Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 12 2009 10.5194/bg-6-2957-2009 http://www.biogeosciences.net/6/2957/2009/ http://www.biogeosciences.net/6/2957/2009/bg-6-2957-2009.html http://www.biogeosciences.net/6/2957/2009/bg-6-2957-2009.pdf 2957 2971 2009-12-11 Simultaneous measurements of CO2 and water exchanges over three agroecosystems in South-West France P. Stella E. Lamaud lamaud@bordeaux.inra.fr Y. Brunet J.-M. Bonnefond D. Loustau M. Irvine Ephyse, INRA, Villenave d'Ornon, France During the last few decades, many studies have been performed to determine water and carbon budgets of broadleaf and deciduous forests, crops and grasslands. However, since most measurements have been made in different regions and at different periods, it is difficult to compare the results directly. In order to evaluate accurately the respective contribution of various agroecosystems to global water and carbon exchanges, it is necessary to compare data obtained in similar climatic and weather conditions. To address this question, we present the results from simultaneous measurements carried out during one year over three typical agroecosystems of the Les Landes region in South-West France:~an agricultural field with maize from 29 May to 18 October, a young (5 year-old) pine forest and a mature (37 year-old) pine forest. All measurements were collected as part of the Regional Experiment component of the CarboEurope-IP project. During most of the year, the agricultural field without vegetation is a source of CO2, but from late June to early September the maize crop becomes a stronger carbon sink than the forests. 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