Investigation of phosphorus fractions and isotherm equation on the lake sediments in Ekbatan Dam (Iran)

Shoja, Hojat; Rahimi, Ghasem; Fallah, Mahboobeh; Ebrahimi, Eisa

doi:10.1007/s12665-017-6548-2

Cited by 15 publications

(5 citation statements)

References 60 publications

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“…Cooper & Thomsen (1988) reported that the range of DRP in different land uses varied from 14 to 38% of TP. The values of DRP reported by Shoja et al (2017) for a semi-arid region are less than the values recorded in the temperate region in this study, which attributes to the less rainfall rate and less transfer of P from agricultural lands to the dam reservoir.…”

Section: Discussioncontrasting

confidence: 87%

“…According to many local studies, P concentration showed spatial and temporal variations in some river waters in Guilan province, North of Iran (Asadi et al 2018;Latifi et al 2018). Many studies have also shown that P is transported in stream waters in various forms (Shoja et al 2017;Asadi et al 2018;Zhou et al 2020). It is crucial to get a comprehensive insight into the status of different forms of N and P and their variations in the rivers' bodies to prevent the contamination of water resources.…”

Section: Introductionmentioning

confidence: 99%

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Effect of precipitation and sediment concentration on the loss of nitrogen and phosphorus in the Pasikhan River

Ebrahimi

Asadi

Rahmani

et al. 2022

Journal of Water Supply: Research and Technology-Aqua

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Natural and anthropogenic factors influence the entry of pollutants into surface waters and their accumulation in aquatic ecosystems. This study aimed to investigate precipitation and sediment concentration on the outflow of different forms of phosphorus (P) and nitrogen (N) in three primary land-use types along the Pasikhan River, the biggest river entering the Anzali Wetland in the Southern Caspian sea. Water sampling was performed on a monthly basis during the time bracket of 2017–2018. Different forms of P including total, soluble, particulate, total reactive, and dissolved reactive, and total Kjeldahl N, soluble N, particulate N, and were determined in the water samples. Total phosphorus and total Kjeldahl nitrogen contents lay within the range of 2.2–4.7 and from 0.14 to 0.33 mg l−1, respectively, downstream of the river. The highest monthly outflow of P from the watershed at the Agriculture station was recorded in October. Substantial conformity was found between the monthly trends of and and the trend of precipitation. The results indicated that sediment load intensified after an increase in the rainfall rate, leading to elevated N and P concentrations in the river water, mainly as particulate phosphorus and soluble nitrogen. It can also be inferred from the result that the concentration of N and P is directly related to the sediment concentration increase due to the rainfall. Increasing levels of nutrients such as N and P in the Pasikhan River can cause eutrophication in the Anzali Wetland, which needs conservative measures for reducing these elements' dynamic in the watershed.

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Section: Discussioncontrasting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Effect of precipitation and sediment concentration on the loss of nitrogen and phosphorus in the Pasikhan River

Ebrahimi

Asadi

Rahmani

et al. 2022

Journal of Water Supply: Research and Technology-Aqua

Self Cite

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“…Previous studies have also confirmed this explanation: the presence of dams dramatically altered important habitat properties such as dissolved oxygen, electric conductivity, water content, total nitrogen, and total phosphorus in sediment [ 43 ]. In addition, dam construction changed the nitrogen transport process consequently prompting a dual impact on the regional water environment and hydrodynamic disturbance made the endogenous nitrogen release load in sediments the second largest source of nitrogen in the estuary, which might be an important factor in accelerating estuarine algal blooms and habitat degradation, and the accumulation of P in water through river flows probably leads to eutrophication [ 44 , 45 ].…”

Section: Discussionmentioning

confidence: 99%

pH Drives Differences in Bacterial Community β-Diversity in Hydrologically Connected Lake Sediments

