中文关键词城市河流公园湖泊水库有色可溶性有机物(CDOM)平行因子分析(PARAFAC)长春市 英文关键词urban riverpark lakereservoirchromophoric dissolved organic matter (CDOM)parallel factor analysis (PARAFAC)Changchun City

作者	单位	E-mail
俞晓琴	湖南师范大学地理科学学院, 长沙 410081 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008	yuxqlake@163.com
崔扬	中国电力工程顾问集团东北电力设计院有限公司, 长春 130021
陈慧敏	湖南师范大学地理科学学院, 长沙 410081 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
朱俊羽	中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
李宇阳	中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
郭燕妮	中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
周永强	中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
韩龙飞	湖南师范大学地理科学学院, 长沙 410081	hanlf@hunnu.edu.cn

中文摘要 过去几十年里，我国飞速的工业活动和城市化进程对城市地表水体生态系统产生巨大影响，地表水体水质变化直接影响城市居民用水安全、城市景观维护及城市热点区域碳循环过程.通过2020年6月采集长春市各类水体（城市河流、公园湖泊及水库）共50个样品，结合光谱吸收及三维荧光光谱-平行因子分析法（EEMs-PARAFAC）分析了各类水体的有色可溶性有机物（CDOM）光学特性、组成特征及潜在来源.结果表明，长春市城市河流DOC浓度显著高于水库水体（t-test，P<0.05）.城市河流水体的CDOM吸收系数a₂₅₄均值显著大于公园湖泊和水库（t-test，P<0.05），表明城市河流水体中CDOM浓度最高.CDOM光谱吸收斜率S_275-295与光谱吸收斜率比S_R均值均表现为公园湖泊>水库>城市河流（t-test，P<0.001）.平行因子分析法解析三维荧光光谱得到3个荧光组分，陆源类腐殖酸C1（E_x=260 nm，E_m=452 nm）、微生物作用类腐殖酸C2（E_x=245/290 nm，E_m=388 nm）和类色氨酸C3（E_x=275 nm，E_m=340 nm）.城市河流水体各组分荧光强度均值均显著高于公园湖泊与水库（t-test，P<0.005），水库水体陆源类腐殖酸C1荧光强度均值显著高于微生物作用类腐殖酸C2和类色氨酸C3（t-test，P<0.005），城市居民生活污水排放对长春市城市水体，尤其是城市河道中有机碳贡献较大，且该部分有机质中微生物降解潜力强的类蛋白组分贡献率高.因此，应加强城市污水排放管控以有效保障长春市城市水体经济、环境与生态功能的发挥. 英文摘要 In the past few decades, China's rapid industrial activities and urbanization processes have greatly impacted the urban surface water ecosystem. The changes in the quality of urban surface water directly affect the supply and carbon cycling of urban waters. We collected 50 water samples from urban rivers, lakes, and reservoirs in the city of Changchun in June 2020. Three-dimensional fluorescence spectroscopy coupled with parallel factor analysis (EEMs-PARAFAC) was used to unravel the optical characteristics, composition, and sources of chromophoric dissolved organic matter (CDOM). Our results indicated that the mean concentration of DOC is significantly higher in urban rivers than in reservoirs (t-test, P<0.05), and the mean UV absorption coefficient of CDOM a₂₅₄ of urban rivers is significantly larger than that of park lakes and reservoirs (t-test, P<0.05), indicating that urban rivers have the highest concentration of CDOM. The spectral slope of CDOM absorption S_275-295 and the spectral slope ratio S_R were shown to be higher in park lakes than in reservoirs, and even higher than in urban rivers (t-test, P<0.001). Three fluorescent components were obtained using PARAFAC, namely terrestrial human-like (C1), microbial human-like (C2) and tryptophan-like (C3) components. The mean fluorescence intensity of C1-C3 was significantly higher in urban rivers than in both the park lakes and reservoirs (t-test, P<0.005), and the mean fluorescence intensity of C1 in the reservoir water body was significantly higher than that of C2 and C3 (t-test, P<0.005), indicating that the discharge of municipal wastewater likely contributes significantly to the CDOM pool of urban rivers in Changchun, and the contribution percentages of highly bio-labile protein-like components to the CDOM pool in these waters are high. Urban wastewater treatment should be strengthened to effectively protect water quality, as well as the economic, environmental, and ecological functions of urban waters in Changchun City.

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