| 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，但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的双重影响，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: 温室气体排放 城市河网 硝化过程 生态修复 |
| DOI： |
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| Concentration, Spatial distribution, and ecological restoration response of N2O in lakeside urban river networks |
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Li Lingling1, Yan2
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1.: College of Geography Science,Nanjing Normal University;2.Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences
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| Abstract: |
| With the increasing intensity of 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 cities, 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, studied the spatial distribution pattern and influencing factors of N2O dissolved in the urban river network, and elucidating its response to ecological restoration. The results showed that: (1) the N2O concentration in urban river network of lakeside cities 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 is mainly affected by dissolved nitrogen in rivers, especially nitrate nitrogen; (3) The water quality and dissolved N2O concentration in river networks are 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 |
