1. INRA, UMR 1041 CESAER; Dijon F-21079 France
2. AgroParisTech; Paris F-75231 France
3. Université Paris-Sud, Laboratoire ESE (UMR 8079); Orsay F-91405 France
4. CNRS; Orsay F-91405 France
5. CIRAD, UMR ECO&SOLS; Montpellier F-34398 France
6. INRA, URFM; Avignon F-84914 France
7. CNRS, GREThA; Bordeaux F-33600 France