1. W.K. Kellogg Biological Station Michigan State University Hickory Corners Michigan USA
2. Department of Plant, Soil, and Microbial Sciences Michigan State University Hickory Corners Michigan USA
3. Great Lakes Bioenergy Research Center Michigan State University East Lansing Michigan USA
4. Department of Integrative Biology Michigan State University East Lansing Michigan USA
5. Cary Institute of Ecosystem Studies Millbrook New York USA
6. Department of Soil and Crop Sciences and Natural Resource Ecology Laboratory Colorado State University Fort Collins Colorado USA
7. Institute of Biological and Environmental Sciences University of Aberdeen Aberdeen UK