1. College of Water Resources and Civil Engineering, China Agricultural University, Beijing, PR China;
2. Genetics and Sustainable Agricultural Research Unit, United States Department of Agriculture, Starkville, MS, USA;
3. College of Agricultural and Life Sciences, University of Wisconsin-Madison, Madison, WI, USA;
4. Research Center for Eco-environmental Sciences, Chinese Academy of Sciences, Beijing, PR China;
5. Department of Environmental and Sustainable Engineering, University at Albany, Albany, NY, USA