农业环境科学学报2025，Vol.44Issue(8)：2033-2042,10.DOI:10.11654/jaes.2025-0508
丘陵坡度对生态沟渠磷消纳的影响及优化策略
Impact of hilly slope gradient on phosphorus removal in ecological ditches and optimization strategies
摘要
Abstract
To investigate the impact of hilly slope gradient on phosphorus(P)removal efficiency in ecological ditches,this study evaluated P removal mechanisms and efficiencies under different slope conditions through simulated ditch experiments combined with field validation.In the simulation experiment,two slope gradients(0° and 6°)and two types of ditches(conventional ditches and ecological ditches)were set.The concentrations of different P components in the overlying water(total phosphorus,TP;dissolved total phosphorus,DTP;dissolved inorganic phosphorus,DIP;dissolved organic phosphorus,DOP;and particulate phosphorus,PP)within 24 hours and the changes in the phosphorus forms in the sediment before and after the experiment were monitored.The results showed that the removal rates of TP,DTP,and PP in ecological ditches were significantly higher than those in conventional ditches under both slope gradients.The 6° slope reduced the TP removal rate in ecological ditches by 15.34％compared to 0°,indicating that an increase in slope had a significant inhibitory effect on P removal.The ditch system primarily removed P in water by accumulating labile P fractions(e.g.,NaOH-P)in the sediment.The field ditch experiment in Tangshan,Nanjing(approximately 7° slope planted with Acorns gramineus and volcanic rock substrate)verified the actual efficiency of hilly ecological ditches.The 50 m ecological ditch showed an average TP removal rate of 18.06％and a removal load of 29.81 g·d-1.This study confirmed that slope gradient is one of the critical factors influencing P removal performance of hilly ecological ditches.Nevertheless,optimizing ditch structure,substrate materials,and vegetation selection can enhance the application potential of ecological ditches for controlling agricultural non-point source P pollution in hilly areas.关键词
面源污染/磷/沿程消纳/生态沟渠/丘陵/坡度Key words
non-point source pollution/phosphorus/removal along the way/ecological ditch/hilly area/slope gradient分类
资源环境引用本文复制引用
吴陈晨,徐轩,段婧婧,陈小锋,薛利红..丘陵坡度对生态沟渠磷消纳的影响及优化策略[J].农业环境科学学报,2025,44(8):2033-2042,10.基金项目
国家重点研发计划项目(2023YFD1702103,2021YFD1700803)National Key Research and Development Program of China(2023YFD1702103,2021YFD1700803) （2023YFD1702103,2021YFD1700803）
