| 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. |
| 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 |
| 投稿时间：2025-05-29 |
| DOI：10.11654/jaes.2025-0508 |
| 中文关键词: 面源污染 磷 沿程消纳 生态沟渠 丘陵 坡度 |
| 英文关键词: non-point source pollution phosphorus removal along the way ecological ditch hilly area slope gradient |
| 基金项目:国家重点研发计划项目（2023YFD1702103，2021YFD1700803） |
| 作者 | 单位 | E-mail | | 吴陈晨 | 扬州大学环境科学与工程学院, 江苏 扬州 225009
江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | | | 徐轩 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | xxu@jaas.ac.cn | | 段婧婧 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | | | 陈小锋 | 扬州大学环境科学与工程学院, 江苏 扬州 225009 | | | 薛利红 | 江苏省农业科学院农业资源与环境研究所, 农业农村部长江下游平原农业环境重点实验室, 南京 210014 | |
|
| 摘要点击次数: 1091 |
| 全文下载次数: 1108 |
| 中文摘要: |
| 为探究丘陵坡度对生态沟渠磷消纳效能的影响，本研究结合模拟沟渠实验与野外原位验证相结合的方法，评估了不同坡度条件下生态沟渠的磷去除机制与效率。模拟实验设置0°与6°两种坡度及常规沟渠与生态沟渠两种类型，监测了24 h内上覆水中不同磷组分[总磷（TP）、溶解态总磷（DTP）、溶解态无机磷（DIP）、溶解态有机磷（DOP）、颗粒态磷（PP）]浓度及实验前后底泥磷形态的变化。结果表明：生态沟渠在两种坡度下对TP、DTP、PP的去除率均显著高于常规沟渠；与0°相比，6°坡度使生态沟渠的TP去除率降低了15.34%，表明坡度增加对磷的去除产生了显著的抑制作用。沟渠系统主要通过促进底泥中活性磷（如NaOH-P）的累积来实现对水体中磷的消纳。南京汤山野外沟渠实验（坡度约7°、种植金钱蒲、铺设火山石）验证了丘陵生态沟渠的实际效能，该50 m长的生态沟渠对TP的平均去除率达到18.06%，去除负荷为29.81 g·d-1。研究表明，坡度是影响丘陵生态沟渠磷消纳性能的关键因素之一，通过优化沟渠结构设计、基质选择与植被配置等策略，可有效提升其在丘陵地区农业面源磷污染控制中的应用潜力。 |
| 英文摘要: |
| 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 Acorus 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. |
| HTML
查看全文
查看/发表评论 下载PDF阅读器 |
|
|
|
