8United Nations Environment Programme, Global Environment Outlook 2000[ Z] .1999.
9Vertessy R A, Hatton, T. J. Predicting water yield from a mountain ash forest catchment using a terrain analysis based catchment model[J]. J of Hydrology. 1993, 150: 665-700.
10Ministry of Water Resources, People's Republic of China. Chinese communiqué of water resources in 1999[N]. People's Daily. 2000-09-21.[中华人民共和国水利部. 1999年中国水资源公报[N]. 人民日报, 2000-09-21.]