The actual role of oxygen deficit in the linkage of the water quality and benthic phosphorus release: Potential implications for lake restoration

Tammeorg, Olga; Möls, Tõnu; Niemistö, Juha; Holmroos, Heidi; Horppila, Jukka

doi:10.1016/j.scitotenv.2017.04.244

Cited by 47 publications

(41 citation statements)

References 33 publications

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“…The results of multiannual studies on the efficiency of lake aeration seem to call into question the paradigm that oxygen controls the release of phosphorus from sediments [47,48]. Anaerobic sediments generally do not affect the productivity of lakes, and phosphorus is permanently deposited only in the deeper layers of the sediment [49]. Many notable authors have claimed that both the release of phosphorus and oxygen depletion result from the increased trophic state of a reservoir.…”

Section: Discussionmentioning

confidence: 99%

Trophic State and Oxygen Conditions of Waters Aerated with Pulverising Aerator: The Results from Seven Lakes in Poland

Siwek

Włodarczyk

Czerniawski

2018

Water

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Eutrophic lakes of all types are marked by oxygen shortage in the bottom waters during the summer season, which results in excessive release of phosphorus load. Therefore, numerous restoration activities (chemical precipitation, aeration) are being taken based on bottom-up control, which consists of limiting the nutrient pool available to lower trophic levels. The present study provides an efficiency analysis of pulverising aeration of waters in two stratified and five unstratified lakes located in Poland. The assessment was based on monitoring data (dissolved oxygen concentration (DO), % oxygen saturation (DO%), visibility of the Secchi disc (ZSD), the concentrations of: chlorophyll a (CHL), total phosphorus (TP) and total nitrogen (TN)) obtained before and after installation of the aerator on the lakes. The study was conducted during the spring and the summer seasons. Throughout the study period, the stratified lakes exhibited oxygen saturation <0.1%. Having completed the restoration activities, TN:TP ratio was found to gradually increase in all analysed lakes, which indicates that aeration may decrease phosphate content in the water column. In three lakes, the ratio was >17, so phosphorus became the most growth-limiting nutrient. The restoration activities on four unstratified lakes had no significant effect on the changes of the Carlson trophic state indices (TSI). Either individual values of the TSI(TP), TSI(CHL) and TSI(ZSD) were comparable, or the value of TSI(TP) was higher than one or both of the remaining indices for all of the lakes.

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Section: Discussionmentioning

confidence: 99%

Trophic State and Oxygen Conditions of Waters Aerated with Pulverising Aerator: The Results from Seven Lakes in Poland

Siwek

Włodarczyk

Czerniawski

2018

Water

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“…The significance was adjusted with the Bonferroni's correction. The approach of using PCs as independent variables has proven to be an effective tool in predicting internal P loading and water quality variables (Tammeorg et al 2017). Noteworthy, the effect (significant or not) of a PC on TP accumulation does not depend on the proportion of the lake variance that the specific PC describes.…”

Section: Methodsmentioning

confidence: 99%

“…The mean depth of the lakes varied from 1.3 to 21.0 m (Table 1), and the maximum depth from 3 to 68 m. Most of the lakes had deep areas, which undergo periodic anoxia, generally in winter and during thermal stratification in summer. The values of the anoxic factor (i.e., the product of the duration of anoxia and the percentage of the anaerobic areas) varied from 0 for the nonstratifying lakes (Nürnberg 1984) to 50 d y -1 (Tammeorg et al 2017).…”

Section: Study Areamentioning

confidence: 99%

“…The monitoring data (Finnish Environment Institute) indicated the trophic status ranging from mesotrophic to hypertrophic (Table 1). Mean phosphorus inflow, TPin varied from 104 mg m -2 y -1 in mesotrophic lakes to 910 mg m -2 y -1 in (hyper)eutrophic lakes (Tammeorg et al 2017). The catchments of the eutrophic and hypertrophic lakes have mainly been impacted by agricultural activities (Ekholm and Mitikka 2006).…”

