Assessment of the salinization processes in the largest inland freshwater lake of China

Guo, Mengjing; Zhou, Xiaode; Li, Jing; Wu, Wenbin; Chen, Yongmin

doi:10.1007/s00477-014-0995-z

Cited by 24 publications

(11 citation statements)

References 34 publications

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“…Previous studies have shown that salinity decreases with depth and water temperature, that is, the salinity in summer is lower than in other seasons in the northern hemisphere [5,6,51,78]. However, this study showed that the salinity of Chagan Lake increases with temperature from spring to summer (Figure 5).…”

Section: Spatial-temporal Changes Of Lake Water Salinitycontrasting

confidence: 68%

“…According to Hammer [56], saline lakes have a salinity level equal to or in excess of 3.00 psu, freshwater lakes have dissolved salt concentrations of less than 0.5 psu, and sub-saline lakes have a salinity level between 0.5 and 3.0 psu. Based on this classification, Chagan Lake may eventually evolve from a freshwater lake to sub-saline lake, similar to the process of salinization of the Boston Lake [28,51]. However, the depth of Chagan Lake is less than Boston Lake [51,61], hence the ecosystem of Chagan Lake is more vulnerable to water salinization.…”

Section: The Effect Of Salinization On Lake Ecosystem Healthmentioning

confidence: 99%

“…With the unceasing promotion of computer performance, numerical modeling integrated with field and laboratory data has proven to be an effective tool for describing the complex physical [44][45][46], chemical, and biological processes [47,48] and their interactions between state variables [49,50]. Since numerical modeling can replicate variation of salinity at any spatial-temporal scale, extensive studies have been done to explore the effects of agricultural activities on lake salinity [6,20,51,52]. Moreover, more modeling is necessary to understand the vulnerability of salinity in various ecosystems [53], to subsequently aid in the formulation of sustainable water management [54] and development plans in irrigation areas [55].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Irrigation Discharge on Salinity of a Large Freshwater Lake: A Case Study in Chagan Lake, Northeast China

Liu

Zhang

et al. 2020

Water

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The salinization of freshwater lakes by agricultural activities poses a threat to many lake ecosystems around the world. Quantitative, medium- to long-term studies are needed to understand how some common agricultural practices, such as the discharge of crop irrigation in the vicinities of large lakes, may affect lake salinization. In this study, hydrological, hydrodynamics, water quality and meteorological datasets were used to analyze the long-term spatial-temporal variations of water salinities of a major lake, the Chagan Lake, in Northeast China. An integrated hydrodynamics-salinity model was used to simulate lake water salinity changes taking place at different times and locations, including (i) salt accumulations during a non-frozen period, and (ii) the time when water salinity may reach a significant threshold (1 psu) that jeopardizes a major environmental and economic value of this lake (i.e., the cultivation of local fish species). The results confirmed that Chagan Lake was indeed undergoing salinization in the ten year period between 2008 and 2018. The spatial-temporal patterns of the salinization processes were identified. For instance, (i) the mean salinity of the lake water was found to be 0.55 psu in the summer season of the region and 0.53 psu in the winter, and (ii) between May to October the salinity was up to 0.62 psu in the western region of the lake. The rate of salt accumulation was found to be 97 ton per annum during the non-frozen period. The simulation predicted that by 2024 the lake water will become sub-saline (salinity > 1.07 psu) which is toxic to fish species, if the current practice of irrigation discharge into the lake continues. In the scenario that the amount of irrigation discharges into the lake doubles, the western region of the lake will become sub-saline within one year, and then the whole lake within three years. Overall, this study has produced results that are useful to authorities around the world, for balancing the risks and benefits of developing crop irrigation fields in areas surrounding large freshwater lakes.

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Section: Spatial-temporal Changes Of Lake Water Salinitycontrasting

confidence: 68%

Section: The Effect Of Salinization On Lake Ecosystem Healthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Irrigation Discharge on Salinity of a Large Freshwater Lake: A Case Study in Chagan Lake, Northeast China

Liu

Zhang

et al. 2020

Water

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“…Lake salinization and desalination are growing environmental problems caused by both human activities (Dugan et al, 2017) and climate changes (Fedotov et al, 2013). Continuous anthropogenic perturbations and climate changes (e.g., drying, humidification) often lead to lake surface area shrinkage or enlargement, resulting in salinization (i.e., salinity increase) (Micklin, 2007;Guo et al, 2015) or desalination (i.e., salinity decrease) (Schulz, 2000;Fedotov et al, 2013), respectively. Long-term salinization and desalination constantly change the salinity and other physiochemical variables in lakes.…”

