Water pollution characteristics of inflowing rivers under different land-use patterns in the Daye Lake basin: pollution mode and management suggestions.

Land use/land cover (LULC) conditions can have a profound impact on the water quality of rivers, lakes, and other water bodies within a basin. Land use status of Daye Lake basin in 2019 has been shown by Landsat 8 OLI image, water quality of Daye Lake, and 12 inflowing rivers have been investigated once a month; this study provides a comprehensive analysis of the water pollution characteristics of the inflowing rivers and lake in the basin under different LULC patterns, and providing a reference for the scientific planning of land-use types in the basin and land use research in lake basins in subtropical areas. Pollutants are mainly introduced to Daye Lake from the west (such as Da Gang) and north (such as Linjiaju Gang), with concentrations gradually decreasing within the lake from west to east. Construction land is closely associated with the total nitrogen (TN), total phosphorus (TP), permanganate index (CODMn), and ammonia nitrogen (NH3-N) inputs to the basin, which can be trapped by vegetation. Agricultural dryland can contribute acid and dissolved oxygen (DO) to water. Precipitation can influence the input of pollutants, with a stronger effect on TN and weaker effect on TP. Pollutants accumulate from the inlets to the centre of the lake, with longer retention times during the dry season.

Ren W ，Wu X ，Yang J ，Luo L ，Liang S ，Yang H ... -  《-》

[Relationship Between Agricultural Land and Water Quality of Inflow River in Erhai Lake Basin].

Pang Y ，Xiang S ，Chu ZS ，Xue LQ ，Ye BB ... -  《-》

Water pollution characteristics and analysis of Chaohu Lake basin by using different assessment methods.

Yang X ，Cui H ，Liu X ，Wu Q ，Zhang H ... -  《-》

Temporal and spatial characteristics of the water pollutant concentration in Huaihe River Basin from 2003 to 2012, China.

Dou M ，Zhang Y ，Li G 《-》

Insights into spatiotemporal variations of the water quality in Taihu Lake Basin, China.

Taihu Lake Basin is highly developed but suffers from perennial water shortages due to pollution. Most studies have been limited to examining the water quality in specific areas, but few have investigated the entire basin. This study was based on official water quality data obtained from 565 sites in the monitoring network, thereby covering the entire basin. The water quality spatiotemporal variations were explored by statistical analysis, and the precise spatial distribution of the main pollutants was analyzed by heat maps. Only 29.09% of the water quality assessment results showed "drinkable," whereas 28.63% showed "moderate" and "severe" pollution. The "severe" proportion had a significant declining trend (R2 = 0.933) and was affected by the variations of nitrogen that was related to rainfall and anthropogenic activities. The water quality spatial variation was most likely related to anthropogenic influence and land use. The water quality in the developed and densely populated urban areas was poor, especially in downtown Shanghai. NH3-N, TN, TP, BOD5, COD, CODMn, and DO were the main pollutants that affected the water quality. NH3-N and TN were major reduction targets. NH3-N was the main pollutant that deteriorated the water quality in most densely populated urban areas. Many lakes and reservoirs were highly polluted with TN. Controlling domestic sewage may be effective to improve the water quality. This study makes up for the limited research on the water quality spatiotemporal variations in the entire Taihu Lake Basin and provides beneficial information and suggestions for decision-making regarding the water management.

Zhang J ，Zhang L ，Chai Q ，Shen Y ，Ji L ，Zhao Q ，Li X ，Liu W ，Li C ... -  《-》