1Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry,
Beijing 100091, Beijing, China
2Key Laboratory of Forest Ecology and Environment,State Forestry Administration,
Beijing 100091, Beijing, China
3Beijing Collaborative innovation center for eco-environmental improvement with forestry and fruit trees,
Beijing 100091, Beijing, China
4Liaoning Academy of Forestry, Shenyang 110032, Liaoning, China
Submission date: 2016-09-07
Final revision date: 2016-12-30
Acceptance date: 2016-12-30
Online publication date: 2017-05-24
Publication date: 2017-05-26
Pol. J. Environ. Stud. 2017;26(3):955–959