在大型河流中,较少研究多种环境因素对水质模式的影响。景观分析,多种统计方法,水质指数(WQI)用于检测中国最大河流的水质模式和影响因素,长江。与旱季相比,雨季总磷(TP)明显较高,化学需氧量(COD),总悬浮固体(TSS),和浊度(TUR)。WQI在雨季和旱季显示“中等”和“良好”水质,分别。与其他网站相比,三峡大坝下游的上游地区TP较低,TN,两个季节的TSS和TUR,在潮湿和干燥季节,水温越来越高,分别。水质模式主要由土地利用的异质性驱动(即,湿地,农田,和城市土地),水文学(即,水流,水位),和气候(即,降雨,空气温度)。雨季的水质主要由土地利用驱动,而旱季主要由土地利用和水文学的联合影响驱动。大型流域管理的决策者和监管者可能需要制定计划,考虑到人为和自然驱动因素对水质保护的影响。
Influences of multiple environmental factors on water quality patterns is less studied in large rivers. Landscape analysis, multiple statistical methods, and the water quality index (WQI) were used to detect water quality patterns and influencing factors in China\'s largest river, the Yangtze River. Compared with the dry season, the wet season had significantly higher total phosphorus (TP), chemical oxygen demand (COD), total suspended solids (TSS), and turbidity (TUR). The WQI indicated \"Moderate\" and \"Good\" water quality in the wet and dry seasons, respectively. Compared with other sites, the upper reach sites that immediately downstream of the Three Gorges Dam had lower TP, TN, TSS and TUR in both seasons, and had lower and higher water temperature in the wet and dry seasons, respectively. Water quality patterns were mainly driven by heterogeneity in land use (i.e., wetland, cropland, and urban land), hydrology (i.e., water flow, water level), and climate (i.e., rainfall, air temperature). Water quality in the wet season was primarily driven by land use while the joint effect of land use and hydrology primarily drove in the dry season. Decision-makers and regulators of large river basin management may need to develop programs that consider influences from both human and natural drivers for water quality conservation.