| 杨伊婧,蒋碧妮,张迎颖,王岩,张志勇,刘海琴,李典,何席伟,杨玉立.铁-生物炭基生态沟渠净化农田退水及增强N2O汇的机制[J].农业环境科学学报,2025,44(8):2043-2056. |
| 铁-生物炭基生态沟渠净化农田退水及增强N2O汇的机制 |
| Mechanism of iron-biochar-based ecological ditches purifying farmland water and enhancing N2O sinks |
| 投稿时间：2025-03-29 |
| DOI：10.11654/jaes.2025-0304 |
| 中文关键词: 海绵铁 生物炭 生态沟渠 反硝化 净N2O汇 狐尾藻 |
| 英文关键词: sponge iron biochar ecological ditch denitrification net N2O sink Myriophyllum |
| 基金项目:江苏省重点研发计划项目（D21YFD17008）; 国家重点研发计划项目（2021YFD1700805-02） |
| 作者 | 单位 | E-mail | | 杨伊婧 | 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, 国家农业环境六合观测实验站, 南京 210014
南京师范大学环境学院, 南京 210023 | | | 蒋碧妮 | 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, 国家农业环境六合观测实验站, 南京 210014
南京师范大学环境学院, 南京 210023 | | | 张迎颖 | 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, 国家农业环境六合观测实验站, 南京 210014 | | | 王岩 | 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, 国家农业环境六合观测实验站, 南京 210014 | | | 张志勇 | 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, 国家农业环境六合观测实验站, 南京 210014
南京师范大学环境学院, 南京 210023 | jaaszyzhang@126.com | | 刘海琴 | 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, 国家农业环境六合观测实验站, 南京 210014 | | | 李典 | 南京师范大学环境学院, 南京 210023 | | | 何席伟 | 南京师范大学环境学院, 南京 210023 | | | 杨玉立 | 南京师范大学环境学院, 南京 210023 | ylyang@njnu.edu.cn |
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| 中文摘要: |
| 为探究海绵铁-狐尾藻衍生生物炭基生态沟渠在暴雨条件下形成的农田退水的脱氮效果及 N2O排放情况，本研究构建 6条中试规模的铁-粉绿狐尾藻衍生生物炭基生态沟渠模拟系统，探究海绵铁分别耦合粉末状和颗粒状生物炭基生态沟渠对不同碳氮比的农田退水的脱氮效果及N2O汇功能的影响。结果表明，与无添加铁-生物炭生态沟渠（CK）相比，海绵铁-生物炭的加入能够提高总氮（TN）去除率，其中粉末炭能够显著增强系统的N2O-N汇，将沟渠由大气的N2O排放源转变为净吸收汇。当化学需氧量（COD）/TN=30/5时，海绵铁-粉末生物炭基生态沟渠 TN去除率高达 40.06%，N2O-N吸收速率为 2.59 μg· m-2·h-1，显著高于无添加和添加海绵铁-颗粒生物炭的生态沟渠。生态沟渠中NO-3-N去除率是TN去除率的主要贡献者，N2O排放通量与溶解性有机碳浓度、COD和总有机碳的去除率呈显著负相关。狐尾藻和鸢尾两种水生植物吸收的TN进一步解释了铁-粉末生物炭基生态沟渠同步增强反硝化和N2O汇的生物驱动机制。研究表明，铁-狐尾藻衍生粉末态生物炭基生态沟渠处理暴雨条件形成的农田退水效果较好，且其与植物共同作用能够形成N2O净吸收汇。 |
| 英文摘要: |
| 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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