1. INRA – Climat, Sol & Environnement, Domaine St Paul, Site Agroparc, 84914 Avignon cedex 9, France;
2. Present address: IRD‐IWMI‐NAFRI, BP 06, Vientiane, Laos
3. Centre for Water in the Minerals Industry, Sustainable Minerals Institute, University of Queensland, Brisbane 4072, Australia;