Author Contributions
Wang XiaoLong conceived and
supervised the study.Gao Shan carried out the spatial .
modeling, the Least Costs Path analysis,
interpretation of results, map design and draft writing. Lv JiaNing also
contributed to the data filtering and the map design. Wang XiaoLong,
Wang HaoNing and Huang LiYa contributed to the discussion and manuscript
writing. Xu GuoYong provides DEM data and help in cartography. All
authors significantly contributed to the final manuscript and gave final
approval for publication.