4Williams, Gerald W. The USDA Forest Service-The First Century. Washington, D.C.: USDA Forest Service.
5Cathy W D,Brian W G.An assessment of forest ecosystern health in the southwest.USDA Forest Service General Technical Report RM-GTR-295,1997:1～5
6Monnig E,Byler J.Forest health and ecological integrity in the northern Rockies.USDA Forest Service Forest Pest Management Report 92-7,1992:18
7Joseph P,Kieth T,Schwanki J,et al.Restoring forest health in the Blue Mountains:a 10-year strategic plan[J].Foresters,1991,61(2):3～12
8USDA Forest Service.Northeastern area forest health report.USDA Forest Service report NA-TP-03-93.1992:57
9Kolb T E,Wagner M R,Covington W W.Concepts of forest heath:utilitarian and ecosystem perspectives[J].Journal of Forestry,1994,92:10～15
10Aviva P,David J R,Loren V,et al.Forests and societal values:comparing scientific and public perception of forest health[J].The Environmentalist,1999,19:239～249
