农业环境科学学报2025，Vol.44Issue(8)：2009-2022,14.DOI:10.11654/jaes.2025-0053
生态沟渠对太湖流域稻田径流的净化效能及其配置规模
Purification efficiency and allocation scale of ecological ditches for pollutants from paddy field runoff in Taihu Lake basin
摘要
Abstract
In order to analyze the adaptation scale between ecological ditches and farmland area,based on the field operation test of purifying rice runoff by ecological ditches in Taihu Lake basin,three natural drainage ditches in Wujin rice cultivation area of Changzhou were selected for ecological transformation.A tiered purification system was constructed by introducing aquatic plants and intercepting permeable dams(filled with environmentally friendly substrates)into the ditches.Different treatments were implemented based on ditch length:Ditch 1(ED1,77 m)was equipped with 2 sets of enhanced purification measures(each comprising a 30-meter vegetation zone and one permeable dam);Ditch 2(ED2,186 m)incorporated 5 sets of such measures to form an intensified treatment system;Ditch 3(ED3,193 m)served as the control group without modifications.Through comparative analysis of pollutant interception efficiencies across treatment levels,this study investigates the relationship between ecological ditch construction scale and purification performance,aiming to identify appropriate configuration scales compatible with farmland areas.The results showed that the ecological ditch with enhanced purification measures was significantly better than the ecological ditch without such measures(P＜0.05).Among them,ED2 with five sets of enhanced purification measures exhibited the optimal purification efficiency.The average reduction rates of total N(TN),NO3--N,NH4+-N,total P(TP),chemical oxygen demand(COD)and suspended solids(SS)by ED2 were 41.54％,37.32％,26.72％,31.19％,54.67％,63.56％,respectively.The average reduction of TN and TP pollution flux by ED2 was 652.62 g·d-1 and 28.19 g·d-1,respectively.The growth performance of Iris pseudacorus and Pontederia cordata is better than that of Vallisneria natans,and their contribution to purifying nitrogen and phosphorus in paddy field backwater is more significant.Under the condition of natural rainfall,in order to ensure that TN and TP in the ditch effluent met the standard of surface water,the length of ED2 in the three ditches was the shortest,which was 9.79 m and 11.51 m respectively.The average flow rate of 667 m2 paddy field is about 7.93 m3·d-1,and the average concentrations of TN and TP in farmland backwater are 6.33 mg·L-1 and 0.62 mg·L-1,respectively.The effluent was required to meet the class V standard of surface water.According to the configuration scale of ED2 ditch,1 m2 ecological ditch can treat about 39 m2 farmland backwater,that is,1 m3 ecological ditch can treat about 12 m3 farmland backwater.Therefore,subsequent studies should focus on rationally determining the configuration scale of ecological ditches based on regional characteristics,constructing dynamic quantitative models with adaptive parameters,and collaboratively optimizing the scale ratio of the"field-ditch-pond"system.关键词
生态沟渠/稻田径流/氮/磷/配置规模Key words
ecological ditches/paddy field runoff/nitrogen/phosphorus/configuration scale分类
资源环境引用本文复制引用
潘吴意,张迎颖,张志勇,龚新羽,闻学政,王岩,姜智绘,刘海琴,宋雪飞..生态沟渠对太湖流域稻田径流的净化效能及其配置规模[J].农业环境科学学报,2025,44(8):2009-2022,14.基金项目
江苏省重点研发计划项目(D21YFD17008) （D21YFD17008）
国家重点研发计划项目(2021YFD1700805-02) （2021YFD1700805-02）
国家重大科技专项水体污染控制与治理专项(2017ZX07202004-07)Key Research and Development Program of Jiangsu Province,China(D21YFD17008) （2017ZX07202004-07）
National Key Research and Development Program of China(2021YFD1700805-02) （2021YFD1700805-02）
National Science and Technology Major Project of Water Pollution Control and Treatment(2017ZX07202004-07) （2017ZX07202004-07）
