4[5]Austrheim G,Gunilla E,Olsson A,et al.1999.Land-use impact on plant communities in semi-natural sub-alpine grasslands of Budalen,central Norway[J].Biol.Conserv.,87:369~ 379.
5[6]Bierregaard RO,Laurance WF,Gascon C,et al.2001.Principles of forest fragmentation and conservation in the Amazon[A].In:Bierregaard RO,eds.The Ecology and Conservation of a Fragmented Forest[C].New Haven:Yale University Press,371 ~385.
6[7]Biondini ME,Patton BD,Nyren PE.1998.Grazing intensity and ecosystem processes in a northern mixed-grass prairie,USA[J].Appl.Ecol.,8:469 ~479.
7[8]Blois S,Domon G,Bouchard A.2002.Landscape issues in plant ecology[J].Ecography,25:244 ~256.
8[9]Bruun HH.2000.Patterns of species richness in dry grassland patches in an agricultural landscape[J].Ecography,23:641~650.
9[10]Burke DM,Nol E.2000.Landscape and fragment size effects on reproductive success of forest-breeding birds in Ontario[J].Ecol.Appl.10:1749 ~1761.
10[11]Butaye J,Jacquemyn H,Hermy M.2001.Differential colonization causing non-random forest plant community structure in a fragmented agricultural landscape[J].Ecography,24:369 ~380.