WangCiaisPiaoEtAl2011

Reference

Wang, T., Ciais, P., Piao, S.L., Ottle, C., Brender, P., Maignan, F., Arain, A., Cescatti, A., Gianelle, D., Gough, C., Gu, L., Lafleur, P., Laurila, T., Marcolla, B., Margolis, H.A., Montagnani, L., Moors, E., Saigusa, N., Vesala, T., Wohlfahrt, G., Koven, C., Black, A., Dellwik, E., Don, A., Hollinger, D., Knohl, A., Monson, R., Munger, J., Suyker, A., Varlagin, A. and Verma, S. (2011) Controls on winter ecosystem respiration in temperate and boreal ecosystems. Biogeosciences, 8(7):2009-2025. (Scopus )

Abstract

Winter CO2 fluxes represent an important component of the annual carbon budget in northern ecosystems. Understanding winter respiration processes and their responses to climate change is also central to our ability to assess terrestrial carbon cycle and climate feedbacks in the future. However, the factors influencing the spatial and temporal patterns of winter ecosystem respiration (Reco) of northern ecosystems are poorly understood. For this reason, we analyzed eddy covariance flux data from 57 ecosystem sites ranging from ~35° N to ~70° N. Deciduous forests were characterized by the highest winter Reco rates (0.90 ± 0.39 g C m-2 d-1), when winter is defined as the period during which daily air temperature remains below 0 °C. By contrast, arctic wetlands had the lowest winter Reco rates (0.02 ± 0.02 g C m -2 d-1). Mixed forests, evergreen needle-leaved forests, grasslands, croplands and boreal wetlands were characterized by intermediate winter Reco rates (g C m-2 d-1) of 0.70(±0.33), 0.60(±0.38), 0.62(±0.43), 0.49(±0.22) and 0.27(±0.08), respectively. Our cross site analysis showed that winter air (Tair) and soil (Tsoil) temperature played a dominating role in determining the spatial patterns of winter Reco in both forest and managed ecosystems (grasslands and croplands). Besides temperature, the seasonal amplitude of the leaf area index (LAI), inferred from satellite observation, or growing season gross primary productivity, which we use here as a proxy for the amount of recent carbon available for R eco in the subsequent winter, played a marginal role in winter CO2 emissions from forest ecosystems. We found that winter R eco sensitivity to temperature variation across space (QS) was higher than the one over time (interannual, QT). This can be expected because QS not only accounts for climate gradients across sites but also for (positively correlated) the spatial variability of substrate quantity. Thus, if the models estimate future warming impacts on Reco based on QS rather than QT, this could overestimate the impact of temperature changes. © Author(s) 2011.

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@ARTICLE { WangCiaisPiaoEtAl2011,
    AUTHOR = { Wang, T. and Ciais, P. and Piao, S.L. and Ottle, C. and Brender, P. and Maignan, F. and Arain, A. and Cescatti, A. and Gianelle, D. and Gough, C. and Gu, L. and Lafleur, P. and Laurila, T. and Marcolla, B. and Margolis, H.A. and Montagnani, L. and Moors, E. and Saigusa, N. and Vesala, T. and Wohlfahrt, G. and Koven, C. and Black, A. and Dellwik, E. and Don, A. and Hollinger, D. and Knohl, A. and Monson, R. and Munger, J. and Suyker, A. and Varlagin, A. and Verma, S. },
    TITLE = { Controls on winter ecosystem respiration in temperate and boreal ecosystems },
    JOURNAL = { Biogeosciences },
    YEAR = { 2011 },
    VOLUME = { 8 },
    PAGES = { 2009--2025 },
    NUMBER = { 7 },
    ABSTRACT = { Winter CO2 fluxes represent an important component of the annual carbon budget in northern ecosystems. Understanding winter respiration processes and their responses to climate change is also central to our ability to assess terrestrial carbon cycle and climate feedbacks in the future. However, the factors influencing the spatial and temporal patterns of winter ecosystem respiration (Reco) of northern ecosystems are poorly understood. For this reason, we analyzed eddy covariance flux data from 57 ecosystem sites ranging from ~35° N to ~70° N. Deciduous forests were characterized by the highest winter Reco rates (0.90 ± 0.39 g C m-2 d-1), when winter is defined as the period during which daily air temperature remains below 0 °C. By contrast, arctic wetlands had the lowest winter Reco rates (0.02 ± 0.02 g C m -2 d-1). Mixed forests, evergreen needle-leaved forests, grasslands, croplands and boreal wetlands were characterized by intermediate winter Reco rates (g C m-2 d-1) of 0.70(±0.33), 0.60(±0.38), 0.62(±0.43), 0.49(±0.22) and 0.27(±0.08), respectively. Our cross site analysis showed that winter air (Tair) and soil (Tsoil) temperature played a dominating role in determining the spatial patterns of winter Reco in both forest and managed ecosystems (grasslands and croplands). Besides temperature, the seasonal amplitude of the leaf area index (LAI), inferred from satellite observation, or growing season gross primary productivity, which we use here as a proxy for the amount of recent carbon available for R eco in the subsequent winter, played a marginal role in winter CO2 emissions from forest ecosystems. We found that winter R eco sensitivity to temperature variation across space (QS) was higher than the one over time (interannual, QT). This can be expected because QS not only accounts for climate gradients across sites but also for (positively correlated) the spatial variability of substrate quantity. Thus, if the models estimate future warming impacts on Reco based on QS rather than QT, this could overestimate the impact of temperature changes. © Author(s) 2011. },
    COMMENT = { Export Date: 29 August 2011 Source: Scopus doi: 10.5194/bg-8-2009-2011 },
    ISSN = { 17264170 (ISSN) },
    OWNER = { Luc },
    TIMESTAMP = { 2011.08.29 },
    URL = { http://www.scopus.com/inward/record.url?eid=2-s2.0-79960767036&partnerID=40&md5=2d4d4476d2c112fe0401b71adb59824f },
}

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