基金We thank the staff in Honghe Water Authority, Environmental Protection Agency, Meteorological Bureau, Forestry Bureau, Municipal Bureau of Land, Agricultural Bureau and Traffic Bureau, for their supports for providing information collecting samples. We also thank Prof. Chen Min at Sydney University for her assistance. This work was supported by the National Key Basic Research Development Program of China (Grant No. 2003CB415104), and National Natural Science Foundation of China (Grant No. 50239020).