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  • 1
    Electronic Resource
    Electronic Resource
    Lake Jabel restoration project: Phosphorus status and possibilities and limitations of diversion of its nutrient-rich main inflow (2000)
    Melbourne, Australia : Blackwell Science Pty
    Lakes & reservoirs 5 (2000), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: External and internal phosphorus loading was studied in 1996 in the anthropogenically eutrophicated Lake Jabel, which is located in Mecklenburg (north-eastern Germany). It has a dimictic 23-m-deep northern basin, a 19-m-deep middle basin and a 6-m-deep polymictic southern basin. The main tributary, Grabowhöfer Grenzgraben, which enters via a leaching field from a waste-water treatment plant, has been identified as the major nutrient discharge (80% of total phosphorus loading) into the northern basin. The sediment is the second largest source of phosphorus for Lake Jabel, contributing 25.7%, 27.4% and 2.4% of the overall phosphorus load to the northern, middle and southern basins, respectively. Although the favoured diversion of the Grabowhöfer Grenzgraben would contribute to a reduction of 1.22 t P and 20.94 t NO3-–-N per year, it is mainly rejected for the following reasons. If the extreme monthly nitrate supply, between 4.84 and 189.6 mg N m-2 day–1 ceased, the release of redox-sensitive phosphorus in the northern basin would increase by a factor of 0.54, which is with 41.1% total phosphorus, twice as high as that in the middle basin. In addition, the nitrate supply can substantially lower the seasonal precipitation of stable iron sulphides, which would otherwise lower the concentration of redox-sensitive phosphorus, but cannot change the phosphorus retention in the long term. Because of internal phosphorus sources, the diversion of the Grabowhöfer Grenzgraben would result in no substantial changes in the level of trophy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1770.2000.00092.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of hypolimnetic discharge on the faster deprivation of phosphorus from lake sediment (Lake Jabel, north-east Germany) (2001)
    Melbourne, Australia : Blackwell Science Asia Pty. Ltd.
    Lakes & reservoirs 6 (2001), S. 0 
    Details
    ISSN: 1440-1770
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography
    Notes: After the reduction in external phosphorus-load (P-load), in-lake measures became practicable for eutrophic Lake Jabel. The benthic release of phosphorus (P) was efficiently suppressed by a significant nitrate supply via its main tributary. The in-situ stimulation of P-release as a result of the temporary decrease in this nitrate load, and the simultaneous P-removal by deep-water siphoning and external P-elimination was primarily designed for the faster deprivation of P from lake sediment. This new strategy was aimed at exhausting the ‘P-surplus’, that is, the mobile redox-sensitive iron-bound P-portions of the uppermost sediment layers, where a re-supply from deeper layers is needed within the stratification period of 2 consecutive years of operation of the P-elimination system. By studying early benthic P-diagenesis it remains to be demonstrated whether this procedure can contribute to a re-availability of P-binding sites to guarantee the long-term effect of the measure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1440-1770.2001.00144.x
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  • 3
    Electronic Resource
    Electronic Resource
    Assessment of the long-term effectiveness of sediment dredging to reduce benthic phosphorus release in shallow Lake Müggelsee (Germany) (1999)
    Springer
    Hydrobiologia 394 (1999), S. 153-161 
    Details
    ISSN: 1573-5117
    Keywords: shallow lake ; sediment dredging ; phosphorus release ; phosphorus speciation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Two series of laboratory experiments mimicking dredging of the uppermost phosphorus (P) rich sediment layers of the shallow eutrophic L. Müggelsee were carried out to study the extent of P release from deeper sediment layers, and changes in P mobility by means of fractional P composition of the in 10 cm steps ‘dredged’ sediment cores. In the first run over 38 days, the aerated controls reached 55%, and the ‘dredged’ cores from 18.1% (−10 cm) down-core to 0.4% (−50 cm) of the non-aerated control (50.82 mg P m−2 d−1 = 100%). In the second run over one year, the fractional P composition in the revealed sediment layers changed slightly. The water-soluble P (H2O-P) increased for the respective ‘dredged’ horizon by between 1.5 and 5.6% TP. The redox-sensitive P (BD-P) increased in each horizon from the intact core to the situation following ‘dredging’, as well as with depth in each horizon from 4.9% TP (−10 cm) to 11.4% TP (−40 cm). The organic bound P portion (NaOH-NRP) decreased least (1.7% TP) in the uppermost layer and most (15.6% TP) in the deepest horizon exposed to water after ‘dredging’. Based on the changes in P pools following dredging at the future sediment–water interface, it is predictable that dredging without reduction of the external loading may give only temporary improvement followed by a slow return to the present situation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003680425229
