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Carbon balance assessment of a Belgian winter wheat crop (Triticum aestivum L.)

Authors

  • CHRISTINE MOUREAUX,

    1. Unité de Physique des Biosystèmes, Faculté universitaire des Sciences agronomiques de Gembloux, 8, Avenue de la Faculté, B-5030 Gembloux, Belgium,
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  • ALAIN DEBACQ,

    1. Unité de Physique des Biosystèmes, Faculté universitaire des Sciences agronomiques de Gembloux, 8, Avenue de la Faculté, B-5030 Gembloux, Belgium,
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  • JULIEN HOYAUX,

    1. Unité de Physique des Biosystèmes, Faculté universitaire des Sciences agronomiques de Gembloux, 8, Avenue de la Faculté, B-5030 Gembloux, Belgium,
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  • MARIE SULEAU,

    1. Unité de Physique des Biosystèmes, Faculté universitaire des Sciences agronomiques de Gembloux, 8, Avenue de la Faculté, B-5030 Gembloux, Belgium,
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  • DENIS TOURNEUR,

    1. Unité de Phytotechnie des Régions Tempérées, Faculté universitaire des Sciences agronomiques de Gembloux, 2, Passage des Déportés, B-5030 Gembloux, Belgium
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  • FRANÇOISE VANCUTSEM,

    1. Unité de Phytotechnie des Régions Tempérées, Faculté universitaire des Sciences agronomiques de Gembloux, 2, Passage des Déportés, B-5030 Gembloux, Belgium
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  • BERNARD BODSON,

    1. Unité de Phytotechnie des Régions Tempérées, Faculté universitaire des Sciences agronomiques de Gembloux, 2, Passage des Déportés, B-5030 Gembloux, Belgium
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  • MARC AUBINET

    1. Unité de Physique des Biosystèmes, Faculté universitaire des Sciences agronomiques de Gembloux, 8, Avenue de la Faculté, B-5030 Gembloux, Belgium,
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Marc Aubinet, tel. +32 81 62 24 89, fax +32 81 62 24 39, e-mail: aubinet.m@fsagx.ac.be

Abstract

The carbon balance of a winter wheat crop in Lonzée, Belgium, was assessed from measurements carried out at different spatial and temporal scales between November 2004 and August 2005. From eddy covariance measurements, the net ecosystem exchange was found to be −0.63 kg C m−2 and resulted from the difference between gross primary productivity (GPP) (−1.58 kg C m−2) and total ecosystem respiration (TER) (0.95 kg C m−2). The impact of the u* threshold value on these fluxes was assessed and found to be very small. GPP assessment was partially validated by comparison with an estimation scaled up from leaf scale assimilation measurements. Soil respiration (SR), extrapolated from chamber measurements, was 0.52 kg C m−2. Net primary productivity, assessed from crop sampling, was −0.83 kg C m−2. By combining these fluxes, the autotrophic and heterotrophic components of respiration were deduced. Autotrophic respiration dominated both TER and SR. The evolution of these fluxes was analysed in relation to wheat development.

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