Dynamics of Chlorophyll a Content in the Ob River and its Relationship with Abiotic Factors

Kotovshchikov, A. V.; Долматова, Л. А.

doi:10.1134/s1995082918010078

Cited by 2 publications

(4 citation statements)

References 9 publications

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“…Additionally, the oxidizing environment contributes to nitrification [78]. The decrease in November probably was due to low temperature and less aquatic plants [49,79]. Saturation index (SI) of reclaimed water and river water samples is given in Table 3.…”

Section: Redox Condition and Nitrogen Formsmentioning

confidence: 99%

“…Additionally, the oxidizing environment contributes to nitrification [78]. The decrease in November probably was due to low temperature and less aquatic plants [49,79]. pH also played an important role in nitrogen transformation, and the double influences of pH and the redox environment could be evaluated by the pH-pE plot [78].…”

Section: Redox Condition and Nitrogen Formsmentioning

confidence: 99%

“…Nitrogen and phosphorus are the nutrient elements for phytoplankton growth. Consequently, N and P contents would be affected by the biomass of phytoplankton [49]. Therefore, the relationship of nutrients with Chl.a were complicated.…”

Section: Assessment Of Water Qualitymentioning

confidence: 99%

“…Therefore, P was the restricted nutrient. Besides, hydrodynamic conditions such as temperature, light, water volume, and flow rate were also important influencing factors [49,81].…”

Section: Assessment Of Water Qualitymentioning

confidence: 99%

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Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Song

Zhang

et al. 2020

Water

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Dry rivers could be effectively recovered by reclaimed water in North China, while river water quality would be an important issue. Therefore, it is important to understand the spatiotemporal variation and controlling factors of river water. Water samples were collected during March, May, July, September, and November in the year 2010, then 20 parameters were analyzed. The water environment was oxidizing and alkaline, which was beneficial for nitrification. Nitrate was the main nitrogen form. Depleted and enriched isotopes were found in reclaimed water and river water, respectively. Total nitrogen (TN) and total phosphorus (TP) of reclaimed water exceed the threshold of reclaimed water reuse standard and Class V in the surface water quality criteria. Most river water was at the severe eutrophication level. The sodium adsorption ratio indicated a medium harmful level for irrigation purpose. Significant spatial and temporal variation was explored by cluster analysis. Five months and nine stations were both classified into two distinct clusters. It was found that 6 parameters (chloride: Cl−, sulphate: SO42−, potassium: K+, sodium: Na+, magnesium: Mg2+, and total dissolved solids: TDS) had significant upward temporal variation, and 12 parameters (dissolved oxygen: DO, electric conductivity: EC, bicarbonate: HCO3−, K+, Na+, Ca2+, TDS, nitrite-nitrogen: NO2-N, nitrate nitrogen: NO3-N, TN, TP, and chlorophyll a: Chl.a) and 4 parameters (Mg2+, ammonia nitrogen: NH3-N, and the oxygen-18 and hydron-2 stable isotope: δ18O and δ2H) had a significant downward and upward spatial trend, respectively. The Gibbs plot showed that river water chemistry was mainly controlled by a water–rock interaction. The ionic relationship and principal component analysis showed that river water had undergone the dissolution of carbonate, calcite, and silicate minerals, cation exchange, a process of nitrification, photosynthesis of phytoplankton, and stable isotope enrichment. In addition, gypsum and salt rock have a potential dissolution process.

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Section: Redox Condition and Nitrogen Formsmentioning

confidence: 99%

Section: Redox Condition and Nitrogen Formsmentioning

confidence: 99%

Section: Assessment Of Water Qualitymentioning

confidence: 99%

“…Therefore, P was the restricted nutrient. Besides, hydrodynamic conditions such as temperature, light, water volume, and flow rate were also important influencing factors [49,81].…”

Section: Assessment Of Water Qualitymentioning

confidence: 99%

See 2 more Smart Citations

Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Song

Zhang

et al. 2020

Water

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Zooplankton as an indicator of hydrological connectivity of the main channel and the floodplain in a large river system

Yanygina,

Burmistrova,

Kotovshchikov

et al. 2023

Hydrobiologia

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The connectivity of the river–floodplain system during floods plays a decisive role in organisms/matter contribution to the ecosystems of large lowland rivers. We hypothesized that the direction of water-level trends during flood was crucial for zooplankton release from the floodplain into the river channel. The seven-year study of zooplankton in the large plain Ob river suggest that at the inundated floodplain even a slight water level fall brings to plankton release from the floodplain into the river thus causing its abundance boom in the main channel. At water-level stabilization or rise, zooplankton communities of floodplain become isolated from the channel that ceases the recruits’ inflow from the floodplain and brings to a sharp drop in number of river zooplankton. Therefore, it is necessary to take into account dynamics trends (i.e., fall or rise) in river water level when assessing zooplankton density in large lowland rivers. The analysis of such trends should become the basis for predicting of river zooplankton abundance and assessing changes in feeding conditions of fish during the growing season.

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Dynamics of Chlorophyll a Content in the Ob River and its Relationship with Abiotic Factors

Cited by 2 publications

References 9 publications

Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Zooplankton as an indicator of hydrological connectivity of the main channel and the floodplain in a large river system

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