1. Department of Forest Ecology and ManagementSwedish University of Agricultural Sciences (SLU) Umeå SE‐901 83 Sweden
2. World Agroforestry Centre (ICRAF) PO Box 30677 Nairobi 00100 Kenya
3. Unité de Formation et Recherche en Sciences de la Vie et la TerreUniversité de Ouagadougou Ouagadougou 03 BP 7021 Burkina Faso
4. World Agroforestry Centre (ICRAF), West and Central Africa Regional Office, Sahel Node Bamako BP E5118 Mali