Yuan

Qin

et al. 2023

Microorganisms

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As microorganisms are very sensitive to changes in the lake environment, a comprehensive and systematic understanding of the structure and diversity of lake sediment microbial communities can provide feedback on sediment status and lake ecosystem protection. Xiao Xingkai Lake (XXL) and Xingkai Lake (XL) are two neighboring lakes hydrologically connected by a gate and dam, with extensive agricultural practices and other human activities existing in the surrounding area. In view of this, we selected XXL and XL as the study area and divided the area into three regions (XXLR, XXLD, and XLD) according to different hydrological conditions. We investigated the physicochemical properties of surface sediments in different regions and the structure and diversity of bacterial communities using high-throughput sequencing. The results showed that various nutrients (nitrogen, phosphorus) and carbon (DOC, LOC, TC) were significantly enriched in the XXLD region. Proteobacteria, Firmicutes, and Bacteroidetes were the dominant bacterial phyla in the sediments, accounting for more than 60% of the entire community in all regions. Non-metric multidimensional scaling analysis and analysis of similarities confirmed that β-diversity varied among different regions. In addition, the assembly of bacterial communities was dominated by a heterogeneous selection in different regions, indicating the important influence of sediment environmental factors on the community. Among these sediment properties, the partial least squares path analysis revealed that pH was the best predictor variable driving differences in bacterial communities in different regions, with higher pH reducing beta diversity among communities. Overall, our study focused on the structure and diversity of bacterial communities in lake sediments of the Xingkai Lake basin and revealed that high pH causes the β-diversity of bacterial communities in the sediment to decrease. This provides a reference for further studies on sediment microorganisms in the Xingkai Lake basin in the future.

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“…When comparing the EPC 0 values with the overlying water SRP values, it was emphasized that the higher EPC 0 values facilitated phosphate release from the sediment, and that the sediment played a role as a phosphate source (Wang et al, 2012). Shoja et al (2017), in their study of Ekbatan Reservoir (Iran), found that the EPC 0 value was much higher than the SRP concentration and that, despite the high adsorption capacity of the sediment, phosphate release from the sediment could occur. The fact that the estimated EPC 0 values in Lake Mogan are lower than the SRP concentrations found in the overlying water, unlike the findings of Wang et al (2012) and Shoja et al (2017), points to phosphorus adsorption in the sediment.…”

Section: Discussionmentioning

confidence: 99%

Determination of Sediment Phosphate Sorption Characteristics in Shallow Mogan Lake, Turkey

Topçu¹,

Ulusoy²,

Pulatsü³

2018

Appl. Ecol. Env. Res.

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This study was conducted on sediment and overlying water samples from Mogan Lake, an important recreational area, in April, July and October 2015 and January 2016. The noteworthy data for this study were presented as follows: a) Sediment adsorption/desorption characteristics dependent on phosphate concentration, temperature and time were determined using models, and the relevant parameters were derived. b) Sediment equilibrium phosphate concentrations (EPC 0 ) and the critical dissolved phosphorus in the overlyingwater were estimated. Presentation of the research data is as follows: a) Phosphorous adsorption in the sediment samples was theoretically between 421 mgP kg -1 and 1,001 mgP kg -1 , and phosphorus sorption efficiency was estimated at 0.21-1.92 L mg -1 . Based on the Langmuir Model, the mean maximum adsorption capacity obtained for the July samples was significantly higher than that obtained for October (p < 0.05). Moreover, regarding the very low degree of sediment phosphorus desorption (<1%), it can be concluded that sediment does not behave as a desorbant material for phosphorus. b) Considering the EPC 0 values (5.5 × 10 -3 and 46.6 × 10 -3 mg L -1 ), when the overlying water SRP concentrations fall below 0.008 mg L -1 in October and 0.046 mg L -1 in July, there will be a risk of phosphorus flux from the sediment to the lake water. Considering the overlying water SRP values reported for Lake Mogan, monitoring them in the months of October and July will prove to be decisive in predicting the internal phosphorus load of the lake.

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Investigation of phosphorus fractions and isotherm equation on the lake sediments in Ekbatan Dam (Iran)

Cited by 15 publications

References 60 publications

Effect of precipitation and sediment concentration on the loss of nitrogen and phosphorus in the Pasikhan River

Effect of precipitation and sediment concentration on the loss of nitrogen and phosphorus in the Pasikhan River

pH Drives Differences in Bacterial Community β-Diversity in Hydrologically Connected Lake Sediments

Determination of Sediment Phosphate Sorption Characteristics in Shallow Mogan Lake, Turkey

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