1. Postdoctoral Fellow, Geoscience Lab, World Agroforestry Centre, United Nations Ave., Gigiri, Nairobi, Kenya (corresponding author).
2. Professor, Dept. of Bioresource Engineering, Macdonald Campus of McGill Univ., 21111 Lakeshore Rd., SteAnne-De-Bellevue, QC, Canada H9X3V9.
3. Ph.D. Student, Dept. of Bioresource Engineering, Macdonald Campus of McGill Univ., 21111 Lakeshore Rd., SteAnne-De-Bellevue, QC, Canada H9X3V9.