1. Joint Global Change Research Institute, Pacific Northwest National Laboratory, College Park, Maryland, 20740 USA
2. Great Lakes Bioenergy Research Center, Michigan State University, East Lansing, Michigan, 48824 USA
3. W.K. Kellogg Biological Station, Michigan State University, Hickory Corners, Michigan, 49060 USA
4. Agricultural Research Service, United States Department of Agriculture, Fort Collins, Colorado, 80526 USA
5. Department of Plant, Soil, and Microbial Sciences, Michigan State University, East Lansing, Michigan, 48824 USA
6. Department of Geography, Environment, and Spatial Sciences, Michigan State University, East Lansing, Michigan, 48824 USA