4Shaw S P, Fredine C G. Wetlands of the United States, theirextent and their value for waterfowl and other wildlife [M]. Washington D.C. USA: U.S. Department of Interior, Fish and Wildlife Service, Circular 39, 1986.
5Dahl T E, Johnson C E. Wetland status and trends in the Conterminous United States Mid-1970s to Mid-1980s[M]. Washington, D.C. USA: U.S. Department of Interior, Fish and Wildlife Service, 1991.
6Kuzila M S, Rundquist D C, Green J A. Methods for estimating wetland loss: the Rainbasin region of Nevraska, 1927-1981 [J]. Journal of Soil Water Conservation, 1991,46(6):441-446.
7Kirkby M J, Kneale P E, Lewis S L. Modelling the form and distribution of peat mires [A]. Hugues M R, Heathwaite A L.(Eds.), Hydrology and hydrochemistry of British wetlands [C]. New York: Wiley, 1995.83-93.
8Merot Ph, Squividant H, Aurousseau P, et al. Testing a climato-topographic index for predicting wetlands distribution along an European climate gradient [J]. Ecological Modelling, 2003,163:51-71.
