Yuanyuan Li, Northwest A&F University, State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Yangling, China, Gary Feng, USDA-ARS, Genetics and Sustainable Agricultural Research Unit, Starkville, United States, Halie Tewolde Sr, USDA-ARS, Genetics and Sustainable Agricultural Research Unit, Starkville, MS, United States and Ying Ouyang, USDA Forest Service-CBHR, Mississippi State, MS, United States