3[2]Carrel A.Man the Unknown.New York:Harper & Brothers,1985
4[3]Haword A.The soils and health.New York:Devin-Adair,1956
5[4]Fukouka M.The natural way of bariang,the theory and practice of green philosophy.Tokyo & New York:Japan publication,1985
6[5]Schumacher E F.Small is Beautiful.London:Blond and Btiggs,1973
7Kepe T.Environmental entitlements in Mkambati:Livelihoods,social institutions and environmental change on the wild coast of the Eastern Cape[R].Research Report,No.1,Sussex University,Institute for Development Studies and PLASS (Program for Land and Agrarian Studies),Sussex,U K.1999.
8Reddy S R C,Chakravarty S P.Forest dependence and income distribution in a subsistence economy:Evidence from India[J].World Development,1999,27 (7),1141-1149.
9Jayanath Ananda,Gamini Herath.Soil erosion in developing countries:a socio-economic appraisal[J].Journal of Environmental Management.2003,68:343-353.