Impact of Land Use/Land Cover and Landscape Pattern on Water Quality in Dianchi Lake Basin, Southwest of China

The water quality of a basin is pronouncedly affected by the surrounding types land use. Analyzing impact LULC and landscape patterns on critical for identifying potential drivers. To further study how LUCC affects in typical plateau lake basin, this investigated impacts land-use Dianchi Lake Basin Southwest China. We analyzed changes pattern calculated CWQI (Canadian Water Quality Index) value based indexes (PH, total phosphorus (TP), nitrogen (TN), chemical oxygen demand (COD), dissolved (DO), permanganate index (CODMn), five-day biochemical ox-ygen (BOD5), ammonia (NH3-N), turbitidy, chlorophyll-a (Chla)), used RDA (Redundancy Analysis) SMLR (Stepwise multiple linear regression) methods, coupling degree, coordination geographical detector model to explore relationship between type. results show that (1) were obvious: majority land, which was originally forest became built 2020 farmland 1990 (except water). Landscape indicated almost all first scattered, then gathered from 2020. (2) Changes lagged behind types, variation trends similar trends. decreased nearly fashion 1998, exhibited slight change 1999 2013, quickly increased 2013. (3) Land-use demonstrated tight correlation with quality, LPI most dominant factor both Caohai Waihai Lake. (4) There different affecting degrees