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引用本文:陈乐,周永强,周起超,李凯迪,张运林,赵玉伟,陆轶峰,常军军.抚仙湖有色可溶性有机物的来源组成与时空变化.湖泊科学,2019,31(5):1357-1367. DOI:
CHEN Le,ZHOU Yongqiang,ZHOU Qichao,LI Kaidi,ZHANG Yunlin,ZHAO Yuwei,LU Yifeng,CHANG Junjun.Sources, composition and spatiotemporal variations of chromophoric dissolved organic matter in a deep oligotrophic Lake Fuxian, China. J. Lake Sci.2019,31(5):1357-1367. DOI:
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抚仙湖有色可溶性有机物的来源组成与时空变化
陈乐1,2, 周永强3, 周起超2,4, 李凯迪2,5, 张运林3, 赵玉伟6, 陆轶峰5, 常军军5
1.云南大学国际河流与生态安全研究院, 昆明 650500;2.云南省环境科学研究院云南省高原湖泊流域污染过程与管理重点实验室, 昆明 650034;3.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;4.云南大学资源环境与地球科学学院/高原湖泊生态与治理研究院, 昆明 650500;5.云南大学生态学与环境学院, 昆明 650500;6.玉溪市抚仙湖管理局, 玉溪 653100
摘要:
基于2017年1-12月在抚仙湖开展的逐月观测,利用紫外-可见吸收光谱和三维荧光光谱技术探讨该湖有色可溶性有机物(CDOM)的来源组成及时空变化特征.12个月CDOM吸收值a(254)的均值为3.47±0.57 m-1,范围为1.82~5.22 m-1,说明CDOM丰度较低.平行因子分析结果给出了2种类酪氨酸荧光组分(C1和C3)、1种类色氨酸荧光组分(C2)、1种类腐殖质荧光组分(C4),12个月内源组分(C1+C3)对总荧光强度的平均贡献为65.81%±15.38%,外源组分(C2+C4)的平均贡献为34.19%±15.38%;荧光指数FI的均值为1.73±0.14,腐殖化指数HIX的均值为1.02±0.37,生源化指数BIX的均值为1.23±0.27,说明CDOM主要为微生物内源产生.时空变化方面,春(3-5月)、夏(6-8月)、秋(9-11月)和冬(1、2、12月)季的a(254)分别为3.20±0.47、3.76±0.64、3.67±0.50和3.23±0.38 m-1,夏季和秋季均显著高于冬季和春季;CDOM丰度及内外源组分的空间分布具有季节异质性,可能与流域土地利用、河流输入、降雨、温度、光辐射等因素有关.
关键词:  有色可溶性有机物  紫外-可见吸收光谱  三维荧光光谱  平行因子分析  云南高原  抚仙湖
DOI:
分类号:
基金项目:云南省科技计划项目(2016RA081,2017FD029)、国家自然科学基金项目(41601208,41621002)和云南省环境科学研究院创新团队计划项目联合资助.
Sources, composition and spatiotemporal variations of chromophoric dissolved organic matter in a deep oligotrophic Lake Fuxian, China
CHEN Le1,2, ZHOU Yongqiang3, ZHOU Qichao2,4, LI Kaidi2,5, ZHANG Yunlin3, ZHAO Yuwei6, LU Yifeng5, CHANG Junjun5
1.Institute of International River and Eco-security, Yunnan University, Kunming 650500, P. R. China;2.Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Institute of Environmental Science, Kunming 650034, P. R. China;3.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;4.Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Resource Environment and Earth Science, Yunnan University, Kunming 650500, P. R. China;5.School of Ecology and Environmental Science, Yunnan University, Kunming 650500, P. R. China;6.Yuxi Fuxian Lake Administration, Yuxi 653100, P. R. China
Abstract:
Lakes are important in terrestrial carbon cycling. Source and optical composition of chromophoric dissolved organic matter (CDOM) in oligotrophic and deep lakes can display distinct properties, because of deep light penetration and long water residence time in these lakes. In this study, the optical properties and spatiotemporal distributions of CDOM were analyzed through monthly field investigation in 2017 in Lake Fuxian, an oligotrophic deep lake in Yunnan Province, China. The results showed that the average value of a(254) was 3.47±0.57 m-1, with the range of 1.82-5.22 m-1, indicating that CDOM abundance in the lake was relatively low compared with other mesotrophic and eutrophic lakes. Moreover, parallel factor analysis was performed to assess CDOM composition from excitation-emission matrix spectra and four components were identified:two tyrosine-like components (C1 and C3), one tryptophan-like component (C2) and one humic-like component (C4). The percentage of fluorescent intensity of C1+C3 was 65.81%±15.38%, and the proportion of C2+C4 was 34.19%±15.38%. The fluorescence index (FI), humification index (HIX) and biological/autochthonous index (BIX) was 1.73±0.14, 1.02±0.37 and 1.23±0.27, respectively. These results demonstrated that the CDOM was primarily originated from endogenous microbes in this lake. The average values of a(254) in spring (March-May), summer (June-August), autumn (September-November) and winter (January, February and December) were 3.20±0.47, 3.76±0.64, 3.67±0.50 and 3.23±0.38 m-1 respectively, with significantly higher values in summer and autumn than those in winter and spring. The abundance and spatial distributions of autochthonous and allochthonous CDOM exhibited seasonal heterogeneity, which might be correlated with land-use pattern, input of terrestrial materials, rainfall, water temperature and irradiance.
Key words:  Chromophoric dissolved organic matter (CDOM)  UV-visible spectroscopy  fluorescence spectroscopy  parallel factor analysis (PARAFAC)  Yunnan Plateau  Lake Fuxian
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