Reaction of large and shallow lakes Peipsi and Võrtsjärv to the changes of nutrient loading

Nõges, Tiina; Järvet, Arvo; Kisand, Anu; Laugaste, Reet; Loigu, Enn; Skakalski, Boris; Nõges, Peeter

doi:10.1007/978-1-4020-6399-2_23

Cited by 11 publications

(15 citation statements)

References 20 publications

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“…Leaching of nutrients can continue for a long time after reduced fertilization because of the soil's capacity to retain nutrients. Mourad et al, 2006Mourad et al, 1980Mourad et al, -1991 11 770 294 Nõges et al, 2007Nõges et al, 1995Nõges et al, -1999 7 706 187 Mourad et al, 2006Mourad et al, 1992Mourad et al, -2004 7 124 256 Nõges et al, 2007Nõges et al, 2001Nõges et al, -2005 6 328 195 Loigu et al, 2008Loigu et al, 1992Loigu et al, -2007 5 600 179…”

Section: Discussionmentioning

confidence: 95%

Nitrogen and phosphorus in Estonian rivers discharging into Lake Peipsi: estimation of loads and seasonal and spatial distribution of concentrations

Buhvestova

Kangur²,

Haldna³

et al. 2011

Estonian J. Ecol.

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Our study aims to estimate the riverine loads of nutrients to Lake Peipsi sensu stricto and to assess their effect on the lake's water quality. The data of national monitoring of 1992-2007 were used for the determination of seasonal and spatial distribution of nitrogen and phosphorus in the rivers discharging into Lake Peipsi s.s. Statistical conclusions and tests were based on a multiparametric model. Our calculations revealed that the major Estonian rivers discharged approximately 5600 tonnes of nitrogen and 179 tonnes of phosphorus annually to Lake Peipsi s.s. Nitrogen export coefficients varied from 4 to 8 kg N ha -1 yr -1 , while the range of P losses was from 0.12 to 0.21 kg P ha -1 yr -1 . Seasonal variation in nitrogen concentrations had a sinusoidal pattern, with high concentrations during winter and spring and low values in summer, whereas phosphorus dynamics created a slightly different picture, with a much more irregular variation and a smaller amplitude over the year. Only a few rivers showed a pattern of notably higher phosphorus concentrations during summer low flows and more diluted concentrations during winter and spring. The differences in the concentration of phosphorus were mainly explained by variation in water discharge, while the availability of nitrogen in rivers was determined rather by seasonality. Nutrient concentrations in rivers discharging into Lake Peipsi are probably still influenced by nutrient stores from the period of intensive fertilization. Although a local effect of nitrogen loads on the lake's water quality was detected, the concentration of phosphorus in lake water remained insensitive to year-to-year changes in the riverine load of phosphorus.

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Section: Discussionmentioning

confidence: 95%

Nitrogen and phosphorus in Estonian rivers discharging into Lake Peipsi: estimation of loads and seasonal and spatial distribution of concentrations

Buhvestova

Kangur²,

Haldna³

et al. 2011

Estonian J. Ecol.

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“…1a). The lake is eutrophic, characterised by the following mean concentrations: total phosphorus (TP) 54 μg l , chlorophyll-a 24 μg l −1 (Tuvikene et al 2004;Nõges et al 2007), and typically has a Secchi depth of less than 1 m.…”

Section: Study Sitementioning

confidence: 99%

Atmospheric stilling leads to prolonged thermal stratification in a large shallow polymictic lake

et al. 2017

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To quantify the effects of recent and potential future decreases in surface wind speeds on lake thermal stratification, we apply the one-dimensional process-based model MyLake to a large, shallow, polymictic lake, Võrtsjärv. The model is validated for a 3-year period and run separately for 28 years using long-term daily atmospheric forcing data from a nearby meteorological station. Model simulations show exceptionally good agreement with observed surface and bottom water temperatures during the 3-year period. Similarly, simulated surface water temperatures for 28 years show remarkably good agreement with long-term in situ water temperatures. Sensitivity analysis demonstrates that decreasing wind speeds has resulted in substantial changes in stratification dynamics since 1982, while increasing air temperatures during the same period had a negligible effect. Atmospheric stilling is a phenomenon observed globally, and in addition to recent increases in surface air temperature, needs to be considered when evaluating the influence of climate change on lake ecosystems.

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“…However, compared with other studies, including shallow eutrophic lakes in northern Europe [11][12][13], New Zealand [14] and Estonia and Russia [15], phosphorus and nitrogen in sediments are still low. This may be caused by the large surface area of BMR.…”

Section: -P4mentioning

confidence: 67%

Nutrient Concentration Distribution in Sediment and Overlying Water at Bukit Merah Reservoir, Perak

Talib

Yusoff

Hasan

et al. 2016

MATEC Web of Conferences

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Abstract. Bukit Merah Reservoir (BMR) is the oldest reservoir in Malaysia constructed to supply irrigation water to the Kerian Irrigation Scheme. Depletion of storage capacity due to sedimentation process is the most concerning issue of the reservoir recently. Sediment analysis is also very important when monitoring the substances that appear in the reservoir water. Environmental toxins, like heavy metals and hydrophobic organic components, as well as nutrients such as nitrogen and phosphorus are readily bond to the particulate matter. Factors in the reservoir that affect the particulate matter will aid the distribution of contaminants in the sediments. The contaminants in the sediments could have higher concentrations compared to those found in the overlying water. This means that the sediment plays an important role in the cycling of nutrients and distribution of contaminants in the ecosystem. The objectives of this research are to determine the relationship of nutrient and heavy metal content for sediment and overlying water. Nutrient profile information is provided from sediment sample analysis. Based on the data from the horizontal distribution of surface sediment phosphorus in BMR, it was apparent that the highest concentration occurred in the reservoir inlet from Sungai Kurau catchment area. Phosphorus and nitrogen in BMR have a similar trend of decreasing concentration from upstream to downstream. The phosphorus and nitrogen concentrations of surface sediment were in fact significantly correlated with phosphorus and nitrogen concentrations of surface water because of the high value of determination of correlation (R 2 ). As a conclusion, the deposition of sediments was found to bring along external nutrients. Variability of phosphorus and nitrogen concentrations in the sediment directly affects the quality of water which is very important for irrigation and domestic uses.

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Reaction of large and shallow lakes Peipsi and Võrtsjärv to the changes of nutrient loading

Cited by 11 publications

References 20 publications

Nitrogen and phosphorus in Estonian rivers discharging into Lake Peipsi: estimation of loads and seasonal and spatial distribution of concentrations

Nitrogen and phosphorus in Estonian rivers discharging into Lake Peipsi: estimation of loads and seasonal and spatial distribution of concentrations

Atmospheric stilling leads to prolonged thermal stratification in a large shallow polymictic lake

Nutrient Concentration Distribution in Sediment and Overlying Water at Bukit Merah Reservoir, Perak

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