Impact factors of dissolved organic carbon and the transport in a river-lake continuum in the Tibet Plateau of China

Wen, Zhidan; Song, Kaishan; Liu, Ge; Shang, Yingxin; Hou, Junbin; Lyu, Lili; Fang, Chong

doi:10.1016/j.jhydrol.2019.124202

Cited by 34 publications

(10 citation statements)

References 69 publications

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“…The lakes in the TQR in China are located at high altitudes and are mainly supplied by glaciers and rainfall [42,46]. Moreover, the intensity of human influence activities is relatively low.…”

Section: Comparative Analysis Of Dom Concentration In Lake Hulun and mentioning

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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Section: Comparative Analysis Of Dom Concentration In Lake Hulun and mentioning

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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“…2a) (Mao et al, 2018). Wen et al (2019) reported a higher and likely dispersed TN concentration of 3.79±4.46 mg/L during the investigation of DOC in Tibetan lakes (range of 0.18~25.67 mg/L, n=310). The maximum value was from saline lakes.…”

Section: Variations Of Nutrient Concentrations In Qtp Lakesmentioning

confidence: 95%

“…Results for TP concentrations over the same periods did not record a significant trend(p=0.13), the median value recorded a slight increase from 0.024 ± 0.01 mg/L in 1985~1993 (median 0.02 mg/L, range of 0.014~0.041 mg/L, IQR=12.33 μg/L, n = 5) to 0.051±0.098 mg/L in 2010~2015 (median 0.17 mg/L, range of 0.002~0.65 mg/L, IQR=0.027 mg/L, n = 76) (Fig. 2a), while Wen et al (2019) also obtained a concentration of 0.13±0.32 mg/L(n=310), which is two times of our value, suggested that our results may underestimate the nutrient concentration in QTP. According to our study, in 2010~2015, TP concentrations in 14 lakes were higher than the Level II China surface water standard and 7 exceeded the eutrophication threshold set by OECD (>35 μg/L) (OECD, 1982).…”

Section: Variations Of Nutrient Concentrations In Qtp Lakesmentioning

confidence: 97%

“…The orange circles indicate sites sampled during the 2010 and 2016 by Lin et al, (2017); Lu et al, (2017); Yang et al, (2018) and Yan et al, (2018). The green square represents lakes sampled during the 2014 and 2017 by Wen et al, (2019). (b) The samples from Lake Hurleg basin, sample sites during 2016 and 2017 are indicated by red dots, 17 sampling points in Lake Hurleg are now marked in the panel in the lower right corner.…”

Section: Study Areamentioning

confidence: 99%

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Emerging water pollution in the world’s least disturbed lakes on Qinghai-Tibetan Plateau

Wang

et al. 2021

Environmental Pollution

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“…Snow is an important component of the cryosphere (Gao et al, 2021;Shijin et al, 2019;Wang et al, 2019). Its high reflectivity, low thermal conductivity and snowmelt effect have a significant impact on atmospheric circulation, land surface hydrological processes and regional water balance (Liu et al, 2021;Teng et al, 2021;Wen et al, 2019;J. Zhang et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Changes of Snow Cover and Its Relationship With Meteorological Factors on the Qinghai-Tibet Plateau, China

Jin¹,

chen²

2021

Preprint

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The Qinghai-Tibet Plateau (TP) is one of the most sensitive areas to climate change, and its ecological environment changes directly or indirectly reflect the global climate change trend. The snow cover ratio (SCR) is an important indicator reflecting the climate and environmental changes of the TP. The daily remote sensing data of snow cover on the TP from 2003 to 2014 were used to study the spatio-temporal distribution of snow cover on the TP. The results have shown that the average snowmelt day on the TP starts on the 103rd day and ends on the 223rd day of a year, and the snowmelt duration has a downward trend. Snow is mainly distributed in the Nyainqentanglha Mountains, Karakoram Mountains and Himalayas. The SCR in summer has a downward trend, while in autumn has a rising trend. This shows that the difference in SCR during the year has enlarged, increasing the risk of snowmelt floods. The SCR is highly correlated with temperature, but weakly correlated with precipitation. Using the long-term remote sensing data of snow cover, the distribution of glacier coverage on the TP can be extracted, in which glaciers on the TP account for about 1%. This research provides an important reference for in-depth understanding of the snow cover changes on the TP and their impact on the environment.

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Impact factors of dissolved organic carbon and the transport in a river-lake continuum in the Tibet Plateau of China

Cited by 34 publications

References 69 publications

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

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

Emerging water pollution in the world’s least disturbed lakes on Qinghai-Tibetan Plateau

Spatio-Temporal Changes of Snow Cover and Its Relationship With Meteorological Factors on the Qinghai-Tibet Plateau, China

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