Section: Study Areamentioning

confidence: 99%

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Factors behind the variability of phosphorus accumulation in Finnish lakes

et al. 2018

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Purpose. Phosphorus retention (TPacc) is one of the major water quality regulators in lakes. The current study aimed at ascertaining the specific lake characteristics regulating TPacc. Moreover, we were interested whether NAO (North Atlantic Oscillation), a proxy of climatic forcing, can explain variability in TPacc, additionally to that ascribed to lake characteristics. Materials and methods. Sediment cores were obtained from 21 Finnish lakes, subject to radiometric dating and measurements of TP concentrations. Principal components (PCs) were generated using lake characteristics that are usually included into the modelling of TPacc (e.g., lake area, lake depth, catchment area, P inflow), but also the parameters that the classical models usually missed (e.g., anoxic factor). We used significant principal components (PCs), specific combinations of lake characteristics and monthly NAO values as predictors of TPacc. Results and discussion. Lake characteristics explained the bulk of TPacc variability. The most influential factors (positive drivers) behind TPacc included PC1 (representing mainly deep lakes), PC2 (small lakes with high levels of anoxia and water column stability), PC3 (productive lakes, with large catchment area and short water residence time), PC4 (lakes with high water column stability, low anoxic factor, and relatively high sediment focusing), and PC5 (lakes with high levels of P inflow, anoxia and long water residence time). Additionally, we found a potential negative effect of NAO in October on the annual TPacc. This NAO was significantly positively related to temperatures in surface and near-bottom water layer (also their difference) in autumn, suggesting the possible implications for the internal P dynamics. Increased mineralization of organic matter is the most likely explanation for the reduced TPacc associated with NAO driven water temperature increase. Conclusions. The analysis presented here contributes to the knowledge of the factors controlling P retention. Moreover, this spatially and temporally comprehensive sediment data can potentially be a valuable source for modelling climate change implications.

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“…Adverse changes induced by global warming are crucial mainly for shallow lakes and shallow parts of deeper lakes as well, thus of lesser importance in Lake Durowskie with its steeply sloped lake basin and limited range of epilimnion. Nevertheless, future studies should focus on the shallower northern part of the lake fed by the River Struga Gołaniecka and one more small stream, with a depth less than 5 m, as recent findings suggest that such parts of freshwater reservoirs are considered to be much more important in internal P loading and deterioration of water quality [49]. The northern zone of the lake together with the River Struga Gołaniecka might be responsible for the less well defined results of lake restoration, including fluctuations in TP content at Station II.…”

Section: Phosphorus-oxygen-chlorophyll-a Interactionsmentioning

confidence: 99%

Long-Term Water Quality Changes as a Result of a Sustainable Restoration—A Case Study of Dimictic Lake Durowskie

Dondajewska

Kowalczewska‐Madura

Gołdyn

et al. 2019

Water

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Nature-based solutions in lake restoration enable gradual ecosystem reconstruction without drastic and expensive intervention. Sustainable lake restoration involves limited external interference strong enough to initiate and maintain positive changes in the ecosystem. It was introduced in Lake Durowskie, an urban, flow-through lake situated in Western Poland, using hypolimnetic aeration, phosphorus precipitation with small doses of chemicals and biomanipulation in 2009, and is continued until today. Oxygen conditions in the lake hypolimnion after initial deterioration were gradually improved, and finally a shortening of the duration and range of oxygen deficits was observed. Nitrogen transformations were induced in the hypolimnion by water aeration as well, reducing ammonium N (30% during 2013–2017 in comparison to 2008) and increasing nitrates (90% in 2013–2017 in comparison to 2008). Phosphorus content was diminished (19% during 2015–2017 in relation to 2008 for SRP) due to effective iron-binding and a smaller amount of fresh organic matter being decomposed. Its reduction was related to lower phytoplankton biomass, expressed in a decrease of chlorophyll-a concentrations (55% reduction during 2013–2017 in comparison to 2008) and an increase in water transparency (two-fold during 2013–2017 in relation to 2008) throughout the nine years of treatment. A long-term restoration program, based on non-aggressive, multiple in-lake techniques was applied and, despite the lack of a reduction in total external loading, was able to suppress progressive eutrophication.

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The actual role of oxygen deficit in the linkage of the water quality and benthic phosphorus release: Potential implications for lake restoration

Cited by 47 publications

References 33 publications

Trophic State and Oxygen Conditions of Waters Aerated with Pulverising Aerator: The Results from Seven Lakes in Poland

Trophic State and Oxygen Conditions of Waters Aerated with Pulverising Aerator: The Results from Seven Lakes in Poland

Factors behind the variability of phosphorus accumulation in Finnish lakes

Long-Term Water Quality Changes as a Result of a Sustainable Restoration—A Case Study of Dimictic Lake Durowskie

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