RAI S C,SUNDRIYAL R C.Tourism and biodiversity conservation:The Sikkim Himalaya〔J〕.Ambio,1997,26:235-242.
[7]
SCHERRER P,PICKERING C M.Effects of grazing,tourism and climate change on the alpine vegetation of Kosciuszko National Park〔J〕.Victorian Naturalist,2001,118:93-99.
[8]
PICKERING C M,HILL W.Impacts of recreation and tourism on plant biodiversity and vegetation in protected areas in Australia 〔J〕.Journal of Environmental Management,2007,85:791-800.