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Soil CO2 efflux and production rates as influenced by evapotranspiration in a dry grassland

Balogh, János ; Fóti, Szilvia ; Pintér, Krisztina ; Burri, Susanne ; Eugster, Werner ; Papp, Marianna ; Nagy, Zoltán

In: Plant and Soil, 2015, vol. 388, no. 1-2, p. 157-173

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    Titre
    • Soil CO2 efflux and production rates as influenced by evapotranspiration in a dry grassland
    Auteur
    • Balogh, János. Institute of Botany and Ecophysiology, Szent István University, Páter u. 1, 2100, Gödöllő, Hungary
    • Fóti, Szilvia. MTA-SZIE Plant Ecology Research Group, Szent István University, Páter u. 1, 2100, Gödöllő, Hungary
    • Pintér, Krisztina. Institute of Botany and Ecophysiology, Szent István University, Páter u. 1, 2100, Gödöllő, Hungary
    • Burri, Susanne. Grassland Sciences Group, Institute of Agricultural Sciences, ETH Zurich, Universitätsstrasse 2, 8092, Zürich, Switzerland
    • Eugster, Werner. Grassland Sciences Group, Institute of Agricultural Sciences, ETH Zurich, Universitätsstrasse 2, 8092, Zürich, Switzerland
    • Papp, Marianna. MTA-SZIE Plant Ecology Research Group, Szent István University, Páter u. 1, 2100, Gödöllő, Hungary
    • Nagy, Zoltán. Institute of Botany and Ecophysiology, Szent István University, Páter u. 1, 2100, Gödöllő, Hungary
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Plant and Soil, 2015, vol. 388, no. 1-2, p. 157-173. Springer International Publishing
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:331195
    Summary
    Aims: Our aim was to study the effect of potential biotic drivers, including evapotranspiration (ET) and gross primary production (GPP), on the soil CO2 production and efflux on the diel time scale. Methods: Eddy covariance, soil respiration and soil CO2 gradient systems were used to measure the CO2 and H2O fluxes in a dry, sandy grassland in Hungary. The contribution of CO2 production from three soil layers to plot-scale soil respiration was quantified. CO2 production and efflux residuals after subtracting the effects of the main abiotic and biotic drivers were analysed. Results: Soil CO2 production showed a strong negative correlation with ET rates with a time lag of 0.5h in the two upper layers, whereas less strong, but still significant time-lagged and positive correlations were found between GPP and soil CO2 production. Our results suggest a rapid negative response of soil CO2 production rates to transpiration changes, and a delayed positive response to GPP. Conclusions: We found evidence for a combined effect of soil temperature and transpiration that influenced the diel changes in soil CO2 production. A possible explanation for this pattern could be that a significant part of CO2 produced in the soil may be transported across soil layers via the xylem.