1. School of Forest Resources, University of Maine, Orono, ME, USA;
2. Center for Research on Sustainable Forests, University of Maine, Orono, ME, USA;
3. Northern Research Station, Northern Forest Science and Applications, USDA Forest Service, Bradley, ME, USA;
4. Northern Research Station, Forest Inventory and Analysis, USDA Forest Service, Durham, USA;
5. Climate Change Institute, University of Maine, Orono, ME, USA