5COMMINS K W. The Structure and Function of Stream Eco- systems[ J]. Bio Science, 1974, 24 : 631 - 641.
6联合国科教文组织.千年生态系统评估[R].巴黎:联合国科教文组织,2005.
7COSTANZA R, ARGE R, GROOT R, et al. The Value of the World' s Ecosystem Services and Natural Capital [ J ]. Ecological Economics, 1998, 25(1) : 3 - 15.