8Cynthia Croissant. Landscape pattems and parcel boundaries: analysis of composition and configuration of land use and land cover in south-central Indiana [J].Agficulture Ecosystem and Environment, 2004, 101.
9Ostrom, E. Governing the Commons. The Evolution of Institutions for Collective Action. Cambridge University Press, Cambridge, UK 1990.
10Statistic data from the management bureau of Nabanhe Watershed National Nature Reserve [Z].
