1. Department of Forest Ecosystems and Society; Oregon State University; Corvallis Oregon 97331 USA
2. Department of Agriculture and Environmental Sciences; University of Bari “A. Moro”; Via Amendola 165/A 70126 Bari Italy
3. Pacific Northwest Research Station; USDA Forest Service; Corvallis Oregon 97331 USA
4. Center for Global Change and Earth Observations (CGCEO); Michigan State University; East Lansing Michigan 48823 USA