[1]Department of Surveying and Land Use, School ofGeoscience and Surveying Engineering, China University ofMining and Technology (Beijing), D11 Xueyuan Road,Haidian District, Beijing 100083, China [2]Division of Plant and Soil Sciences, West VirginiaUniversity, Morgantown, WV 26506-6108, USA;
[1]Department of Surveying and Land Use, School ofGeoscience and Surveying Engineering, China University ofMining and Technology (Beijing), D11 Xueyuan Road,Haidian District, Beijing 100083, China [2]Division of Plant and Soil Sciences, West VirginiaUniversity, Morgantown, WV 26506-6108, USA;