Grassland Research Station College of Animal Science and Technology Northeast Agricultural University Harbin 150030 China;
The School of Management Tianjin University Tianjin 300071 China;
School of Economy-Management Tianjin University of Technology Tianjin 300191 China;
Department of Breast Surgery Cancer Institute Fu-Dan University Medical Center Shanghai 200032 China;
Department of Biological Sciences and Biotechnology Tsinghua University Beijing 100084 China;
clonal plant population; genetic distance; genetic variation; geographic distance; molecular variation;