| 引用本文: | 李玲玲,闫人华.滨湖城市河网N2O溶存浓度、空间分布及对生态修复的响应.湖泊科学,2024,36(5):1412-1424. DOI:10.18307/2024.0522 |
| Li Lingling,Yan Renhua.Concentration, spatial distribution, and response to ecological restoration of N2O in urban river networks of lakeside city. J. Lake Sci.2024,36(5):1412-1424. DOI:10.18307/2024.0522 |
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| 摘要: |
| 随着快速城市化人为氮输入强度的增加,城市河流生态系统逐渐成为大气N2O的重要排放源。目前,针对滨湖城市典型河网N2O的监测和影响因素的分析仍然不足,特别是缺乏量化评估其对目前普遍开展的水生态修复工程的响应研究。本研究选取无锡市滨湖区为典型滨湖城市河网区,揭示了城市河网溶存N2O的空间分布及影响因素,阐明了其对生态修复的响应变化特点。结果表明:(1)滨湖城市河网溶存N2O浓度具有较大的空间变异性,低值区主要位于入湖河口区及生态修复后水质改善明显的河段;(2) N2O浓度主要受到河流溶解态氮,尤其是硝态氮的影响;(3)河网水质及溶存N2O浓度受到人类活动的污染排放及生态修复的水质改善效应双重影响,重污染河段的生态修复可同时达到营养盐去除和N2O减排的目的。 |
| 关键词: 温室气体 城市河网 生态修复 人类活动 |
| DOI：10.18307/2024.0522 |
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| 基金项目:国家重点研发计划项目(2023YFC3208704)、国家自然科学基金项目(42001091, 41842049, 42371043, 42071052)和中国科学院南京地理与湖泊研究所自主部署科研项目(NIGLAS2022GS10) 联合资助。 |
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| Concentration, spatial distribution, and response to ecological restoration of N2O in urban river networks of lakeside city |
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Li Lingling1, Yan Renhua2
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1.College of Geography Science, Jiangsu Second Normal University, Nanjing 211200, P. R. China;2.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China
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| Abstract: |
| With the increasing anthropogenic nitrogen input, urban river ecosystem has become an important source of atmospheric N2O. However, there is still insufficient analysis on the monitoring and influencing factors of N2O in typical river networks of lakeside city, especially for the quantitative evaluation of their response to the current widespread water ecological restoration projects. We chose the Binhu District of Wuxi City as a typical area to study the spatial distribution pattern and influencing factors of N2O dissolved in the urban river network, and to elucidate its response to ecological restoration. Results showed that: (1) the N2O concentration in urban river network of lakeside city had significant spatial variability, with low value areas mainly located in the estuary area of the lake and in the river sections where water quality has significantly improved after ecological restoration; (2) The concentration of N2O was mainly affected by dissolved nitrogen in rivers, especially nitrate nitrogen; (3) The water quality and dissolved N2O concentration in river networks were affected by the dual effects of human pollution emissions and ecological restoration on water quality improvement. The ecological restoration of heavily polluted river sections could achieve both nutrient removal and N2O emission reduction. |
| Key words: Greenhouse gas urban river network ecological restoration human activities |