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  • 4
    Electronic Resource
    Electronic Resource
    In situ phosphorus release experiments in the Warnow River (Mecklenburg, northern Germany) (1993)
    Springer
    Hydrobiologia 253 (1993), S. 263-274 
    Details
    ISSN: 1573-5117
    Keywords: River sediment ; phosphorus release ; phytoplankton collapse ; pH ; nitrate ; oxygen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Results are presented of in situ benthic phosphorus release experiments in an undercut bank of an impounded river. Due to high sedimentation of phytoplankton biomass high oxygen consumption rates between 259.4 and 947.0 mg O2 m−2 d−1 developed, leading to almost anaerobic conditions and phosphorus releases between 175.2 and 236.3 mgP m−2 d−1 over a period of 18 days. In a second series of experiments the water column overlying the sediment was aerated, resulting in much lower P release rates (1.1 to 32.9 mgP m−2 d−1) over a period of 30 days. The influence of pH and nitrate was studied by adjusting pH and adding NO3 − to the overlying water. Increasing pH positively affected P release rates and enhanced NO3 − levels led to an increase of benthic P release, too.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00050747
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  • 5
    Electronic Resource
    Electronic Resource
    Phosphorus release in Lake Groβer Müggelsee and its implications for lake restoration (1997)
    Springer
    Hydrobiologia 342-343 (1997), S. 9-26 
    Details
    ISSN: 1573-5117
    Keywords: shallow lake ; phosphorus release ; lake restoration ; dissolved oxygen ; nitrate ; dredging
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The shallow, hypertrophic L. Großer Müggelsee, Germany,needs to be converted into a meso- to eutrophic level by means ofrestoration of the catchment area. Despite efforts inphosphorus(P) loading reduction in the inflow, this polymictic lakestilldemonstrates an year-to-year fluctuating and strong internal Ploading with increasing pore-water phosphate concentrationsduringsummer due to formation of anoxic microlayers at the sedimentsurface. This P release is indirectly governed by externalfactorsincluding the supply of dissolved oxygen and nitrate viainflow(high runoff), changes in land use (e.g., decreasing nitrogenfertilization) and climatic factors, and is facilitated bywind-induced rapid changes of stratification and mixingevents.Important management implications are: first, declines innitrateconcentrations in the inflow may result in depletion ofelectronacceptors with respect to phosphate desorption and increasethe Prelease. Second, the P release will continue for a long periodandthus delay the recovery of the lake. In dredging the uppermost1 msediment layer, the P content of the sediment would decreasefrom3.5 to between 0.5 and 1.0 mg P g dry weight−1and result inreduced capability of internal P loading. Because of the highcosts, a decision should be made about dredging or whether thelimnological improvement of the lake can be achieved viadephosphorization between 11 and 16 years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017079029053
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  • 6
    Electronic Resource
    Electronic Resource
    The Quantification of Sulfate Reduction in Sulfate-Rich Freshwater Lakes - A Means for Predicting the Eutrophication Process of Acidic Mining Lakes? (1998)
    Springer
    Water, air & soil pollution 108 (1998), S. 365-374 
    Details
    ISSN: 1573-2932
    Keywords: acidic mining lake ; sulfate reduction ; alkalinity generation ; in-lake neutralisation ; internal phosphorus loading ; eutrophication
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A comparison of neutral freshwater lakes and acidic coal mining lakes with respect to both, in-lake alkalinity generation and P mobilization, has been made to predict the extent of the possibility of P remobilisation in acidic mining lakes creating eutrophication. It is hypothesized that the maturing process of an acid mining lake is comparable to the recent history of the increasing productivity observed in SO42--rich freshwater lakes. This hypothesis is based on the observation that (1) with rising pH over time the atomic S:Fe ratio in the acidic waters is increasing because only a fraction of the SO42--S but nearly all Fe is usually buried in the sediment; (2) the potential of their sediments to immobilize P is at present linked to its continuous accumulation at the sediment together with the stock of its binding partners, mainly Fe(III) compounds; (3) the input of organic matter stimulating the SO42- reduction and the formation of insoluble complexes of sulfide with ferrous Fe will enhance not only the generation of alkalinity, but will also increase the mobility and release of P.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005194404417
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  • 7
