1Costanza R,Ralph d' Arge,Rudolf de Groot. The value of the world's ecosystem services and natural capital[J].Nature,1997,(6630):253-260.doi:10.1038/387253a0.
2Mitsch,W J,Gosselink J G,Anderson C J,Zhang L. Wetland Ecosystems[M].New York:John Wiley and Sons,Inc,2009.