Sources, composition and spatiotemporal variations of chromophoric dissolved organic matter in a deep oligotrophic Lake Fuxian, China

被引：1

作者：

Chen L. ^{[1
,2
]}

Zhou Y. ^{[3
]}

Zhou Q. ^{[2
,4
]}

Li K. ^{[2
,5
]}

Zhang Y. ^{[3
]}

Zhao Y. ^{[6
]}

Lu Y. ^{[5
]}

Chang J. ^{[5
]}

机构：

[1] Institute of International River and Eco-security, Yunnan University, Kunming

[2] Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Institute of Environmental Science, Kunming

[3] State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing

[4] Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Resource Environment and Earth Science, Yunnan University, Kunming

[5] School of Ecology and Environmental Science, Yunnan University, Kunming

[6] Yuxi Fuxian Lake Administration, Yuxi

来源：

Hupo Kexue/Journal of Lake Sciences | 2019年 / 31卷 / 05期

关键词：

Chromophoric dissolved organic matter (CDOM); Fluorescence spectroscopy; Lake Fuxian; Parallel factor analysis (PARAFAC); UV-visible spectroscopy; Yunnan Plateau;

D O I：

10.18307/2019.0525

中图分类号：

学科分类号：

摘要：

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. © 2019 by Journal of Lake Sciences.

引用

页码：1357 / 1367

页数：10

共 48 条

[1] Zhang Y., Zhang E., Yin Y., Et al., Characteristics and sources of chromophoric dissolved organic matter in lakes of the Yungui Plateau, China, differing in trophic state and altitude, Limnology and Oceanography, 55, 6, pp. 2645-2659, (2010)
[2] Yao X., Zhang Y., Zhu G., Et al., Resolving the variability of CDOM fluorescence to differentiate the sources and fate of DOM in Lake Taihu and its tributaries, Chemosphere, 82, 2, pp. 145-155, (2011)
[3] Coble A.A., Marcarelli A.M., Kane E.S., Ammonium and glucose amendments stimulate dissolved organic matter mineralization in a Lake Superior tributary, Journal of Great Lakes Research, 41, 3, pp. 801-807, (2015)
[4] Shang P., Lu Y., Du Y., Et al., Climatic and watershed controls of dissolved organic matter variation in streams across a gradient of agricultural land use, Science of the Total Environment, 612, pp. 1442-1453, (2018)
[5] Cole J.J., Prairie Y.T., Caraco N.F., Et al., Plumbing the global carbon cycle: Integrating inland waters into the terrestrial carbon budget, Ecosystems, 10, 1, pp. 171-184, (2007)
[6] Tranvik L.J., Downing J.A., Cotner J.B., Et al., Lakes and reservoirs as regulators of carbon cycling and climate, Limnology and Oceanography, 54, 6, pp. 2298-2314, (2009)
[7] Helms J.R., Stubbins A., Ritchie J.D., Et al., Absorption spectral slopes and slope ratios as indicators of molecular weight, source, and photobleaching of chromophoric dissolved organic matter, Limnology and Oceanography, 53, 3, pp. 955-969, (2008)
[8] Zhang Y., Gao G., Shi K., Et al., Absorption and fluorescence characteristics of rainwater CDOM and contribution to Lake Taihu, China, Atmospheric Environment, 98, pp. 483-491, (2014)
[9] Zhou Y., Zhang Y., Shi K., Et al., Dynamics of chromophoric dissolved organic matter influenced by hydrological conditions in a large, shallow, and eutrophic lake in China, Environmental Science and Pollution Research, 22, 17, pp. 12992-13003, (2015)
[10] Lu Y.H., Bauer J.E., Canuel E.A., Et al., Effects of land use on sources and ages of inorganic and organic carbon in temperate headwater streams, Biogeochemistry, 119, 1-3, pp. 275-292, (2014)

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