Species composition and point pattern analysis of standing trees in secondary Betula albo-sinensis forest in Xiaolongshan of west Qinling Mountains.
GUO Yao-xin1, KANG Bing2, LI Gang2, WANG De-xiang3, YANG Gai-he1,3, WANG Da-wei4
1College of Agronomy, Northwest A & F University, Yangling 712100, Shaanxi, China; 2College of Life Science, Northwest A & F University, Yangling 712100, Shaanxi, China; 3College of Forestry, Northwest A & F University, Yangling 712100, Shaanxi, China; 4Xiaolongshan Research Institute of Forestry, Tianshui 741020, Gansu, China