生态学报2026，Vol.46Issue(9)：4468-4482,15.DOI:10.20103/j.stxb.202602040367
白洋淀流域典型平原农业小流域汛期面源污染模拟
Simulation of diffuse source pollution in typical plain agricultural small watersheds of the Baiyangdian Basin during the flood season
摘要
Abstract
The North China Plain is characterized by concentrated,pulse rainfall distributions during the flood season,with densely distributed ditches and channels,where pumping stations serve as a critical pathway for agricultural drainage.To address these regional features,an hourly-scale SWAT model was developed in this study by incorporating ditch-channel and pumping station operations.Using the Anzhou small watershed as a case study in the lower Baiyangdian Basin,the model's applicability was assessed based on measured event data during the flood season,and performed an analysis of agricultural non-point source pollution characteristics.Key findings included:(1)Under rainfall event scenarios,the hourly SWAT model could accurately captured event-based hydrological and water quality processes.The mean R2 and RMSE between simulated and observed water depth were 0.90 and 0.1146 m,respectively.On the other hand,the simulation errors for total nitrogen(TN)and total phosphorus(TP)concentrations in the ditch system were calculated as 0.2524 mg/L and 0.045 mg/L,respectively.(2)Runoff intensity and total nitrogen load from village areas were significantly higher than from croplands,whereas croplands were identified as high-risk hotspots for total phosphorus export.(3)Nitrate export from village surfaces occurred mainly via surface runoff,while groundwater leaching dominated nitrate export from cropland ecosystems.In croplands,phosphorus was primarily exported in adsorbed forms.(4)The cumulative rainfall threshold for triggering pumping station drainage in the Anzhou watershed was approximately 150 mm,corresponding to exported loads of 1.95 tons(range:0.35-3.60 tons)for total nitrogen and 0.375 tons(range:0.10-0.65 tons)for total phosphorus.This study provides a reliable technical and modeling tool to support precise prevention and control of agricultural diffuse source pollution during flood seasons,enabling systematic simulation and risk identification across the entire pollution process and its components.关键词
沟渠泵站/小时 SWAT 模型/场次事件模拟/污染特征识别Key words
ditch-pump system/hourly SWAT model/event-based simulation/pollution characteristics identification引用本文复制引用
庞树江,杜新忠,李慧芩,王娜,王若兮,栗志航,闫铁柱..白洋淀流域典型平原农业小流域汛期面源污染模拟[J].生态学报,2026,46(9):4468-4482,15.基金项目
国家重点研发计划资助(2024YFD1700800) （2024YFD1700800）
