1. Center for International Forestry Research (CIFOR) Lima Peru
2. Venezuelan Institute for Scientific Research (IVIC) Caracas Venezuela
3. Center for International Tropical Agriculture (CIAT) Cali Colombia
4. Center for International Forestry Research (CIFOR) Bonn Germany
5. Department for Soil Quality Wageningen University & Research Wageningen The Netherlands
6. Instituto de Investigaciones de la Amazonia Peruana (IIAP) Iquitos Peru