Dr. Roongreang Poolsiri is an assistant professor in the Department of Silviculture, Faculty of Forestry, Kasetsart University, Thailand. He graduated with B.S. and M.S. degrees in forestry from Kasetsart University in 1994 and 1997, respectively, and a Dr.nat.techn. (Forest Soils), from the University of Natural Resources and Life Sciences, Vienna, Austria (Universität für Bodenkultur, Wien), in 2003. He has been a lecturer at Kasetsart University since 2003, specializing in forest soil, forest tree nutrition, silviculture, and forest plantation. His current and previous research interests include forest soil properties, tree growth and biomass in natural forests and forest plantations, soil respiration and carbon content in forest soil and tree biomass, and nutrient cycling in natural forests and forest plantations.