The agricultural non-point sources pollution in the upper reaches of the Yangtze River based on source-sink ecological process The change of land use/cover and characteristics of landscape pattern in arid areas oasis: a case study of Jinghe County, Xinjiang Province Effects of land use change on landscape pattern of a typical arid watershed in the recent 50 years: a case study on Manas River Watershed in Xinjiang A functional classification method for examining landscape pattern of urban wetland park: a case study on Xixi Wetland Park, China Landscape dynamics of Baiyangdian Lake from 1974 to 2007 Applying landscape ecological concepts in urban land use classification