Sediment internal nutrient loading in the most polluted area of a shallow eutrophic lake (Lake Chaohu, China) and its contribution to lake eutrophication

Yang, Chunhui; Yang, Pan; Geng, Jian Guo; Yin, Hongbin; Chen, Kaining

doi:10.1016/j.envpol.2020.114292

Cited by 154 publications

(38 citation statements)

References 44 publications

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“…All pH values (6, 8 and 10) tested in this study showed a positive P release, but it was lower in pH 6 and higher in pH 10. Previous studies have demonstrated that P release occurs under both acidic and alkaline conditions, but the release is greater in alkaline (Jin et al, 2006;Li et al, 2013;Yang et al, 2020a), which we also found in this study.…”

Section: Discussionsupporting

confidence: 87%

“…The values of P release rates found in this study (0.22 -2.1 mg m -2 d -1 ) were lower than the P flux found in recent studies: in Jacarepaguá Lagoon, Brazil (2.5 -9.2 mg m -2 d -1 ) (Marinho et al, 2020); in two semiarid reservoirs, Brazil (4 and 10 mg m -2 d -1 ) (Moura et al, 2020); and lake Diefenbaker, Canada (15 -20 mg m -2 d -1 ) (Doig et al, 2017). However, the rates of this study were similar to the values found in hypereutrophic lakes in China, as Yangcheng (1.1 to 1.5 mg m -2 d -1 ) (Yang et al, 2020b) and Lake Chaohu (0.03 to 3.34 mg m -2 d -1 ) (Yang et al, 2020a); and higher than other environments also in China: wetlands sediments (0.002 to 0.014 mg m -2 d -1 ) (He et al, 2017) and Yangtze river (0.105 to 0.143 mg m -2 d -1 ) (Zhu et al, 2012). This variation in values of sediment release rates demonstrates how complex the internal loading process is, which can be the result of many variables: pollution level of environment (external loading), soil composition, water physicochemical parameters, sedimentation rates and other factors.…”

Section: Discussionsupporting

confidence: 79%

“…This is most likely because the amount of P released in 21 days was much less than the amount in the sediment. However, the release of P from sediment can sustain the concentrations of nutrients in overlying water thereby inducing the blooming of algae (Yang et al, 2020a). In this study, the results showed that for the water, there was already been a significant increase in the P during the experiment days.…”

Section: Discussionmentioning

confidence: 52%

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Internal phoshorus loading potential of a semiarid reservoir: an experimental study

et al. 2021

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Aim To determine the internal P loading potential of semiarid tropical reservoir sediment while verifying the driving factors that affect P release rates. Methods An experiment was performed with water and sediment from the reservoir Boqueirão de Parelhas in Brazil. The effects of three variables on P release were studied: air temperature (region average of 28 °C and 32 °C, simulating an increase of 4 °C), pH (region average of pH 8, more acidic pH 6 and more alkaline pH 10) and oxygen (presence and absence). In addition, P fractionation analysis was performed on the P forms in the sediment. Results It was found that the minimum P release was in an oxic treatment at pH 6 and temperature 28 °C (0.22 mg m-2 d-1 ± 0.13) and the maximum P release in an anoxic treatment at pH 10 and temperature 32 °C (2.1 mg m-2 d-1 ± 0.15). The total P in the sediment was 597 mg kg-1, and the major P form in the sediment was NaOH-rP, the P bound to aluminum, corresponding to 42% of the total P. Conclusion These results allow us to confirm that the sediment of the Boqueirão reservoir is susceptible to the release of P bound to aluminum due to the prevalence of this form in its sediments concomitant with the high temperatures and alkaline pH of the water. This scenario can be aggravated by climate change.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionsupporting

confidence: 79%

Section: Discussionmentioning

confidence: 52%

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Internal phoshorus loading potential of a semiarid reservoir: an experimental study

et al. 2021

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“…This leads to a rich flow of organic matter drizzling down to the sediment, where it becomes partly decomposed and mineralized through heterotrophic respiration. This consumes dissolved oxygen and causes hypoxia below the PAR zone [31,37]. In addition, higher temperatures during the summer increase the activity of microorganisms in the sediment and lower the overall capacity of the water to hold oxygen, causing a more rapid loss of oxygen in the water.…”

