6FORMAN R T T, GODRON M. Landscape ecology[M]. New York:Wiley, 1986.
7BISCHOFF A. Greenways as vehicles for expression[J].Landscape Urban Planning, 1995,33: 317-325.
8PACE F. The Klamath Corridors:preserving biodiversity in the Klamath national forest[M]//HUDSON W E. Landscape linkages and biodiversity. Washington D C: Island Press, 1991:105-116.