PappasMailletRakowskiEtAl2020

Référence

Pappas, C., Maillet, J., Rakowski, S., Baltzer, J.L., Barr, A.G., Black, T.A., Fatichi, S., Laroque, C.P., Matheny, A.M., Roy, A., Sonnentag, O., Zha, T. (2020) Aboveground tree growth is a minor and decoupled fraction of boreal forest carbon input. Agricultural and Forest Meteorology, 290. (Scopus )

Résumé

The boreal biome accounts for approximately one third of the terrestrial carbon (C) sink. However, estimates of its individual C pools remain uncertain. Here, focusing on the southern boreal forest, we quantified the magnitude and temporal dynamics of C allocation to aboveground tree growth at a mature black spruce (Picea mariana)-dominated forest stand in Saskatchewan, Canada. We reconstructed aboveground tree biomass increments (AGBi) using a biometric approach, i.e., species-specific allometry combined with forest stand characteristics and tree ring widths collected with a C-oriented sampling design. We explored the links between boreal tree growth and ecosystem C input by comparing AGBi with eddy-covariance-derived ecosystem C fluxes from 1999 to 2015 and we synthesized our findings with a refined meta-analysis of published values of boreal forest C use efficiency (CUE). Mean AGBi at the study site was decoupled from ecosystem C input and equal to 71 ± 7 g C m–2 (1999–2015), which is only a minor fraction of gross ecosystem production (GEP; i.e., AGBi / GEP ≈ 9 %). Moreover, C allocation to AGBi remained stable over time (AGBi / GEP; –0.0001 yr–1; p-value=0.775), contrary to significant trends in GEP (+5.72 g C m–2 yr–2; p-value=0.02) and CUE (–0.0041 yr–1, p-value=0.007). CUE was estimated as 0.50 ± 0.03 at the study area and 0.41 ± 0.12 across the reviewed boreal forests. These findings highlight the importance of belowground tree C investments, together with the substantial contribution of understory, ground cover and soil to the boreal forest C balance. Our quantitative insights into the dynamics of aboveground boreal tree C allocation offer additional observational constraints for terrestrial ecosystem models that are often biased in converting C input to biomass, and can guide forest-management strategies for mitigating carbon dioxide emissions. © 2020 Elsevier B.V.

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@ARTICLE { PappasMailletRakowskiEtAl2020,
    AUTHOR = { Pappas, C. and Maillet, J. and Rakowski, S. and Baltzer, J.L. and Barr, A.G. and Black, T.A. and Fatichi, S. and Laroque, C.P. and Matheny, A.M. and Roy, A. and Sonnentag, O. and Zha, T. },
    JOURNAL = { Agricultural and Forest Meteorology },
    TITLE = { Aboveground tree growth is a minor and decoupled fraction of boreal forest carbon input },
    YEAR = { 2020 },
    NOTE = { cited By 0 },
    VOLUME = { 290 },
    ABSTRACT = { The boreal biome accounts for approximately one third of the terrestrial carbon (C) sink. However, estimates of its individual C pools remain uncertain. Here, focusing on the southern boreal forest, we quantified the magnitude and temporal dynamics of C allocation to aboveground tree growth at a mature black spruce (Picea mariana)-dominated forest stand in Saskatchewan, Canada. We reconstructed aboveground tree biomass increments (AGBi) using a biometric approach, i.e., species-specific allometry combined with forest stand characteristics and tree ring widths collected with a C-oriented sampling design. We explored the links between boreal tree growth and ecosystem C input by comparing AGBi with eddy-covariance-derived ecosystem C fluxes from 1999 to 2015 and we synthesized our findings with a refined meta-analysis of published values of boreal forest C use efficiency (CUE). Mean AGBi at the study site was decoupled from ecosystem C input and equal to 71 ± 7 g C m–2 (1999–2015), which is only a minor fraction of gross ecosystem production (GEP; i.e., AGBi / GEP ≈ 9 %). Moreover, C allocation to AGBi remained stable over time (AGBi / GEP; –0.0001 yr–1; p-value=0.775), contrary to significant trends in GEP (+5.72 g C m–2 yr–2; p-value=0.02) and CUE (–0.0041 yr–1, p-value=0.007). CUE was estimated as 0.50 ± 0.03 at the study area and 0.41 ± 0.12 across the reviewed boreal forests. These findings highlight the importance of belowground tree C investments, together with the substantial contribution of understory, ground cover and soil to the boreal forest C balance. Our quantitative insights into the dynamics of aboveground boreal tree C allocation offer additional observational constraints for terrestrial ecosystem models that are often biased in converting C input to biomass, and can guide forest-management strategies for mitigating carbon dioxide emissions. © 2020 Elsevier B.V. },
    AFFILIATION = { Département de géographie, Université de Montréal, Montréal, QC, Canada; School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK, Canada; Institute of Applied Geosciences, Karlsruhe Institute of Technology, Karlsruhe, Germany; Department of Biology, Wilfrid Laurier University, Waterloo, ON, Canada; Climate Research Division, Environment and Climate Change Canada and Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK, Canada; Faculty of Land and Food Systems, Biometeorology and Soil Physics Group, University of British Columbia, Vancouver, BC, Canada; Department of Civil and Environmental Engineering, National University of Singapore, Singapore; Institute of Environmental Engineering, ETH Zurich, Zurich, Switzerland; Department of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX, United States; Université du Québec à Trois-Rivières, Département des Sciences de l'Environnement, Trois-Rivières, QC, Canada; Yanchi Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing, China; Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, Beijing, China },
    ART_NUMBER = { 108030 },
    AUTHOR_KEYWORDS = { Carbon use efficiency (CUE); Forest inventories; Larix laricina (eastern larch, tamarack), Picea mariana (black spruce); Southern old black spruce (SOBS); Terrestrial carbon sink },
    DOCUMENT_TYPE = { Article },
    DOI = { 10.1016/j.agrformet.2020.108030 },
    SOURCE = { Scopus },
    URL = { https://www.scopus.com/inward/record.uri?eid=2-s2.0-85085652114&doi=10.1016%2fj.agrformet.2020.108030&partnerID=40&md5=5eef60e55a471d801f6fae454ff4fc4f },
}

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