    Electronic Resource
    Electronic Resource
    Interactions between benthic phosphorus release and sulfur cycling in lake scharmützelsee (Germany) (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 391-399 
    Details
    ISSN: 1573-2932
    Keywords: sulfate reduction phosphorus release ; sulfur speciafon ; phosphorus tiactionation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Sulfur (S) conversions were determined during summer stratification in 1995/96 to assess the extent to which benthic release of phosphorus (P) is influenced by the S cycling in eutrophic, dimictic, sulfate-rich (61.33 ± 10.41 mg SO4 2−1−1) freshwater Lake Schammützelsee. Hypolimnetic SO4 2− reduction (4.56 ± 0.73 g (S) M−2 d−1) forming ΣH2S (44.71 ± 17.57 mg ΣH2S m−2 d−1), leading to iron sulfide precipitation (5.62 ± 1.72 mg FeS m2 d−1) and dissolved iron depletion in the hypolimnion has a major influence on benthic P mobilization and release. The most important inorganic S pool is the CRS (FeS2 + S° + H2S; 15.1% total S), being 1.3 to 6.6 times higher than the AVS (FeS + H2S) in the uppermost 0 − 8 urn sediment. This diminishes the ability of the sediment to bind P (indicated by 14.6 % loosely bound P (NH4CI-P) and an exhaustion ofthe redox-sensitive P (BD-P)), leading to interstitial water P concentrations up to 10.8 mg 1−1 and P release rates of 2.64 t 0.56 mg P m−2 d−1. As a consequence the P content ofthe lake increased fourtfold within 58 days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02406879
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  • 8
    Electronic Resource
    Electronic Resource
    Interactions Between Benthic Phosphorus Release and Sulfur Cycling in Lake Scharmützelsee (Germany) (1997)
    Springer
    Water, air & soil pollution 99 (1997), S. 391-399 
    Details
    ISSN: 1573-2932
    Keywords: sulfate reduction ; phosphorus release ; sulfur speciation ; phosphorus fractionation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Sulfur (S) conversions were determined during summer stratification in 1995/96 to assess the extent to which benthic release of phosphorus (P) is influenced by the S cycling in eutrophic, dimictic, sulfate-rich (61.33 ± 10.41 mg SO42- l-1) freshwater Lake Schamützelsee. Hypolimnetic SO42- reduction (4.56 ± 0.73 g (S) m-2 d-1) forming ΣH2S (44.71 ± 17.57 mg ΣH2S m-2 d-1), leading to iron sulfide precipitation (5.62 ± 1.72 mg FeS m-2 d-1) and dissolved iron depletion in the hypolimnion has a major influence on benthic P mobilization and release. The most important inorganic S pool is the CRS (FeS2 + S° + H2S; 15.1 % total S), being 1.3 to 6.6 times higher than the AVS (FeS + H2S) in the uppermost 0 - 8 cm sediment. This diminishes the ability of the sediment to bind P (indicated by 14.6 % loosely bound P (NH4Cl-P) and an exhaustion of the redox-sensitive P (BD-P)), leading to interstitial water P concentrations up to 10.8 mg l-1 and P release rates of 2.64 ± 0.56 mg P m-2 d-1. As a consequence the P content of the lake increased fourfold within 58 days.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018383221469
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  • 9
    Electronic Resource
    Electronic Resource
    Surficial sediment composition as a record of environmental changes in the catchment of shallow Lake Petersdorf, Brandenburg, Germany (1999)
    Springer
    Hydrobiologia 408-409 (1999), S. 185-192 
    Details
    ISSN: 1573-5117
    Keywords: shallow lake ; sediment ; dy ; phosphorus ; calcium ; metals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A chemical characterization of the surficial sediment (0–20 cm) of type `dy' (org-Cpart/TNpart〉10) of the anthropogenically polluted shallow Lake Petersdorf is presented. Eighty samples were analyzed for a set of parameters, i.e. dry weight, loss on ignition (LOI), total inorganic carbon (TIC), N, S, P, Ca, Si, As, Fe, Al, Mn, Zn, Cd, and Pb. LOI, TIC, N, S, Ca, P, and Zn tend to accumulate at a water depth 〉2 m (70.6% of the lake surface) in contrast to Mn and Fe which are more widely distributed, and Cd and Pb which are accumulated in the lake part close to a road. The enrichment factors of certain elements, e.g. Al (23.9%), Si (31.5%), P (12.2%), and Ca (68.7%) from 20 cm sediment depth up to the surface, are attributed to incisive changes in the immediate catchment. Erosion, fertilization, amelioration, and separation of the peatland north of the lake by a dam within the last 60 yrs resulted in the change of Lake Petersdorf from a dystrophic to a eutrophic stage. This enhanced the mineralization of its meso-humic (LOI/TNpart=20.6) sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017059330528
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  • 10
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    Quantification of phosphorus entrainment in a lowland river by in situ and laboratory resuspension experiments (2008)
    Springer
    Details
    Publication Date: 2008-03-14
    Print ISSN: 1015-1621
    Electronic ISSN: 1420-9055
    Topics: Biology
    Published by Springer
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