3Costanza R, d' Arge R, Groot R D, et al. The value of the world's ecosystem services and natural capital[J]. Nature, 1987, 387: 253-260.
4Costanza R, Daly H E. Natural capital and sustainable development[J].Conservation Biology, 1992, 16(1):37-46.
5El Serafy S. The environment as capital [M]//Ecological ecnomics: The scicnce and management of sustainability. New York: Columbia University press, 1991.
6Hu D. Eco--capital and its services in urbanization [R]//IHDP update, newsletter of the international human dimensions program on global environmental change, 03/2002.