Section: Introductionmentioning

confidence: 99%

Microbial Responses to Simulated Salinization and Desalinization in the Sediments of the Qinghai–Tibetan Lakes

et al. 2020

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Uncovering microbial response to salinization or desalinization is of great importance to understanding of the influence of global climate change on lacustrine microbial ecology. In this study, to simulate salinization and desalinization, sediments from Erhai Lake (salinity 0.3-0.8 g/L) and Chaka Lake (salinity 299.3-350.7 g/L) on the Qinghai-Tibetan Plateau were transplanted into different lakes with a range of salinity of 0.3-299.3 g/L, followed by in situ incubation for 50 days and subsequent geochemical and microbial analyses. Desalinization was faster than salinization in the transplanted sediments. The salinity of the transplanted sediment increased and decreased in the salinization and desalinization simulation experiments, respectively. The TOC contents of the transplanted sediments were lower than that of their undisturbed counterparts in the salinization experiments, whereas they had a strong negative linear relationship with salinity in the desalinization experiments. Microbial diversity decreased in response to salinization and desalinization, and microbial community dissimilarity significantly (P < 0.01) increased with salinity differences between the transplanted sediments and their undisturbed counterparts. Microbial groups belonging to Gammaproteobacteria and Actinobacteria became abundant in salinization whereas Bacteroidetes and Chloroflexi became dominant in desalinization. Among the predicted microbial functions, hydrogenotrophic methanogenesis, methanogenesis through CO 2 reduction with H 2 , nitrate/nitrogen respiration, and nitrification increased in salinization; in desalinization, enhancement was observed for respiration of sulfur compounds, sulfate respiration, sulfur respiration, thiosulfate respiration, hydrocarbon degradation, chemoheterotrophy, and fermentation, whereas depressing was found for aerobic ammonia oxidation, nitrate/nitrogen respiration, nitrification, nitrite respiration, manganese oxidation, aerobic chemoheterotrophy, and phototrophy. Such microbial variations could be explained by changes of transplantation, salinity, and covarying variables. In summary, salinization and desalinization had profound influence on the geochemistry, microbial community, and function in lakes.

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“…In addition, the amount of industrial sewage continued to increase. For these reasons, the water quality of Bosten Lake has become salter (Guo et al, 2015). It is widely accepted that in the arid and semi-arid regions with fragile eco-environments, once the water environment is deteriorated, it will be difficult to reverse.…”

Section: Introductionmentioning

confidence: 99%

Impacts of climate change and agricultural activities on water quality in the Lower Kaidu River Basin, China

et al. 2020

J. Geogr. Sci.

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In the context of climate change and over-exploitation of water resources, water shortage and water pollution in arid regions have become major constraints to local sustainable development. In this study, we established a Soil and Water Assessment Tool (SWAT) model for simulating non-point source (NPS) pollution in the irrigation area of the lower reaches of the Kaidu River Basin, based on spatial and attribute data (2010-2014). Four climate change scenarios (2040-2044) and two agricultural management scenarios were input into the SWAT model to quantify the effects of climate change and agricultural management on solvents and solutes of pollutants in the study area. The simulation results show that compared to the reference period (2010-2014), with a decline in streamflow from the Kaidu River, the average annual irrigation water consumption is expected to decrease by 3.84×10 8 m 3 or 8.87% during the period of 2040-2044. Meanwhile, the average annual total nitrogen (TN) and total phosphorus (TP) in agricultural drainage canals will also increase by 10.50% and 30.06%, respectively. Through the implementation of agricultural management measures, the TN and TP in farmland drainage can be reduced by 14.49% and 16.03%, respectively, reaching 661.56 t and 12.99 t, accordingly, and the increasing water efficiency can save irrigation water consumption by 4.41×10 8 m 3 or 4.77%. The results indicate that although the water environment in the irrigation area in the lower reaches of the Kaidu River Basin is deteriorating, the situation can be improved by implementing appropriate agricultural production methods. The quantitative analysis results of NPS pollutants in the irrigation area under different scenarios provide a scientific basis for water environmental management in the Kaidu River Basin.

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Assessment of the salinization processes in the largest inland freshwater lake of China

Cited by 24 publications

References 34 publications

Effects of Irrigation Discharge on Salinity of a Large Freshwater Lake: A Case Study in Chagan Lake, Northeast China

Effects of Irrigation Discharge on Salinity of a Large Freshwater Lake: A Case Study in Chagan Lake, Northeast China

Microbial Responses to Simulated Salinization and Desalinization in the Sediments of the Qinghai–Tibetan Lakes

Impacts of climate change and agricultural activities on water quality in the Lower Kaidu River Basin, China

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