BahnRodeghieroAnderson-DunnEtAl2008

Référence

Bahn, M., Rodeghiero, M., Anderson-Dunn, M., Dore, S., Gimeno, C., Drosler, M., Williams, M., Ammann, C., Berninger, F., Flechard, C., Jones, S., Balzarolo, M., Kumar, S., Newesely, C., Priwitzer, T., Raschi, A., Siegwolf, R., Susiluoto, S., Tenhunen, J., Wohlfahrt, G. and Cernusca, A. (2008) Soil Respiration in European Grasslands in Relation to Climate and Assimilate Supply. Ecosystems, 11(8):1352-1367.

Résumé

Soil respiration constitutes the second largest flux of carbon (C) between terrestrial ecosystems and the atmosphere. This study provides a synthesis of soil respiration (R-s) in 20 European grasslands across a climatic transect, including ten meadows, eight pastures and two unmanaged grasslands. Maximum rates of R-s (R-smax), R-s at a reference soil temperature (10 degrees C; R-s10) and annual R-s (estimated for 13 sites) ranged from 1.9 to 15.9 mu mol CO2 m(-2) s(-1), 0.3 to 5.5 mu mol CO2 m(-2) s(-1) and 58 to 1988 g C m(-2) y(-1), respectively. Values obtained for Central European mountain meadows are amongst the highest so far reported for any type of ecosystem. Across all sites Rsmax was closely related to R-s10.Assimilate supply affected R-s at timescales from daily (but not necessarily diurnal) to annual. Reductions of assimilate supply by removal of aboveground biomass through grazing and cutting resulted in a rapid and a significant decrease of R-s. Temperature-independent seasonal fluctuations of Rs of an intensively managed pasture were closely related to changes in leaf area index (LAI). Across sites R-s10 increased with mean annual soil temperature (MAT), LAI and gross primary productivity (GPP), indicating that assimilate supply overrides potential acclimation to prevailing temperatures. Also annual R-s was closely related to LAI and GPP. Because the latter two parameters were coupled to MAT, temperature was a suitable surrogate for deriving estimates of annual R-s across the grasslands studied. These findings contribute to our understanding of regional patterns of soil C fluxes and highlight the importance of assimilate supply for soil CO2 emissions at various timescales.

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@ARTICLE { BahnRodeghieroAnderson-DunnEtAl2008,
    AUTHOR = { Bahn, M. and Rodeghiero, M. and Anderson-Dunn, M. and Dore, S. and Gimeno, C. and Drosler, M. and Williams, M. and Ammann, C. and Berninger, F. and Flechard, C. and Jones, S. and Balzarolo, M. and Kumar, S. and Newesely, C. and Priwitzer, T. and Raschi, A. and Siegwolf, R. and Susiluoto, S. and Tenhunen, J. and Wohlfahrt, G. and Cernusca, A. },
    TITLE = { Soil Respiration in European Grasslands in Relation to Climate and Assimilate Supply },
    JOURNAL = { Ecosystems },
    YEAR = { 2008 },
    VOLUME = { 11 },
    PAGES = { 1352-1367 },
    NUMBER = { 8 },
    MONTH = { dec },
    ABSTRACT = { Soil respiration constitutes the second largest flux of carbon (C) between terrestrial ecosystems and the atmosphere. This study provides a synthesis of soil respiration (R-s) in 20 European grasslands across a climatic transect, including ten meadows, eight pastures and two unmanaged grasslands. Maximum rates of R-s (R-smax), R-s at a reference soil temperature (10 degrees C; R-s10) and annual R-s (estimated for 13 sites) ranged from 1.9 to 15.9 mu mol CO2 m(-2) s(-1), 0.3 to 5.5 mu mol CO2 m(-2) s(-1) and 58 to 1988 g C m(-2) y(-1), respectively. Values obtained for Central European mountain meadows are amongst the highest so far reported for any type of ecosystem. Across all sites Rsmax was closely related to R-s10.Assimilate supply affected R-s at timescales from daily (but not necessarily diurnal) to annual. Reductions of assimilate supply by removal of aboveground biomass through grazing and cutting resulted in a rapid and a significant decrease of R-s. Temperature-independent seasonal fluctuations of Rs of an intensively managed pasture were closely related to changes in leaf area index (LAI). Across sites R-s10 increased with mean annual soil temperature (MAT), LAI and gross primary productivity (GPP), indicating that assimilate supply overrides potential acclimation to prevailing temperatures. Also annual R-s was closely related to LAI and GPP. Because the latter two parameters were coupled to MAT, temperature was a suitable surrogate for deriving estimates of annual R-s across the grasslands studied. These findings contribute to our understanding of regional patterns of soil C fluxes and highlight the importance of assimilate supply for soil CO2 emissions at various timescales. },
    AF = { Bahn, MichaelRodeghiero, Mirco Anderson-Dunn, Margaret Dore, Sabina Gimeno, Cristina Droesler, Matthias Williams, Michael Ammann, Christof Berninger, Frank Flechard, Chris Jones, Stephanie Balzarolo, Manuela Kumar, Suresh Newesely, Christian Priwitzer, Tibor Raschi, Antonio Siegwolf, Rolf Susiluoto, Sanna Tenhunen, John Wohlfahrt, Georg Cernusca, Alexander },
    DE = { soil CO2 efflux; temperature; moisture; gross primary productivity; leaf area index; soil carbon; land use },
    DI = { 10.1007/s10021-008-9198-0 },
    KEYWORDS = { EDDY COVARIANCE DATA; ECOSYSTEM RESPIRATION; CARBON-DIOXIDE; CO2 FLUX; INTERANNUAL VARIABILITY; TEMPERATURE SENSITIVITY; CHAMBER MEASUREMENTS; TREE PHOTOSYNTHESIS; TALLGRASS PRAIRIE; ROOT RESPIRATION },
    OWNER = { brugerolles },
    PG = { 16 },
    SN = { 1432-9840 },
    TIMESTAMP = { 2008.12.19 },
    UT = { ISI:000260951100011 },
}

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