农业环境科学学报2025，Vol.44Issue(8)：2023-2032,10.DOI:10.11654/jaes.2025-0184
基于田间原位监测的稻田排水化学需氧量动态变化及沟道调蓄削减研究
Dynamic changes of chemical oxygen demand in paddy field drainage and reduction of channel storage and storage based on in-situ field monitoring
摘要
Abstract
In order to explore the emission characteristics of non-point chemical oxygen demand(COD)from paddy fields in the southern water network area,a two-year field in-situ monitoring experiment was conducted in the Taihu Lake Bay Cultivation and Reading Base,Wujin District,Changzhou City,Jiangsu Province.Based on experimental data,this study analyzes the water depth,COD dynamic changes,and emission characteristics of paddy ditches throughout the entire growth period,and investigates the COD removal efficiency during the drainage and storage process of the ditches.The results showed that the greening and tillering stages of rice are key periods for non-point source pollution emissions.In 2023,the total drainage of paddy fields and gully connected paddy fields were 4 501.0 m3·hm-2 and 6 754.5 m3·hm-2,respectively.At this time,the drainage and COD emissions of paddy fields significantly increased;Fertilization is the main reason for the increase in COD concentration in paddy fields and ditch water bodies.After applying base fertilizer in 2024,the COD concentration reached 46.2 mg·L-1,and the highest COD concentration reached 81.0 mg·L-1 after fertilization during the jointing stage;The alternating effects of rainfall,irrigation,and drainage result in fluctuating COD concentrations throughout the entire growth period;The average concentration of COD in paddy water throughout the entire growth period is greater than or equal to the average concentration of COD in channel water;The drainage from the paddy field was stored in the ditch and digested for a period of time.The COD reduction rates from three storage experiments were 1.0,0.8,and 2.0 kg·hm-2,respectively.Research has shown that the greening and tillering stages are critical stages for COD emissions in paddy fields,and water quality management during these periods should be given special attention;Fertilization events can significantly increase the COD concentration in water bodies in a short period of time,and the timing and method of fertilization should be reasonably controlled;Channel regulation and storage can effectively reduce COD load by 14.5％to 27.0％,and is an effective means of controlling non-point source pollution in rice fields.关键词
面源污染/化学需氧量/稻田/排水沟/去除率Key words
non-point source pollution/chemical oxygen demand/paddy field/drainage ditch/removal rate分类
资源环境引用本文复制引用
黄昕然,黄增健,李江,缴锡云,郭维华,顾哲,刘凯华..基于田间原位监测的稻田排水化学需氧量动态变化及沟道调蓄削减研究[J].农业环境科学学报,2025,44(8):2023-2032,10.基金项目
国家重点研发计划子课题(2021YFD1700803-02,D21YFD17008) （2021YFD1700803-02,D21YFD17008）
农业水资源高效利用全国重点实验室开放研究基金项目(SKLAWR-2024-10) （SKLAWR-2024-10）
国家自然科学基金项目(52209052)National Key Research and Development Program of China(2021YFD1700803-02,D21YFD17008) （52209052）
Open Research Fund of State Key Laboratory of Efficient Utilization of Agricultural Water Resources(SKLAWR-2024-10) （SKLAWR-2024-10）
National Natural Science Foundation of China(52209052) （52209052）
