农业环境科学学报2025，Vol.44Issue(8)：2057-2063,7.DOI:10.11654/jaes.2024-0894
沟塘系统对面源污染物的工程拦截效果评估
Research on the engineering interception effectiveness of ditch-pond systems for non-point source pollutants
摘要
Abstract
This study adopts the overall approach of"source reduction-ecological interception-recycling"in the Gusheng area of Wanqiao Town,Dali City,Erhai Lake basin.Through technological integration and engineering application,it intercepts and purifies runoff water with high concentrations of nitrogen and phosphorus during the rice season(June to August)in the agricultural fields(including rice paddies and dry land,approximately 320 hm2)in the ecological ditch and pond system using methods such as wooden stake belts and plant-enhanced corridors.The purified water is then further treated in reservoirs and reused in rice fields.Monitoring the water quality and quantity of key inflows and outflows in the ecological ditch and pond during the 2023 rice season,the results show that the total reduction of nitrogen and phosphorus at the source in the agricultural fields throughout the growing season is 55.4 kg and 50.4 kg,respectively.Additionally,the demonstration project intercepts approximately 280 000 m3 of runoff water during the rice season.The average removal rates of total nitrogen and total phosphorus in the ecological ditch are 32％and 35％,respectively,while in the ecological reservoir,they are 31％and 33％.Overall,the ecological ditch and pond system achieves a removal rate of 31.5％for total nitrogen and 34.0％for total phosphorus.The nitrogen and phosphorus assimilation in the ecological ditch amounts to 817 and 67 kg,respectively,while in the ecological reservoir,it is 984.5 and 37.8 kg.The reuse and removal through water hyacinth harvesting contribute 57.1 kg and 7.0 kg,respectively.In summary,the comprehensive measures result in an actual assimilation of 1 914.0 kg of total nitrogen and 162.2 kg of total phosphorus.Based on monitoring assessments of inflow rates and nitrogen-phosphorus concentrations at the lake inlet points,the total nitrogen and phosphorus loads from the Gu Sheng area are 9 071 kg and 591 kg,respectively.Therefore,the ecological ditch and pond system reduces the pollution load of total nitrogen and total phosphorus from agricultural fields and village surface runoff in the Gusheng area by 17.4％and 21.5％,respectively.关键词
农业面源污染防治/工程应用/污染负荷削减/水质改善Key words
control of agricultural non-point source pollution/engineering application/pollutant load reduction/water quality improvement分类
资源环境引用本文复制引用
张雨晴,段婧婧,侯勇,徐玖亮,薛利红,许稳,杨林章..沟塘系统对面源污染物的工程拦截效果评估[J].农业环境科学学报,2025,44(8):2057-2063,7.基金项目
云南省重大科技专项"洱海流域农业高质量发展与面源污染防控协同的创新模式构建与示范"(202202AE090034) （202202AE090034）
云南省张福锁院士工作站(202305AF150055)Yunnan Provincial Major Science and Technology Project"Construction and Demonstration of Innovative Model for Coordination of High-quality Agricultural Development and Non-point Source Pollution Prevention and Control in Erhai Basin"(202202AE090034) （202305AF150055）
Yunnan Province ZHANG Fusuo Academician Workstation(202305AF150055) （202305AF150055）
