College of Forestry Northwest A & F University Yangling 712100 China;
College of Forestry Northwest A & F University Yangling 712100 China;
College of Forestry Northwest A & F University Yangling 712100 China;
College of Forestry Northwest A & F University Yangling 712100 China;
College of Forestry Northwest A & F University Yangling 712100 China;
College of Art and Design Xi'an University of Technology Xi'an 710054 China.;
College of Forestry Northwest A & F University Yangling 712100 China;