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| Research on the engineering interception effectiveness of ditch-pond systems for non-point source pollutants |
| Received:October 18, 2024 |
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| KeyWord:control of agricultural non-point source pollution;engineering application;pollutant load reduction;water quality improvement |
| Author Name | Affiliation | E-mail | | ZHANG Yuqing | College of Resources and Environment, China Agricultural University, Beijing 100091, China | | | DUAN Jingjing | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | HOU Yong | College of Resources and Environment, China Agricultural University, Beijing 100091, China | | | XU Jiuliang | College of Resources and Environment, China Agricultural University, Beijing 100091, China | | | XUE Lihong | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XU Wen | College of Resources and Environment, China Agricultural University, Beijing 100091, China | wenxu@cau.edu.cn | | YANG Linzhang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | lzyang@issas.ac.cn |
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| 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. |
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