1. Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, Iowa 50011, United States
2. Key laboratory of Vegetation Restoration and Management of Degraded Ecosystems, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
3. US Forest Products Laboratory, Madison, Wisconsin 53726, United States
4. Department of Bacteriology, University of Wisconsin, Madison, Wisconsin 53706, United States
5. Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
6. Department of Crop and Soil Sciences, The University of Georgia, Athens, Georgia 30602, United States
7. University of Wisconsin, Wisconsin Energy Institute, DOE Great Lakes Bioenergy Research Center, Madison, Wisconsin 53706, United States