2Bjorklund J., Limburg K. E., Rydberg T. Impact of production intensity on the ability of the agricultural landscape to generate ecosystem services: an example from Sweden. Ecol-Econ., 1999,29: 269~ 291
3Corwin D. L.,Wagenet R.J. Application of GIS to the modeling of nonpoint source pollutions in the vadose zone: A conference overview. J. Environ. Qual., 1996,25 (3): 403 ~ 411
4Ebbert J.C.,Kim M.H. Soil processes and chemical transport. J Environ. Qual.,1998,27:372~380
5Pimentel D., Harvey C., Resosudarmo P., et al. Environmental and economic costs of soil erosion and conservation benefits. Science, 1995,267:1117~1123
6IPCC Climate Change 1995: The Science of Climate Change. Cambridge, U. K: Cambridge University Press, 1996
7Costanza R., d' Arge R., de Groot R., et al. The value of the world' s ecosystem services and natural capital. Nature, 1997,387: 253 ~ 260
8Lal R., Kimble J. M., Follet R. F., et al. The Potential of US Cropland to Sequestration Carbon and Mitigation to the Greenhouse Effect. Sleeping Bear Press, 1998.55~ 87