Xiangming Xiao, University of Oklahoma Norman Campus, Norman, OK, United States, Geli Zhang, China Agricultural University, College of Land Science and Technology, Beijing, China, Jinwei Dong, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China, Zhenhua Zou, University of Oklahoma, Department of Microbiology and Plant Biology, Center for Spatial Analysis, Norman, OK, United States, Xinxin WANG, Fudan University, Shanghai, China and Marius Gilbert, Universite Libre de Bruxelles, Brussels, Belgium