Influences of the alternation of wet-dry periods on the variability of chromophoric dissolved organic matter in the water level fluctuation zone of the Three Gorges Reservoir area, China

Jiang, Tao; Wang, Dingyong; Wei, Shiqiang; Yan, Jinlong; Liang, Jiaping; Chen, Xueshuang; Liu, Jiang; Wang, Qilei; Lu, Song; Gao, Jie; Li, Lulu; Guo, Nian; Zhao, Zheng

doi:10.1016/j.scitotenv.2018.04.262

Cited by 74 publications

(23 citation statements)

References 86 publications

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“…The Three Gorges Reservoir has strongly affected the Yangtze River Basin, both because the Yangtze River Basin is the largest river basin in the world and because the Three Gorges Dam is the largest hydropower project in the world (Jiang et al, 2018). The dam's construction occurred from 1993 to 2009, with a total reservoir capacity of 39.3 × 10 9 m 3 .…”

Section: Study Area and Methodsmentioning

confidence: 99%

Effects of Ecological Restoration Measures on Soil Erosion Risk in the Three Gorges Reservoir Area Since the 1980s

Xiao

Xiong

et al. 2020

GeoHealth

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Ecosystem degradation accompanied by soil erosion risk is caused by the interaction of many factors, including climate change and human activities. Therefore, before attempting the optimal form of ecological restoration, we must know the key factors responsible for soil erosion risk and determine their impacts on the ecosystem health. To test this approach, we conducted a case study in the Three Gorges Reservoir Area from 1980 to 2015, where extensive restoration (primarily afforestation) has been conducted. The results showed Climate was most important during Period I (1980 to 1984), and explained 84% of the variation in erosion. However, vegetation became equally important during Period II (1985 to 2006), when it accounted for 51% of the variation. Climate became as important as vegetation during Period III (2007 to 2015), when it accounted for 51% of the variation. The temporal variation in the dominant factors that controlled soil erosion risk suggests that the ecological effect of vegetation improvement resulting from ecological restoration in Three Gorges Reservoir Area has been gradually enhanced since 1980s.

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Section: Study Area and Methodsmentioning

confidence: 99%

Effects of Ecological Restoration Measures on Soil Erosion Risk in the Three Gorges Reservoir Area Since the 1980s

Xiao

Xiong

et al. 2020

GeoHealth

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“…Although the water dilution effect caused by the impoundment can alleviate pollution (Jiang et al, 2018), the periodic mean NO − 3-N and TN concentrations continuously increased during three impoundments, indicating the greater effect of the ever-increasing external input from a long run. However, the change in the proportion of N forms caused by reservoir storage could not be ignored.…”

Section: N Input In the Tgr Basinmentioning

confidence: 96%

Long-term impacts of reservoir operation on the spatiotemporal variation in nitrogen forms in the post-Three Gorges Dam period (2004–2016)

Nie

Chen

Niu

et al. 2021

Environ Sci Pollut Res

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Nitrogen (N) is an essential nutrient limiting life, and its biochemical cycling and distribution in rivers have been markedly affected by river engineering construction and operation. Here, we comprehensively analyzed the spatiotemporal variations and driving environmental factors of N distributions based on the long-term observations (from 2004 to 2016) of seven stations in the Three Gorges Reservoir (TGR). In the study period, the overall water quality status of the river reach improved, whereas N pollution was severe and tended to be aggravated after the TGR impoundment. The anti-seasonal reservoir operation strongly affected the variations in N forms. The total nitrogen (TN) concentration in the mainstream of the Yangtze River continuously increased, although it was still lower than that in the incoming tributaries (Wu and Jialing rivers). Further analysis showed that this increase occurred probably because of external inputs, including the upstream (76%), non-point (22%), and point source pollution inputs (2%). Besides, different N forms showed signi cant seasonal variations; among them, the TN and nitrate nitrogen concentrations were the lowest in the impoundment season (October-February), and the ammonia nitrogen concentrations were the highest in the sluicing season (March-May). These parameters varied likely because of internal N transformation. Redundancy analysis revealed that the water level regulated by the anti-seasonal operation was the largest contributor. Our ndings could provide a basis for managing and predicting the water quality in the Yangtze River.

