1. University of Oklahoma, Department of Microbiology and Plant Biology, Norman, Oklahoma, USA
2. University of Oklahoma, Institute for Environmental Genomics, Stephenson Research and Technology Center, Norman, Oklahoma, USA
3. USDA, Agricultural Research Service, Grazinglands Research Laboratory, El Reno, Oklahoma, USA
4. University of Oklahoma, School of Civil Engineering and Environmental Sciences, Norman, Oklahoma, USA
5. Lawrence Berkeley National Laboratory, Earth and Environmental Sciences, Berkeley, California, USA
6. School of Environment, Tsinghua University, State Key Joint Laboratory of Environment Simulation and Pollution Control, Beijing, China