The evolution of water quality and nutrient condition in Lake Dongting in recent 30 years

Xiong, Jian; Fangqin, YU; Tian, Qing; Daizhong, Huang; Li, Liqiang

doi:10.18307/2016.0607

Cited by 12 publications

(7 citation statements)

References 5 publications

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“…The lake as a whole is mildly polluted, and the main pollutant is TP (Xiong et al, 2016;Wang et al, 2020). In addition, the level of TN in the lake is also high, although TN is not considered in the water quality assessment.…”

Section: Nimentioning

confidence: 99%

Can Relative Abundance of Diatoms (RAD) Serve as an Indicator for the Water Quality Assessment in River-Connected Lakes? A Case Study at Dongting Lake

Yan,

Yin,

Wang

et al. 2024

Preprint

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Abstrat: In this study, 15 sampling sites were set up in Dongting Lake, a typical river-connected lake in China, to investigate water quality and phytoplankton in March, June, September and December from year 2017 to 2022. Seven diatom indices, including relative abundance of diatoms (RAD), percentage motile diatoms (PMD), generic diatom index (GDI), diatom quotient (DU), pollution tolerance index for diatoms (PTI), trophic diatom index (TDI), and Pampean diatom index (IDP), were selected to screen the adaptability of water quality assessment comparing with the Nemero index (NI). The monitoring results from 2017 to 2019 showed that the diatom density in Dongting Lake ranged from 0.7×104 to 85.5×104 ind./L, with a certain decreasing trend. The spatial and temporal changes of major water quality factors were obvious, and the ∑TLI ranged from 45.99 to 50.72, with an average value of 47.85, indicating that the overall condition of Dongting Lake was medium nutrition. Correlation analysis showed that PTI, Rad and PMD could represent the information of DU, GDI, TDI and IDP, and were significantly positively correlated with DO (p<0.01), while significantly negatively correlated with Cond, CODMn, BOD5, CODCr and ∑TLI (p<0.001). The index verification results from year 2020 to 2022 showed that PTI, RAD and PMD were all significantly positively correlated with P (p<0.001). Taking into account the data integrity of the index calculation (PMD would appear the phenomenon of zero value) and the difficulty degree (PTI index needs to calculate the tolerance value of diatoms to external stress), RAD was finally selected as the biological indicator for evaluating the water quality of Dongting Lake. The results of this study provide a new path or alternative method for water quality assessment of the river-connected lakes.

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Section: Nimentioning

confidence: 99%

Can Relative Abundance of Diatoms (RAD) Serve as an Indicator for the Water Quality Assessment in River-Connected Lakes? A Case Study at Dongting Lake

Yan,

Yin,

Wang

et al. 2024

Preprint

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“…Dongting Lake is the fourth largest lake in China and the only lake connected to Yangtze River in the MYR, covering an area of about 2580 km 2 , with high suspended sediment content and high turbidity [48]. Over the past few decades, the average TP concentration in Dongting Lake has increased from about 0.05 mg/L in 1986 to about 0.1 mg/L in 2015, showing a significant increasing trend, and TP has gradually become the main influencing factor on the water quality change in Dongting Lake [49]. As the TP concentration in Dongting Lake increases, more and more phosphorus will enter the Yangtze River, bringing challenges to the improvement of the Yangtze River's water quality.…”

Section: The Influence Of Dongting Lake On the Water Quality In The Myrmentioning

confidence: 99%

“…On the one hand, the hydrological situation of the Yangtze River constantly changes the pattern of Dongting Lake [50,51]. On the other hand, the increase of industrial and agricultural pollution, the release of endogenous pollution and the reduction of water environment capacity in the Dongting Lake basin, and the significant increase of nutrients such as TP and TN in the lake will also challenge the water quality of the Yangtze River [49]. Further study is needed to determine the specific impact of Dongting Lake on the water quality of the Yangtze River.…”

Section: The Influence Of Dongting Lake On the Water Quality In The Myrmentioning

confidence: 99%

Monitoring Total Phosphorus Concentration in the Middle Reaches of the Yangtze River Using Sentinel-2 Satellites

Yang,

Feng,

Zhou

et al. 2024

Remote Sensing

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Total phosphorus (TP, a non-optical sensitivity parameter) has become the primary pollutant in the Yangtze River, the third largest river in the world. It is strongly correlated with turbidity (an optical sensitivity parameter) in rivers. In this study, we constructed a turbidity-mediated TP retrieval model using Sentinel-2 observations and field-measured daily-scale water quality. The model was successfully applied to estimate the temporal and spatial variations of TP concentration in the middle reaches of the Yangtze River (MYR) from 2020 to 2023. Our results show: (1) the model accuracy of TP concentration retrieval with turbidity is significantly higher (R2 = 0.71, MAPE = 15.78%) than that for the model without turbidity (R2 = 0.62, MAPE = 16.38%); (2) the turbidity and TP concentration in the MYR is higher in summer and autumn than in winter and spring; and (3) the turbidity and total phosphorus (TP) concentration of the Yangtze River showed a significant increase after passing through Dongting Lake (p < 0.05).

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“…In the past 30 years, the water quality of Dongting Lake has been on the decline, and total nitrogen (TN) and total phosphorus (TP) are the main factors affecting the water quality [13]. With the increase in TN and TP pollutant input, the water quality of Dongting Lake decreased, and the water trophic status was gradually close to the light eutrophication from the mesotrophic level [14]. Many scholars pay more attention to TP than to TN when studying the water environment and nutrient status of Dongting Lake.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Water and Total Nitrogen Contributions from the Inflow Rivers to Lake: A Study of West Dongting Lake in China

Wang

Tian

et al. 2022

Water

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The input of pollutants into the lake has ainfluence on the water quality of the lake. Detailing the contribution of water and nutrients from the inflow rivers are essential for lake water management. Major ions Na+ and Cl− were applied to trace contributions of water and total nitrogen (TN) from the inflow rivers to West Dongting Lake. By using the two-source mixing model and the two-component TN mixing model, the results showed that water and TN in West Dongting Lake were mainly contributed by local rivers rather than the three outfalls, in which the contribution of Yuan River was larger than that of Li River. However, the contribution rates of water and TN of the three outfalls to West Dongting Lake during the wet season reached above 20% and 30%, respectively, indicating that the contribution of the three outfalls to West Dongting Lake could not be ignored. Among them, the contributions of Songzi outfall were higher than those from Taiping and Ouchi outfalls. Therefore, we suggest that the relevant departments should identify key river management targets during different water periods, implement refined management over water pollution in West Dongting Lake, and prioritize the pollutant input of Yuran River and Songzi outfall (especially during the wet season). This study demonstrates that major ion tracing is suitable for estimating the contribution rates of different nutrient sources in the river-lake system, which will provide valuable information for protecting the water quality of West Dongting Lake in the future.

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The evolution of water quality and nutrient condition in Lake Dongting in recent 30 years

Cited by 12 publications

References 5 publications

Can Relative Abundance of Diatoms (RAD) Serve as an Indicator for the Water Quality Assessment in River-Connected Lakes? A Case Study at Dongting Lake

Can Relative Abundance of Diatoms (RAD) Serve as an Indicator for the Water Quality Assessment in River-Connected Lakes? A Case Study at Dongting Lake

Monitoring Total Phosphorus Concentration in the Middle Reaches of the Yangtze River Using Sentinel-2 Satellites

Characterization of Water and Total Nitrogen Contributions from the Inflow Rivers to Lake: A Study of West Dongting Lake in China

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