We thank Dr. F.Z. Zhao and Master students P.S. Sun, J.H. He and R. Du of the Northwest Agriculture and Forest University for helping to do the field survey and lab experiments of this article. We are grateful to Dr. K.Y. Wang and Dr. H. Fan of the Shihezi University for valuable comments. We appreciate the financial support of the special fund for forest-scientific Research in the Public Interest (201304312), the National Natural Science Fund Project (U1203282, 41301601), the Applied Basic Research Programs of Science and Technology Commission Foundation of Xinjiang Bingtuan (2016AG003) and the Ph.D. Program Foundation of the Shihezi University (RCZX201527).

Conflicts of Interest

The authors declare no conflicts of interest.


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