4Smith M S.Global Change Impacts on Pastures and Rangelands (Implementation Plan)[M].Canberra:GCTE Core Project Office,1995.
5Zheng D,Rademacher J,Chen J,et al.Estimating above ground biomass using landsat 7 ETM+ data across a managed landspace in northern Wisconsin,USA[J].Remote Sensing of Environment,2004,9(3):402-411.
6Brown S L,Schroeder P,Kern J S.Spatial distribution of biomass in forests of the eastern USA[J].Forest Ecology and Management,1999,123:81-90.
7Chameides W L,Perdue E M.Biogeochemical Cycles[M].Oxford University Press,1997.
