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不同丰枯情景下长江三角洲非通江湖群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, 周永强1, 张运林1, 黄昌春3
1.中国科学院南京地理与湖泊研究所;2.南京师范大学;3.南京南京师范大学
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CDOM库来源和组成具有差异性。本文选取了三个重要的中型非通江供水湖泊—滆湖、淀山湖和阳澄湖,对枯、平、丰三个水文情景下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。利用平行因子分析法得到2种类腐殖质和2种类蛋白质,降雨事件和人类活动共同影响着湖泊CDOM结构。结果表明:三个湖泊的类蛋白质在空间上其高值均分布在人类活动频繁的湖区,并且类蛋白物质与Chla相关性较差,说明湖泊类蛋白质组分受到内源藻类降解和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TN浓度均在枯水期显著高于丰水期(t-test, p < 0.05),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DOC浓度 (r2 = 0.16)、TN浓度(r2 = 0.27)、TP浓度(r2 = 0.27)、Chla浓度(r2 = 0.27)显著正相关(p < 0.01),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,携带更多的陆源腐殖程度高的有机质进入湖泊。本研究发现降雨过程和人类活动共同作用着滆湖、淀山湖和阳澄湖CDOM库,研究结果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  溶解有机物  光学性质  平行因子分析  人类活动
DOI:
分类号:
基金项目:国家自然科学(41807362, 41807163, 41621002);江苏省自然科学(BK20181104);中国科学院前沿科学重点研究计划项目(QYZDB-SSW-DQC016);中国科学院南京湖泊地理研究所启动(NIGLAS2017QD08)
Characterizing Chromophoric Dissolved Organic Matter in the Lake Gehu, Lake Dianshan and Lake Yangcheng in the Different Hydrological Seasons
Shi Yu1,2, Li Yuanpeng, Zhang Liuqing, Guo Yanni, Zhou Lei, Zhou Yongqiang3, Zhang Yunlin, Huang Changchun
1.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Science;2.College of Geography Science, Nanjing Normal University.;3.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Science.
Abstract:
Most lakes in the Yangtze River Delta are not directly connecting to the mainstem of the river, and are characterized by low and flat terrain, poor water exchange, long water retention time, and with dense towns and population in the surrounding areas. Therefore, compared with lakes connecting to the mainstem that have short water retention times, the source and composition of CDOM and the associated driving factors in these lakes are different. In this study, we selected three important medium-sized lakes that not directly connecting to the mainstem of the Yangtze River, Lake Gehu, Lake Dianshan and Lake Yangcheng, to analyze the characteristics of CDOM composition change in 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 all observed in lake areas with surrounding high urban land use, and the r2 of linear fittings of correlation between the protein-like materials and Chla concentration were low, indicating that the protein-like components were affected by both the degradation of endogenous algae and the anthropogenic effluents . The mean of Fmax of protein-like components and TN concentration in the three lakes were significantly higher in dry season than in wet season (t-test, p < 0.05), indicating that increased rainfall can dilute the concentration of DOM in these lakes. Significant positive correlations were recorded between humic-like materials and DOC (r2 = 0.16), TN (r2 = 0.27), TP (r2 = 0.27), Chla (r2 = 0.27)(p < 0.01). Meanwhile, with increasing rainfall, the proportion of protein-like materials decreased gradually, such as Lake Gehu decreased from 86.84% to 62.49%, Lake Dianshan decreased from 96.53% to 90.56%, Lake Yangcheng decreased from 98.40% to 96.26%, indicating that rainfall events could also enhance the soil erosion and discharge more soil organic-rich substances into the lakes. This study found that rainfall events and human activities altogether acted on the CDOM dynamics in the three lakes, and enriches the research data on CDOM in these lakes and improve our knowledge on making advanced schemes for the protection of water supply security in the Lake Taihu Basin.
Key words:  Lake Taihu Basin  dissolved organic matter  optical characteristics  parallel factor analysis (PARAFAC)  human activities
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