Research on land cover change and its ecological effect on lower reaches of Lancang River - a case of Xishuangbanna , Yunnan Province, China. - Xiuping Zou; Qingwen Qi; Zengrang Xu; Lili Jiang 001; Daming He; Hu Peng; Jin Li 009; Yajuan Liang (IGARSS, 2005)