1. Department of Forestry and Environmental Resources, North Carolina State University, Raleigh, NC 27695, USA.
2. Granflor Agroflorestal, B. Mont Serrat, Porto Alegre 90480-001, Brazil.
3. School of Forest Resources, University of Maine, Orono, ME 04469-5755, USA.
4. Department of Forest Science, Federal University of Lavras, Lavras, Minas Gerais 37200-000, Brazil.