1. AMAP, INRA, IRD, CIRAD, CNRS, and University of Montpellier; Montpellier France
2. Now at Max Planck Institute for Biogeochemistry; Jena Germany
3. CIRAD, UMR Eco&Sols; Montpellier France
4. IRD, Soils and Fertilizers Research Institute; Hanoï Vietnam
5. IRD Institute of Ecology and Environmental Sciences of Paris (iEES-Paris UMR 242); Paris France
6. CATIE, Programa de Agroforestería y Agricultura Sostenible; Turrialba Costa Rica
7. Department of Agricultural Land Management; IRD; Vientiane Laos
8. CIRAD, UMR System; Montpellier France
9. IRD; Université Pierre et Marie Curie; Paris France
10. Centro de Investigaciones Agronómicas; Universidad de Costa Rica; San José Costa Rica