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| Mechanism of iron-biochar-based ecological ditches purifying farmland water and enhancing N2O sinks |
| Received:March 29, 2025 |
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| KeyWord:sponge iron;biochar;ecological ditch;denitrification;net N2O sink;Myriophyllum |
| Author Name | Affiliation | E-mail | | YANG Yijing | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs
Liuhe Observation and Experimental Station of National Agricultural Environment, Nanjing 210014, China
School of the Environment, Nanjing Normal University, Nanjing 210023, China | | | JIANG Bini | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs
Liuhe Observation and Experimental Station of National Agricultural Environment, Nanjing 210014, China
School of the Environment, Nanjing Normal University, Nanjing 210023, China | | | ZHANG Yingying | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs
Liuhe Observation and Experimental Station of National Agricultural Environment, Nanjing 210014, China | | | WANG Yan | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs
Liuhe Observation and Experimental Station of National Agricultural Environment, Nanjing 210014, China | | | ZHANG Zhiyong | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs
Liuhe Observation and Experimental Station of National Agricultural Environment, Nanjing 210014, China
School of the Environment, Nanjing Normal University, Nanjing 210023, China | jaaszyzhang@126.com | | LIU Haiqin | Institute of Agricultural Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences
Key Laboratory of AgroEnvironment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs
Liuhe Observation and Experimental Station of National Agricultural Environment, Nanjing 210014, China | | | LI Dian | School of the Environment, Nanjing Normal University, Nanjing 210023, China | | | HE Xiwei | School of the Environment, Nanjing Normal University, Nanjing 210023, China | | | YANG Yuli | School of the Environment, Nanjing Normal University, Nanjing 210023, China | ylyang@njnu.edu.cn |
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| Abstract: |
| In order to explore the nitrogen removal effect and N2O emission of sponge iron-Myriophyllum（iron-M）verticillatum derived biochar-based ecological ditch in the face of farmland dewatering formed under rainstorm conditions. In this study, six pilot-scale iron-M. algae derived biochar-based ecological ditch simulation systems were constructed to explore the effects of sponge iron coupled with powdered and granular biochar-based ecological ditches on nitrogen removal and N2O sink function of farmland with different carbonnitrogen ratios. The results showed that compared with the iron-free biochar ecological ditch（CK）, the addition of sponge iron-biochar could improve the removal rate of total nitrogen（TN）. Among them, powdered carbon could significantly enhance the N2O-N sink of the system and transform the ditch from an atmospheric N2O emission source to a net absorption sink. When the chemical oxygen demand （COD）/TN=30/5, the TN removal rate of the sponge iron-powder biochar-based ecological ditch was as high as 40.06%, and the N2O-N absorption rate was 2.59 μg· m-2·h-1, which was significantly higher than that of the ecological ditch without adding and adding sponge iron-particle biochar. The NO-3-N removal rate in the ecological ditches was the main contributor to the TN removal rate, and the N2O emission flux was significantly negatively correlated with the dissolved organic carbon concentration, COD and total organic carbon（TOC） removal rate. The TN absorbed by the two aquatic plants further explained the biological driving mechanism of simultaneous enhancement of denitrification and N2O sink in iron-powder biochar-based ecological ditches. The results showed that the iron-M. verticillata derived powder biochar-based ecological ditch had a good effect on the treatment of farmland drainage formed by rainstorm conditions and could form a net N2O absorption sink together with plants. |
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