Section: Sediment Core Characteristics and Variablitymentioning

confidence: 99%

Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input

Zhou

Fu²,

et al. 2021

Water

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Following successful abatement of external nutrient sources, one must shift the focus to the role of phosphorus (P) release from sediment. This enables us to better assess the causes for sustained eutrophication in freshwater ecosystem and how to deal with this challenge. In this study, five sediment cores from the shallow YuQiao Reservoir in northern China were investigated. The reservoir serves as the main raw water source for tap water services of Tianjin megacity, with a population of 15.6 million. Sediment characteristics and P fractions were determined in order to assess the role of the sediments as the P source to the water body. The total P content (TP) in sediments was similar to what was found in catchment soils, although the P sorption capacity of sediments was 7–10 times greater than for the catchment soils. Isotherm adsorption experiments documented that when P concentration in overlying water drops below 0.032–0.070 mg L−1, depending on the site, the sediment contributes with a positive flux of P to the overlying water. Adsorbed P at different depths in the sediments is found to be released with a similarly rapid release rate during the first 20 h, though chronic release was observed mainly from the top 30 cm of the sediment core. Dredging the top 30 cm layer of the sediments will decrease the level of soluble reactive phosphate in the water being sustained by the sediment flux of P.

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“…An increase in sediment temperature, thereby increasing microbial decomposition of organic matter, can accelerate the release of ammonia (NH 4 þ ) and phosphate (PO 4 3À ) from the sediment (Rydin et al 2017). Such internal nutrient loading of NH 4 þ and PO 4 3À promotes phytoplankton blooms in the lake (Yang et al 2020). Release rates of phosphorus (P) from lake sediments are usually highest in summer (Wang et al 2019), but increases in lake water temperatures have been also observed seasonality (Winslow et al 2017).…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Warming of water temperature in spring and nutrient release from sediment in a shallow eutrophic lake

Shinohara

Tsuchiya

Kohzu

2021

Journal of Water and Climate Change

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We investigated whether recent springtime water temperature increases in a shallow eutrophic lake affected bottom sediment temperature and fluxes of ammonia (NH4+) and phosphate (PO43−) from the sediment. We conducted a lake-wide survey of Lake Kasumigaura, Japan, and analyzed the relationship between water temperature increases in spring and NH4+ and PO43− release fluxes. We also developed a numerical model to analyze how water temperature increase affects sediment temperature. Water temperature in May increased during 2010–2019 at a rate of 1.8–3.2 °C decade−1. The numerical simulation results showed that the water temperature increase was accompanied by a sediment temperature increase from a minimum of 18.3 °C in 2011 to a maximum of 21.6 °C in 2015. Despite the substantial difference in the observed sediment temperature (2.9 °C), no significant differences in NH4+ and PO43− fluxes in May between 2013/2014 and 2015 were found. These results suggest that both water and sediment temperatures are increasing in Lake Kasumigaura in spring, but it is unclear whether this warming has affected NH4+ and PO43− releases from the sediment. However, because a nonlinear response to sediment temperature was observed, future springtime warming may accelerate NH4+ and PO43− releases.

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Sediment internal nutrient loading in the most polluted area of a shallow eutrophic lake (Lake Chaohu, China) and its contribution to lake eutrophication

Cited by 154 publications

References 44 publications

Internal phoshorus loading potential of a semiarid reservoir: an experimental study

Internal phoshorus loading potential of a semiarid reservoir: an experimental study

Phosphorus Release from Sediments in a Raw Water Reservoir with Reduced Allochthonous Input

Warming of water temperature in spring and nutrient release from sediment in a shallow eutrophic lake

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