3Rudolf S. de Groot et al. A typology for the classification,description and valuation of ecosystem functions, goods and services.Ecological Economics. 41(2002): 393--408.
4Tyron J. V enn. Financial and economic performance of long-rotation hardwood plantation investments in Queensland, Australia.Forest Policy and Economics. xx(2003): xxx--xxx.
5Zhongwei Guo et al. Ecosystem functions, services and their values-a cas e study in Xingshan County of China. Ecological Economics, 38(2001 ) : 141 -- 154.
