1. Faculty of Natural Resources, Prince of Songkla University, Songkhla, Thailand
2. Land Development Department, Bangkok, Thailand
3. CIRAD, UMR ECO&SOLS, Montpellier, France
4. CIRAD, UPR Systèmes de Pérennes, Montpellier, France
5. IRD, UMR ECO&SOLS, Montpellier, France