Evaluating agricultural non-point source phosphorus pollution in Hebei Province in 2023 and analyzing its impact on typical exceedance sections
To understand and grasp the contribution of agricultural non-point source pollution to the exceedance of monitoring sections,this study investigates the situation of agricultural non-point source total phosphorus pollution in Hebei Province in 2023,and deeply explores its relationship with typical exceedance sections,providing scientific data support for the precise prevention and control of agricultural non-point source total phosphorus pollution and the improvement of water environment in Hebei Province.Based on the remote sensing distributed non-point source pollution estimation model(DPeRS model),a 30 m spatial resolution database of agricultural non-point source pollution in Hebei Province for the year 2023 was constructed.This study will analyze the spatial characteristics of agricultural non-point source pollution emissions and into river loads in Hebei Province,identify the priority control units for agricultural non-point source pollution,extract typical total phosphorus exceedance sections within the province based on water quality monitoring data,and analyze the impact of agricultural non-point source total phosphorus pollution on total phosphorus exceedance sections in conjunction with priority control units.The results show that the total emission of agricultural non-point source total phosphorus pollution in the province in 2023 was 13 300 tons,with a into river load of 1 500 tons,presenting a trend of being higher in the south and lower in the north,with an assessment accuracy higher than 80%;the area of the agricultural non-point source total phosphorus pollution priority control units accounts for 40.6% of the total area of priority control units,and it is necessary to focus on implementing source and into river process synergistic priority control measures in areas such as Handan City,Baoding City,and Qinhuangdao City;among the three typical sections with more frequent total phosphorus concentration exceedances in 2023,the total phosphorus exceedance at the Matouli section is mainly affected by the emission and into river process synergy of agricultural non-point source total phosphorus pollution from field runoff,the total phosphorus exceedance at the Nanliuzhuang section is mainly affected by the into river process of agricultural non-point source total phosphorus pollution from both field runoff and livestock breeding,and the impact of agricultural non-point source pollution on the Nan Dagang Wetland entrance section is minimal,with the section being close to the Bohai Bay,it is necessary to focus on investigating the impact of point sources such as aquaculture.The study indicates that there is a significant synergistic relationship between the frequency of total phosphorus concentration exceedances in typical exceedance sections in Hebei Province and the high incidence of agricultural non-point source pollution during the flood season.
agricultural non-point sources pollutiontotal phosphorusDPeRS model
万方数据
维普
