WohlfahrtAnderson-DunnBahnEtAl2008

Référence

Wohlfahrt, G., Anderson-Dunn, M., Bahn, M., Balzarolo, M., Berninger, F., Campbell, C., Carrara, A., Cescatti, A., Christensen, T., Dore, S., Eugster, W., Friborg, T., Furger, M., Gianelle, D., Gimeno, C., Hargreaves, K., Hari, P., Haslwanter, A., Johansson, T., Marcolla, B., Milford, C., Nagy, Z., Nemitz, E., Rogiers, N., Sanz, M.J., Siegwolf, R.T.W., Susiluoto, S., Sutton, M., Tuba, Z., Ugolini, F., Valentini, R., Zorer, R., Cernusca, A. (2008) Biotic, Abiotic, and Management Controls on the Net Ecosystem CO2 Exchange of European Mountain Grassland Ecosystems. Ecosystems, 11(8):1338-1351.

Résumé

was spring and autumn for the sites characterized by summer droughts (southern sites) and (peak) summer for the Alpine and northern study sites. This general pattern was interrupted by grassland management practices, that is, mowing and grazing, when the variability in NEE explained by PPFD decreased in concert with the amount of aboveground biomass (BMag). Temperature was the abiotic influence factor that explained most of the variability in ecosystem respiration at the Alpine and northern study sites, but not at the southern sites characterized by a pronouncedThe net ecosystem carbon dioxide (CO2) exchange (NEE) of nine European mountain grassland ecosystems was measured during 2002-2004 using the eddy covariance method. Overall, the availability of photosynthetically active radiation (PPFD) was the single most important abiotic influence factor for NEE. Its role changed markedly during the course of the season, PPFD being a better predictor for NEE during periods favorable for CO2 uptake, which summer drought, where soil water availability and the amount of aboveground biomass were more or equally important. The amount of assimilating plant area was the single most important biotic variable determining the maximum ecosystem carbon uptake potential, that is, the NEE at saturating PPFD. Good correspondence, in terms of the magnitude of NEE, was observed with many (semi-) natural grasslands around the world, but not with grasslands sown on fertile soils in lowland locations, which exhibited higher maximum carbon gains at lower respiratory costs. It is concluded that, through triggering rapid changes in the amount and area of the aboveground plant matter, the timing and frequency of land management practices is crucial for the short-term sensitivity of the NEE of the investigated mountain grassland ecosystems to climatic drivers.

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@ARTICLE { WohlfahrtAnderson-DunnBahnEtAl2008,
    AUTHOR = { Wohlfahrt, G. and Anderson-Dunn, M. and Bahn, M. and Balzarolo, M. and Berninger, F. and Campbell, C. and Carrara, A. and Cescatti, A. and Christensen, T. and Dore, S. and Eugster, W. and Friborg, T. and Furger, M. and Gianelle, D. and Gimeno, C. and Hargreaves, K. and Hari, P. and Haslwanter, A. and Johansson, T. and Marcolla, B. and Milford, C. and Nagy, Z. and Nemitz, E. and Rogiers, N. and Sanz, M.J. and Siegwolf, R.T.W. and Susiluoto, S. and Sutton, M. and Tuba, Z. and Ugolini, F. and Valentini, R. and Zorer, R. and Cernusca, A. },
    TITLE = { Biotic, Abiotic, and Management Controls on the Net Ecosystem CO2 Exchange of European Mountain Grassland Ecosystems },
    JOURNAL = { Ecosystems },
    YEAR = { 2008 },
    VOLUME = { 11 },
    PAGES = { 1338-1351 },
    NUMBER = { 8 },
    MONTH = { dec },
    ABSTRACT = { was spring and autumn for the sites characterized by summer droughts (southern sites) and (peak) summer for the Alpine and northern study sites. This general pattern was interrupted by grassland management practices, that is, mowing and grazing, when the variability in NEE explained by PPFD decreased in concert with the amount of aboveground biomass (BMag). Temperature was the abiotic influence factor that explained most of the variability in ecosystem respiration at the Alpine and northern study sites, but not at the southern sites characterized by a pronouncedThe net ecosystem carbon dioxide (CO2) exchange (NEE) of nine European mountain grassland ecosystems was measured during 2002-2004 using the eddy covariance method. Overall, the availability of photosynthetically active radiation (PPFD) was the single most important abiotic influence factor for NEE. Its role changed markedly during the course of the season, PPFD being a better predictor for NEE during periods favorable for CO2 uptake, which summer drought, where soil water availability and the amount of aboveground biomass were more or equally important. The amount of assimilating plant area was the single most important biotic variable determining the maximum ecosystem carbon uptake potential, that is, the NEE at saturating PPFD. Good correspondence, in terms of the magnitude of NEE, was observed with many (semi-) natural grasslands around the world, but not with grasslands sown on fertile soils in lowland locations, which exhibited higher maximum carbon gains at lower respiratory costs. It is concluded that, through triggering rapid changes in the amount and area of the aboveground plant matter, the timing and frequency of land management practices is crucial for the short-term sensitivity of the NEE of the investigated mountain grassland ecosystems to climatic drivers. },
    AF = { Wohlfahrt, Georg Anderson-Dunn, Margaret Bahn, Michael Balzarolo, Manuela Berninger, Frank Campbell, ClaireEOLEOLCarrara, Arnaud Cescatti, Alessandro Christensen, Torben Dore, Sabina Eugster, Werner Friborg, Thomas Furger, Markus Gianelle, Damiano Gimeno, Cristina Hargreaves, Ken Hari, Pertti Haslwanter, Alois Johansson, Torbjorn Marcolla, Barbara Milford, Celia Nagy, Zoltan Nemitz, Eiko Rogiers, Nele Sanz, Maria J. Siegwolf, Rolf T. W. Susiluoto, Sanna Sutton, Mark Tuba, Zoltan Ugolini, Francesca Valentini, Riccardo Zorer, Roberto Cernusca, Alexander },
    DE = { biomass; Carbomont; ecosystem respiration; eddy covariance; green areaEOLEOLindex; grazing; light response; mowing },
    DI = { 10.1007/s10021-008-9196-2 },
    KEYWORDS = { CARBON-DIOXIDE EXCHANGE; GROSS PRIMARY PRODUCTION; NORTHERN TEMPERATE GRASSLAND; WATER-VAPOR EXCHANGE; SOIL RESPIRATION; EDDY COVARIANCE; LAND-USE; SPATIAL VARIABILITY; SEASONAL-VARIATION; TUNDRA ECOSYSTEMS },
    OWNER = { brugerolles },
    PG = { 14 },
    SN = { 1432-9840 },
    TIMESTAMP = { 2008.12.19 },
    UT = { ISI:000260951100009 },
}

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