1Department of Forestry, Agricultural College, Shihezi University, Shihezi, Xinjiang 832000, China
2College of Forestry, Northwest A&F University, Yangling 712100, China
Submission date: 2014-04-02
Final revision date: 2014-06-09
Acceptance date: 2014-07-08
Publication date: 2014-12-16
Pol. J. Environ. Stud. 2014;23(6):2271–2277