Effect of dissolved oxygen on nitrogen and phosphorus fluxes from lake sediments and their thresholds based on incubation using a simple and stable dissolved oxygen control method

Osaka, Ken’ichi; Yokoyama, Rei; Ishibashi, Takehiko; Goto, Nobuo

doi:10.1002/lom3.10466

Cited by 6 publications

(6 citation statements)

References 34 publications

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“…The effect of dissolved oxygen deficiency on the supply of nitrogen and phosphorus inorganic forms from bottom sediments has been reported in numerous publications (Denisova et al, 1987;Osaka et al, 2022;Penn et al 2000). The influence of the oxygen regime on the nitrogen and phosphorus inorganic forms content was shown for Opechen' system's lakes (Fig.…”

Section: Nitrogen and Phosphorusmentioning

confidence: 65%

Metals and biogenic substances’ migration ability in the «bottom sediments – water» system under natural and experimental conditions

Linnik,

Zhezherya,

Zhezherya

2024

Journ. Geol., Geogr., and Geoec..

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The paper considers the results of long-term studies on some chemical elements’ migration (Al, Fe, Ti, Mn, Cu, Zn, Pb, N, P, Si) in the «bottom sediments – water» system of surface water bodies under the effect of different aquatic environment factors. The greatest effect is made by water bodies’ oxygen regime, pH, and presence of dissolved organic substances, in particular humic substances. The migration of manganese, iron, inorganic nitrogen and phosphorus from bottom sediments is controlled mostly by oxygen regime. Migration of these chemical elements significantly increases, when there is oxygen deficiency and anaerobic conditions are formed in the bottom water layer. It has been observed in both natural and experimental conditions. Man- ganese concentration increases in bottom water in 25–50 times, iron – in 1.3–13, inorganic nitrogen – in 5.3–19.3, and inorganic phosphorus – in 2.8–23 times. The dissolved oxygen concentration hardly has any effect on the migration of aluminium, titanium, copper, zinc, lead, and silicon from bottom sediments into the water. The chemical elements’ migration is significantly affected by a decrease in pH of water contacting with bottom sediments and the presence of humic substances in it. High humic substances concentrations promote a reduction in water pH and oxygen content, which is consumed for their oxidation. A case study of several water bodies illustrates the cumulative effect of water pH lowering, anaerobic conditions at the solid and liquid phases’ interface, as well as complexation with humic substances on chemical elements’ migration from bottom sediments. Experimental modeling has shown that the metal migration from bottom sediments occurs both due to their labile fractions and complex compounds with dissolved organic matter, especially with humic substances of low molecular weight (≤2.0 kDa). The share of the metal labile fraction gets higher, when water pH decreases. Under recent climate change, the probability of water’s secondary pollution with different chemicals increases significantly in summer. This is mainly caused by oxygen deficiency, water pH lowering, and reducing conditions at the «bottom sediments – water» interface with hydrogen sulphide being formed. This is especially true for highly eutrophic water bodies subject to human impact. The aquatic environment toxicity can get considerably higher due to the migration of chemicals with strong toxic properties from bottom sediments, as well as labile metal fractions, marked by higher bioavailability for hydrobionts.

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Section: Nitrogen and Phosphorusmentioning

confidence: 65%

Metals and biogenic substances’ migration ability in the «bottom sediments – water» system under natural and experimental conditions

Linnik,

Zhezherya,

Zhezherya

2024

Journ. Geol., Geogr., and Geoec..

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“…In monsoon Asia, the frequency and intensity of precipitation increases during the summer rainy season when lakes experience thermal stratification. The stratification makes the lake bottom reductive, which in turn enhances the regeneration of bioavailable phosphorous from the sedimentary PP (Osaka et al, 2022). Therefore, the riverine PP can be biologically recycled more than would be expected in the lake ecosystem.…”

Section: Discussionmentioning

confidence: 99%

Hydrological control of the chemical characteristics of suspended particulate phosphorus in the Yasu River watershed, Japan: Implications for its source and bioavailability

