e State Key Laboratory of Plateau Ecology and
Agriculture, Qinghai University, Xining 810016, China
*Corresponding author. Tel: +86 18997266915; Fax: +86
09715312959.
E-mail addresses:
wangqian091213@163.com (Qian
Wang), qhmclxy@163.com
(Xiangyang Li)
Word count (excluding figure legends and references): 7996