Differences in the distribution and optical properties of DOM between fresh and saline lakes in a semi-arid area of Northern China

Wen, Zhidan; Song, Kaishan; Shang, Yingxin; Zhao, Ying; Fang, Chong; Lyu, Lili

doi:10.1007/s00027-018-0572-5

Cited by 28 publications

(12 citation statements)

References 59 publications

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“…Moreover, our results suggest that the proportion of terrigenous DOC in saline waters was lower than that of the freshwater lakes. The diversity of hydrogeological conditions, longer residence time of DOM and the photo-degradation of DOM in saline waters could significantly contribute to the variability of CDOM absorption and composition (Spencer et al, 2012;Song et al, 2013;Wen et al, 2018).…”

Section: Cdom Sources For Saline and Freshwatersmentioning

confidence: 99%

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Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis

et al. 2019

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China were examined to determine relationships between lake water sources (fresh versus saline) and their fluorescence/absorption characteristics. Results indicated significant differences regarding DOC concentration and a CDOM (254) between freshwater (6.68 mg C L-1 , 19.55 m-1) and saline lakes (27.4 mg C L-1 , 41.17 m-1). While humic-like (F 5) and fulvic-like (F 3) compounds contributed to CDOM fluorescence in all lake waters significantly, their contribution to total fluorescence intensity (F T) differed between saline and freshwater lakes. Significant negative relationships were also observed between lake altitude with either F 5 (R 2 =0.63, N=306) or F T (R 2 =0.64, N=306), suggesting that the abundance of humic-like materials in CDOM tends to decrease with increased in lakes altitude. In high-altitude lakes, strong solar irradiance and UV exposure may have induced photo-oxidation reactions resulting in decreased abundance of humic-like substances and the formation of low molecular weight compounds. These findings have important implications regarding our understanding of C dynamics in lacustrine systems and the contribution of these ecosystems to the global C cycle.

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Section: Cdom Sources For Saline and Freshwatersmentioning

confidence: 99%

“…CDOM is a complex mixture of organic constituents, the composition of which is difficult to elucidate. Spectrophotometry and three-dimensional excitation-emission matrix spectra (EEMs) have provided useful information about CDOM composition, sources, and molecular size (Liu et al, 2007;Wang et al, 2007;Wen et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis

et al. 2019

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“…Dissolved organic matter (DOM) is widely found in rivers, lakes, and other natural water bodies and it is considered to be the largest pool of organic matter that occurs in natural waters. As an important and active chemical component in terrestrial and aquatic ecosystems, DOM plays an important role in aquatic ecosystems and is of great significance in the biogeochemical cycle of biogenic elements, such as carbon, nitrogen, and phosphorus, in water bodies [1][2][3]. In recent years, studies have found a general increase in the concentration of dissolved organic carbon (DOC) in surface waters in eastern North America and northern and central Europe.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Source of Dissolved Organic Matter in Lake Hulun, A Large Shallow Eutrophic Steppe Lake in Northern China

Wang

Zheng

Xia

et al. 2020

Water

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Lake Hulun, the fifth largest lake in China, is a typical eutrophic steppe lake located in the Hulun Buir Prairie. The dissolved organic matter (DOM) in the water of Lake Hulun has a high concentration. However, little is known about the occurrence characteristics and source of the DOM in Lake Hulun. The spatial and temporal distribution characteristics of DOM concentration in Lake Hulun were thoroughly surveyed, and the optical characteristics, fluorescence components and sources of DOM were analyzed by excitation emission matrix (EMM) and parallel factor analysis (PARAFAC) technology. The DOM concentration was 6.46–42.87 mg C/L, and was highest in summer and lowest in winter. The difference in the spatial distribution of DOM in winter was significant due to the ice over, and showed a trend where the concentration near the shore was higher than that in the center of the lake. Three humic-like components and one component consisting of a mixture of humic-like and protein-like substances of DOM were identified, with the former being prevalent. The humification index of DOM was 2.22–9.92, indicating that the DOM has a high degree of humification. The DOM is mainly derived from terrestrial sources, with the highest proportion (91.0% ± 8.1%) found in winter and the lowest (66.2% ± 7.7%) in summer. Given that the DOM in Lake Hulun is mainly dominated by humic-like components with a high degree humification, the DOM may have low bioactivity. However, this is just a preliminary analysis and judgment, and it is necessary to conduct other experiments such as biodegradation experiments to further study the bioavailability of DOM in Lake Hulun.

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“…Environmental and limnological factors, e.g., temperature,-precipitation, lake type, and trophic level, have a major influence on the transport, transformation and storage of DOC in a body of water (Arts et al, 2000;Duarte et al, 2008;Gudasz et al, 2010;Weyhenmeyer et al, 2016;Wen et al, 2018). Previous studies have demonstrated that the DOC in inland waters tends to decrease as the duration time for the water increases because of increased photochemical processes and microbial consumption and decomposition (Hanson et al, 2011;Kellerman et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Dissolved carbon in a large variety of lakes across five limnetic regions in China

Song

Wen

et al. 2018

Journal of Hydrology

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Dissolved carbon in lakes play a vital role in the global carbon cycling. The concentration and dynamics of lake dissolved carbon can be influenced by both the surrounding landscape and a combination of physical, chemical and biological processes within the lakes themselves. From 2009 to 2016, we conducted a large-scale assessment of dissolved organic carbon (DOC) and dissolved inorganic carbon (DIC) in 249 lakes across a diverse range of climatic, geopedologic, topographical and hydrological conditions in five Chinese limnetic regions: the East Limnetic Region (ELR), the Northeast Limnetic Region (NLR), the Inner Mongolia-Xinjiang Limnetic Region (MXR), the Yungui Limnetic Region (YGR), and the Tibet-Qinghai Limnetic Region (TQR). We found that the density of the organic matter in the soil in the surrounding landscape plays an important role in the DOC and DIC in lake water, as was evidenced by the high DOC and DIC levels in the NLR, where the soil is respectively organically rich. Conditions in the arid and semi-arid environments (i.e. TQR and MXR) have created a number of brackish/saline lakes and here we found that, DOC and DIC levels (median: 21.79 and 93.72 mg/L, respectively) are significantly higher than those in the freshwater lakes (median: 5.80 and 29.38 mg/L). It also appears to be the case that the trophic state of freshwater lakes influences the spatial variation of DOC. This can be seen in the relationships between DOC and trophic state index (TSI) in agriculturallydominated regions such as the ELR (R 2 = 0.59, p < 0.01), NLR (R 2 = 0.65, p < 0.001), and YGR (R 2 = 0.78, p < 0.001). Additionally, a close relationship between DOC and DIC can be found in lake waters with different trophic states (eutrophic: slp = 0.63, R 2 = 0.69; mesotrophic: slp = 1.03, R 2 = 0.65; oligotrophic: slp = 1.00, R 2 = 0.64). This indicates that human activities influence the quantity and quality of dissolved carbon in inland water across China. This study is able to provide insights regarding the potential effects of climate change and changes in land-use upon the amount of dissolved carbon in lake water.

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Differences in the distribution and optical properties of DOM between fresh and saline lakes in a semi-arid area of Northern China

Cited by 28 publications

References 59 publications

Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis

Characterization of CDOM in saline and freshwater lakes across China using spectroscopic analysis

Characteristics and Source of Dissolved Organic Matter in Lake Hulun, A Large Shallow Eutrophic Steppe Lake in Northern China

Dissolved carbon in a large variety of lakes across five limnetic regions in China

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