET into evaporation and transpiration provides important information about the intrinsically coupled carbon, water, and energy fluxes. Currently, global estimates of partitioned evaporative and transpiration fluxes remain highly uncertain, especially for high-latitude ecosystems where measurements are scarce. Forested peat plateaus underlain by permafrost and surrounded by permafrost-free wetlands characterize approximately 60% (7.0 × 107 km2) of Canadian peatlands. In this study, 22 Picea mariana (black spruce) individuals, the most common tree species of the North American boreal forest, were instrumented with sap flow sensors within the footprint of an eddy covariance tower measuring ET from a forest-wetland mosaic landscape. Sap flux density (JS), together with remote sensing data and in situ measurements of canopy structure, was used to upscale tree-level JS to overstorey transpiration (TBS). Black spruce trees growing in nutrient-poor permafrost peat soils were found to have lower mean JS than those growing in mineral soils. Overall, TBS contributed less than 1% to landscape ET. Climate-change-induced forest loss and the expansion of wetlands may further minimize the contributions of TBS to ET and increase the contribution of standing water. © 2018 John Wiley & Sons, Ltd.

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@ARTICLE { WarrenPappasHelbigEtAl2018,
    AUTHOR = { Warren, R.K. and Pappas, C. and Helbig, M. and Chasmer, L.E. and Berg, A.A. and Baltzer, J.L. and Quinton, W.L. and Sonnentag, O. },
    TITLE = { Minor contribution of overstorey transpiration to landscape evapotranspiration in boreal permafrost peatlands },
    JOURNAL = { Ecohydrology },
    YEAR = { 2018 },
    NOTE = { cited By 0; Article in Press },
    ABSTRACT = { Evapotranspiration (ET) is a key component of the water cycle, whereby accurate partitioning of ET into evaporation and transpiration provides important information about the intrinsically coupled carbon, water, and energy fluxes. Currently, global estimates of partitioned evaporative and transpiration fluxes remain highly uncertain, especially for high-latitude ecosystems where measurements are scarce. Forested peat plateaus underlain by permafrost and surrounded by permafrost-free wetlands characterize approximately 60% (7.0 × 107 km2) of Canadian peatlands. In this study, 22 Picea mariana (black spruce) individuals, the most common tree species of the North American boreal forest, were instrumented with sap flow sensors within the footprint of an eddy covariance tower measuring ET from a forest-wetland mosaic landscape. Sap flux density (JS), together with remote sensing data and in situ measurements of canopy structure, was used to upscale tree-level JS to overstorey transpiration (TBS). Black spruce trees growing in nutrient-poor permafrost peat soils were found to have lower mean JS than those growing in mineral soils. Overall, TBS contributed less than 1% to landscape ET. Climate-change-induced forest loss and the expansion of wetlands may further minimize the contributions of TBS to ET and increase the contribution of standing water. © 2018 John Wiley & Sons, Ltd. },
    AFFILIATION = { Département de géographie and Centre d'études nordiques Université de Montréal 520 Chemin de la Côte Sainte-Catherine Montréal H2V 2B8QC Canada; Department of Geography University of Guelph 50 Stone Road East Guelph N1G 2W1ON Canada; Department of Geography University of Lethbridge 4401 University Drive Lethbridge T1K 3M4Alberta Canada; Department of Biology Wilfrid Laurier University 75 University Avenue West Waterloo N2L 3C5ON Canada; Cold Regions Research Centre Wilfrid Laurier University 75 University Avenue West Waterloo N2L 3C5ON Canada },
    AUTHOR_KEYWORDS = { Boreal forest; Eddy covariance; Evapotranspiration; Peatlands; Permafrost; Sap flow; Wetlands },
    DOCUMENT_TYPE = { Article in Press },
    DOI = { 10.1002/eco.1975 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85045195021&doi=10.1002%2feco.1975&partnerID=40&md5=384540c6e0dcf05628fbc48a26e43e37 },
}

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