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引用本文:石玉,李元鹏,张柳青,郭燕妮,周蕾,周永强,张运林,黄昌春.不同丰枯情景下长江三角洲非通江湖泊(滆湖、淀山湖和阳澄湖)有色可溶性有机物组成特征.湖泊科学,2021,33(1):168-180. DOI:10.18307/2021.0124
Shi Yu,Li Yuanpeng,Zhang Liuqing,Guo Yanni,Zhou Lei,Zhou Yongqiang,Zhang Yunlin,Huang Changchun.Characterizing chromophoric dissolved organic matter in Lake Gehu, Lake Dianshan and Lake Yangcheng in different hydrological seasons. J. Lake Sci.2021,33(1):168-180. DOI:10.18307/2021.0124
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不同丰枯情景下长江三角洲非通江湖泊(滆湖、淀山湖和阳澄湖)有色可溶性有机物组成特征
石玉1,2, 李元鹏1, 张柳青1, 郭燕妮1, 周蕾1,3, 周永强1,3, 张运林1,3, 黄昌春2
1.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;2.南京师范大学地理科学学院, 南京 210023;3.中国科学院大学, 北京 100049
摘要:
长三角地区大部分湖泊为非通江湖泊,地势低平,港汊及闸坝众多,水流宣泄不畅,水力滞留时间较长,加之周边地区城镇人口稠密.因此与水滞留时间短的通江湖泊相比,非通江湖泊的有色可溶性有机物(CDOM)来源和组成具有差异性.本文选取了3个重要的中型非通江供水湖泊——滆湖、淀山湖和阳澄湖,对枯水期、平水期、丰水期3种水文情景下CDOM组成结构变化特征进行分析,从而进一步揭示该类湖泊CDOM来源和对水文情景响应的内在机理.结果表明:滆湖、淀山湖和阳澄湖通过平行因子分析法得到2种类腐殖质(C1和C4)和2种类蛋白质(C2和C3),湖泊CDOM结构受到降雨事件和人类活动的双重影响.三个湖泊类蛋白质的高值在空间上主要集中在人类活动频繁的湖区,并且类蛋白质平均荧光强度与叶绿素a浓度相关性较差,说明湖泊类蛋白质组分受到内源藻类降解、外源人类生产生活排放双重作用的影响.三个湖泊类蛋白质的平均荧光强度和总氮浓度均在枯水期显著高于丰水期,说明降雨量的增加可以稀释湖泊有机质浓度;同时,陆源类腐殖质C1与溶解性有机碳、总氮、总磷、叶绿素a浓度呈显著正相关,并且随着降雨量增加,类蛋白质的占比逐渐降低,滆湖从86.84%降低至62.49%,淀山湖从96.53%降低至90.56%,阳澄湖从98.40%降低至96.26%,说明降雨事件也可以增强径流的冲刷作用,携带更多腐殖化程度高的陆源有机质进入湖泊.本研究发现降雨过程和人类活动共同作用于滆湖、淀山湖和阳澄湖CDOM库,研究结果可以为进一步保障太湖流域人类用水安全提供参考依据.
关键词:  太湖流域  有色可溶性有机物  光学性质  平行因子分析  人类活动  滆湖  淀山湖  阳澄湖
DOI:10.18307/2021.0124
分类号:
基金项目:国家自然科学基金项目(41807362,41807163,41621002)、江苏省自然科学基金项目(BK20181104)、中国科学院前沿科学重点研究计划项目(QYZDB-SSW-DQC016)和中国科学院南京地理与湖泊研究所启动基金项目(NIGLAS2017QD08)联合资助.
Characterizing chromophoric dissolved organic matter in Lake Gehu, Lake Dianshan and Lake Yangcheng in different hydrological seasons
Shi Yu1,2, Li Yuanpeng1, Zhang Liuqing1, Guo Yanni1, Zhou Lei1,3, Zhou Yongqiang1,3, Zhang Yunlin1,3, Huang Changchun2
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;2.College of Geography Science, Nanjing Normal University, Nanjing 210023, P. R. China;3.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
Most lakes in the Yangtze River Delta are not directly connected to the mainstem of the Yangtze River, and are characterized by low and flat terrain, limited water exchange, long water retention time, and with dense towns and population in the surrounding areas. Therefore, those lakes share distinct sources and optical composition of chromophoric dissolved organic matter (CDOM) and associated driving factors compared with lakes connecting to the mainstem that have short water retention time. In this study, we selected three medium-sized yet important lakes that are not directly connected to the mainstem of the Yangtze River, i.e. Lake Gehu, Lake Dianshan and Lake Yangcheng, to analyze the characteristics of optical composition of CDOM under the wet, wet-to-dry transition, and dry hydrological scenarios. Using parallel factor analysis, we obtained two humic-like (C1 and C4) and two protein-like (C2 and C3) components. High fluorescence intensity (Fmax) of protein-like components in the three lakes were observed in all these lake with surrounding high urban land use, and the R2 of linear fittings of correlation between protein-like components and chlorophyll-a concentration were low, indicating that the protein-like components were affected by both algal degradation and anthropogenic effluents. The mean of Fmax of protein-like components and total nitrogen concentration in the three lakes were significantly higher in dry season than in wet season, indicating that increased rainfall can dilute the concentration of dissolved organic substances in these lakes. Significant positive correlations were recorded between humic-like materials and dissolved organic carbon, total nitrogen, total phosphorus, chlorophyll-a. Meanwhile, with increasing rainfall, the contribution percentages of protein-like components decreased from 86.84% to 62.49% in Lake Gehu, and from 96.53% to 90.56% in Lake Dianshan, and from 98.40% to 96.26% in Lake Yangcheng, indicating that rainfall events could also enhance the erosion soil leachates and discharge more soil organic-rich substances into the lakes. We concluded that rainfall events and human activities altogether acted on the CDOM dynamics in the three lakes, and our results enriches the research data on carbon cycling in these lakes and improves our knowledge on making advanced schemes for the protection of water supply security in the Taihu Basin.
Key words:  Taihu Basin  chromophoric dissolved organic matter  optical properties  parallel factor analysis (PARAFAC)  anthropogenic activities  Lake Gehu  Lake Dianshan  Lake Yangcheng
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