Osaka

Chishiro

Matsumoto

et al. 2022

Hydrological Processes

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Several studies have demonstrated the importance of the bioavailability of particulate phosphorus (PP) exported from various watersheds, especially agricultural land. However, few studies have documented the influence of hydrological conditions on the sources and bioavailability of PP exported from watersheds with multiple land uses.In this study, to assess the sources and bioavailability of PP under different hydrological conditions, we conducted synoptic monitoring of compositional changes in the chemical fractions of PP exported from the Yasu River Watershed, which is covered with a mixture of forest (57.7%) and rice paddy (20.5%) areas. In this river, total phosphorus was composed mainly of PP at all monitoring sites and time points. The sequential extraction of PP revealed that a fraction bound to redox-sensitive iron and manganese, regarded as bioavailable, was specific to the drainage waters of rice paddies, while a fraction bound to organic matter, regarded as less bioavailable, was specific to a forested stream. In the downstream of the Yasu River covering the whole watershed, PP exported under the base flow and small rainfall conditions was composed mainly of the rice paddy-derived fraction, while most of the PP exported under heavy rainfall conditions was the forest-derived fraction. These results suggest that the sources and bioavailability of PP can vary dynamically, depending on the hydrological regimes and land use pattern in the watershed. Even taking into account the fact that the large amount of PP exported during heavy rainfall is considered to be forest-derived PP with low bioavailability, the monitoring results suggested that the annual amount of bioavailable PP exported is larger than that of dissolved phosphorus, and can have a large impact on phosphorus recycling in the downstream lake ecosystem through sedimentation and regeneration.

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“…The percent of the total number of DO readings that was hypoxic or anoxic was also calculated for each site across the full study period (1968–2019). A threshold of 2 mg/L was chosen as an intermediate estimate of hypoxic conditions and corresponds with recent work that found SRP fluxes from lake sediments rapidly increased when DO concentrations were <1.5 mg/L (Osaka et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

Turning up the heat: Long‐term water quality responses to wildfires and climate change in a hypereutrophic lake

2022

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Clear Lake (Lake County, CA, USA) is hypereutrophic and used for drinking water, tribal use, and supports a significant fishing economy. The Mendocino Complex (2018), one of the largest wildfires in California's post‐settlement history, burned 40% of the Clear Lake watershed, providing a timely opportunity to study the impacts of historical and current wildfires on this valuable aquatic resource. Using long‐term monthly monitoring data from 1968 to 2019, paired with historical watershed fire data, we found that for the three largest fire years in the watershed's history, 3‐year postfire median July–October epilimnetic total phosphorus (TP) concentrations were below or equal to 3‐year prefire TP concentrations. However, both median TP epilimnetic concentrations and deepwater temperature across the lake have increased since the late 1960s. Long‐term TP increases were more strongly correlated with monthly maximum air temperatures than precipitation, suggesting a potential role of warming‐induced water column stratification, dissolved oxygen (DO) depletion, and high potential for internal phosphorus loading. Hypoxic occurrences were correlated with higher hypolimnetic soluble reactive phosphorus and TP concentrations, but additional high‐frequency monitoring of DO will help determine the duration of anoxia and its contribution to internal phosphorus loading. These long‐term data suggest that for this large, hypereutrophic lake, wildfires did not significantly alter in‐lake TP concentrations based on long‐term, monthly monitoring and that other internal or external sources of TP may mask any wildfire effects. Nonetheless, our study underscores the value of synthesizing decades of water quality, watershed wildfire, and climate data to build a more comprehensive, nuanced picture of multiple long‐term threats to aquatic ecosystems under global change. Moreover, monitoring and studying fire effects across a wide range of lake types beyond this study will help promote more effective lake management during changing climates and increasingly frequent large wildfires.

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Effect of dissolved oxygen on nitrogen and phosphorus fluxes from lake sediments and their thresholds based on incubation using a simple and stable dissolved oxygen control method

Cited by 6 publications

References 34 publications

Metals and biogenic substances’ migration ability in the «bottom sediments – water» system under natural and experimental conditions

Metals and biogenic substances’ migration ability in the «bottom sediments – water» system under natural and experimental conditions

Hydrological control of the chemical characteristics of suspended particulate phosphorus in the Yasu River watershed, Japan: Implications for its source and bioavailability

Turning up the heat: Long‐term water quality responses to wildfires and climate change in a hypereutrophic lake

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