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“…Quantified as a(355), CDOM concentrations ranged from 0 to 15.895 m −1 in the examined rivers ( Figure 3a-d). The alpine-gorge rivers had an average a(355) level of 1.26 ± 1.08 m −1 , which was close to aquatic systems dominated by autochthonous sources (usually < 1.0 m −1 ) [51], while the Zoige rivers had an average a(355) level of 8.37 ± 4.71 m −1 , belonging to the terrigenous-dominated type (usually > 5.0 m −1 ) [35]. The Bai River stands out as having the highest average a(355)/DOC, SUVA 254 , and lowest average S R value of all examined rivers.…”

Section: Cdom and Cdom/docmentioning

confidence: 99%

“…where A(λ) is the measured absorbance at wavelength λ and l is the cuvette path length 1 cm [12]. The absorption coefficient at 355 nm was selected to represent the relative concentration of CDOM [33][34][35]. SUVA 254 (L•mg C −1 •m −1 ) was defined as dividing the UV absorbance at λ = 254 nm by the DOC concentration (mg•L −1 ), and higher values indicate greater aromaticity [14].…”

Section: Doc and Cdom Absorption Determinationmentioning

confidence: 99%

“…Thus, the dilution effect of the increased runoff in the alpine-gorge rivers, which contributes to lower DOC concentrations in June, cannot be neglected anymore. In the meantime, the presence of lower DOC concentrations in June than November in the alpine-gorge rivers may also result from the greater influences of photochemical and microbial degradation, considering that the increased light level and longer water residence time in June could both facilitate the degradation of DOM [35].…”

Section: Seasonal Variationmentioning

confidence: 99%

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Spatiotemporal Dynamics of Dissolved Organic Carbon and Freshwater Browning in the Zoige Alpine Wetland, Northeastern Qinghai-Tibetan Plateau

Zhang

Qin

Sun

et al. 2020

Water

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The concentrations of dissolved organic carbon (DOC) and its light-absorbing fraction (chromophoric dissolved organic matter; CDOM) in surface waters, particularly those draining organic-rich peatlands, have dramatically increased over the past decade due to climate change and human disturbance. To explore the spatiotemporal dynamics of DOC and CDOM in surface waters of the northeastern Qinghai-Tibetan Plateau, we collected water samples from two rivers in the Zoige alpine wetland and from two rivers in its adjacent alpine-gorge region, during wet and dry seasons. DOC concentration ranged from 4.82 mg·L−1 to 47.83 mg·L−1, with a mean value of 15.04 mg·L−1, 2.84 times higher than the global average. The Zoige rivers had higher DOC concentration and highly terrigenous CDOM. Significantly higher DOC concentration was observed for the Zoige rivers in the wet season compared to the dry season. In contrast, the alpine-gorge rivers had higher DOC levels in the dry season. No significant correlations were observed between DOC and CDOM at all rivers due to the influence of autochthonous sources on the alpine-gorge rivers and intensive photochemical degradation of terrigenous DOM in the Zoige rivers. Significant relationships between CDOM and specific ultraviolet absorbance at 254 nm (SUVA254) and between CDOM/DOC and SUVA254 were observed, indicating that the aromaticity of DOM in the rivers was mainly determined by CDOM. Moreover, the DOC/CDOM properties of the Hei River indicate critical human-induced water quality degradation. High DOC level and high browning degree were found in rivers in the Zoige alpine wetland, indicating that large amounts of terrigenous DOC were released to the aquatic systems of the region.

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Influences of the alternation of wet-dry periods on the variability of chromophoric dissolved organic matter in the water level fluctuation zone of the Three Gorges Reservoir area, China

Cited by 74 publications

References 86 publications

Effects of Ecological Restoration Measures on Soil Erosion Risk in the Three Gorges Reservoir Area Since the 1980s

Effects of Ecological Restoration Measures on Soil Erosion Risk in the Three Gorges Reservoir Area Since the 1980s

Long-term impacts of reservoir operation on the spatiotemporal variation in nitrogen forms in the post-Three Gorges Dam period (2004–2016)

Spatiotemporal Dynamics of Dissolved Organic Carbon and Freshwater Browning in the Zoige Alpine Wetland, Northeastern Qinghai-Tibetan Plateau

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