1. Department of Natural Resources and Environmental Management University of Hawaii at Manoa Honolulu HI USA
2. Department of Biogeochemical Processes Max Planck Institute for Biogeochemistry Jena Germany
3. Department of Tropical Plants and Soil Sciences St. John Plant Science Laboratory University of Hawaii at Manoa Honolulu HI USA
4. Texas A&M AgriLife Research Blackland Research and Extension Center Temple TX USA
5. Grassland Soil and Water Research Laboratory USDA, Agricultural Research Service Temple TX USA