参考文献格式
bibliography

\newpage
\begin{thebibliography}{99}
\bibitem{DJ1} Daniel J.P, Requate Till. \emph{A Course in environmental economics: theory, policy, and prictice} [M]. New York, NY: Cambridge University Press, 2017: 649-671.
\bibitem{WG2} William G.S, Elin M.W, C.Patrick K. \emph{Engineering Economy Fifteeth Editioon} [M]. Pearson Education Asia LTD and Publishing House of Electronic Industry, 2013.
\bibitem{RN3} Robert N.Stavins \emph{Economics of the environment 6th ed} [M]. W.W. Norton Company, Inc., 2012.
\bibitem{PB4} Peter B.,Gloria H., \emph{The Economics of the environment -6th ed.} [M]. Beijing: China Renmin University Press, 2013.
\bibitem{OY5} OUYANG.Z.Y, WANG X, MIAO H.A, \emph{primary study on Chinese terrestrial ecosystem services and their ecological-economic values} [J]. Acta Ecologica Sinica, 1999, 19(5): 607-613
\bibitem{XJ6}Yin X.J，Song X.Y，Cai G.Y.,\emph{Valuation of wetland ecosystem services: Progress and perspectives}[J],Journal of Glaciology and Geocryology，2014，36(3) : 759 － 766．
\bibitem{FP7}Meng F.P, Li R.Q, \emph{Progress in quantitative Research on the Service value of Coastal Wetland ecosystem based on energy Analysis},School of Environmental Science and Engineering China Ocean University Shandong Qingdao 266100
\bibitem{YL8}YANG L，KONG F.L,XI M,LI Y,WANG Sen,\emph{Ecosystem services assessment of wetlands in Qingdao based on meta-analysis} ,College of Environmental Sciences and Engineering,Qingdao University,Qingdao 266071，China
\bibitem{JY9}Lin J.Y, Zhu Y,\emph{Evaluation of Suzhou Wetland Ecosystem Service Value: Empirical Research Based On Costanza Model},Suzhou University of Science and Technology, Suzhou 215011, Jiangsu, China
\bibitem{xl10} Shi X.L, Wang W, Modification of Costanza's model of ecosystem services valuation and its application in China, P. R. China, Graduate School, Chinese Academy of Sciences, Beijing 100039
\bibitem{NL11} Li N, Li L.W., Zhang Y.L., Lu D.S, Wu M, Changes in ecosystem Service value of Coastal Wetland in Hangzhou Bay, Nanjing Forestry University, Southern Modern Forestry Innovation Center, Nanjing, Jiangsu 210037, Center for Global change and Earth observation, Michigan State University, East Lansing, USA, 48823;
\bibitem{XJ12} Xu J, Chen H.G, Liu N, Qi S.Y, Hong T.J, Yuan H, The change of Urban Green Space ecosystem and the difference of Ecological Service value between 2004 and 2014 in Shenyang City, College of Life Sciences and Engineering, Shenyang University, B. key Laboratory of Pest Control and Ecological Security in Liaoning Province, Shenyang 110044.

\end{thebibliography}`