Dinitrogen fixation and denitrification in some Danish lakes

Jensen, Vibeke B.; Dahl-Madsen, K. I.

doi:10.1080/03680770.1977.11896852

Cited by 3 publications

(3 citation statements)

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“…We have no direct measurements of N 2 losses to the atmosphere. In average the calculated denitrification rate in Lake Belau is 98 µmol m -2 h -1 N. Jensen and Dahl-Madsen [13] and Jensen et al [14] investigated 58 shallow Danish lakes and observed denitrification rates of 188 µmol m -2 h -1 N. These values and the comprehensive data in Seitzinger [15] reflect that the denitrification rate found in Lake Belau is not exceptional. But the rate is high for a lake of this high average depth.…”

Section: Nitrogen and Phosphorus Budgetsmentioning

confidence: 86%

Nutrient Budgets, Dynamics and Storm Effects in a Eutrophic, Stratified Baltic Lake

Schernewski

2003

Acta hydrochim. hydrobiol.

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Between 1989 and 1998 the small eutrophic stratified Lake Belau was investigated intensively and multidisciplinarily. This article is a short, comprehensive summary and re-evaluation of the hydrochemistry of the lake, with focus on nitrogen and phosphorus. In several aspects the lake can be regarded as a typical example of the glacial north German lakes. The 1960's and 1970's are characterised by heavy nutrient inputs and fast eutrophication. During the last two decades the external nutrient load, especially the phosphorus load into Lake Belau was significantly reduced. But phosphorus-rich sediments and large areas with summerly anoxic sediment surface conditions cause intensive release of phosphorus from older deeper sediment layers. Annual budgets reveal that despite an average sediment accumulation of 3 mm a -1 the lake has lost its function as net phosphorus sink and it is very likely that internal eutrophication by the sediments will keep the lake in its eutrophic state during the next decades. Despite that, monthly budgets of five vertical layers show that the main phosphorus supplier for the phosphorus depleted epilimnion during summer is the creek Alte Schwentine. The annual nitrogen budget indicates groundwater and interflow water as well as atmospheric input as additional important nitrogen sources. 36 % (98 µmol m -2 h -1 N) of all nitrogen input is lost to atmosphere mainly due to denitrification. The example of a heavy storm shows that about 10 % of the annual nitrogen loss to the atmosphere can take place during a single day and in form of ammonia. The storm further made obvious that these unpredictable events can have strong impact on nutrient cycling and ecology in Lake Belau and the lake can become an unexpected nutrient source for downstream systems. Nährstoffbilanz, -dynamik und Sturmeinwirkung in einem eutrophen, geschichteten norddeutschen SeeDer Belauer See war zwischen 1989 und 1998 Gegenstand umfangreicher, interdisziplinä-rer Untersuchungen im Rahmen des Projektes "Ökosystemforschung im Bereich der Bornhöveder Seenkette". Wesentliche Ergebnisse zum Nährstoffhaushalt dieses typischen, glazial geprägten Sees in Ostholstein werden in diesem Artikel kurz zusammengefasst. Nach rascher Eutrophierung in 1960er und 70er Jahren wurden die Nährstoffeinträge seit 1980 deutlich reduziert. Durch anoxische Verhältnisse im sommerlichen Hypolimnion findet eine starke interne Eutrophierung durch Freisetzung aus den alten Sedimenten statt, die den See noch Jahrzehnte in einem eutrophen Zustand halten kann. Darüber hinaus wird die Nährstoffdynamik im See diskutiert sowie die Bedeutung von Einzelereignissen, wie z. B. die eines außergewöhnlichen Sturms im Sommer des Jahres 1989.

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Section: Nitrogen and Phosphorus Budgetsmentioning

confidence: 86%

Nutrient Budgets, Dynamics and Storm Effects in a Eutrophic, Stratified Baltic Lake

Schernewski

2003

Acta hydrochim. hydrobiol.

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“…It has been shown by direct measurements that sedimentation and denitrification represent decisive factors of elimination. Sometimes loss rates of some hundred milligramms per square meter and day were observed (sedimentation: VERDOUW andDEKKERS 1982, MOTHES et al 1986;denitrification: SCJRENSEN 1978, JENSEN andDAHL-MADSEN 1978). The availability of nitrogen for primary production does not only depend on the load but also on internal cycling in the lake, like assimilation and mineralization.…”

Section: Introductionmentioning

confidence: 99%

“…The budget relations have been calculated only for a whole season or the year in total. Attention was especially focussed on a comparison of different lakes on ;L whole-year basis by JENSEN and DAHL-MADSEN (1978), JANSSON et af. (1979), BACH-MANN (1980).…”

Section: Introductionmentioning

confidence: 99%

The Nitrogen Budget of a Shallow Lake (Großer Müggelsee, Berlin)

Dudel¹,

Kohl²

1992

Intl Review of Hydrobiology

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The nitrogen budget of Lake Gr. Müggelsee (mean depth 4.85 m, area 7.12 km2) was calculated from weekly measurements of nitrogen transformations from 1978 to 1984. Common mass balances for nitrogen were completed by determination of dinitrogen fixation in order to calculate denitrification as residual budget component and resolved for distinct seasonal periods. N sedimentation was calculated from internal P balance. Influence of flushing rate on loss processes were analysed by comparison of years with very different runoff. Time series analyses and multiple comparison show a relation of hydraulic flow, nitrate load, in‐lake nitrate and N elimination to the seasonal cycle of irradiance. Denitrification is the most important loss process and exceeds the effect of sedimentation. Other in‐ and outputs (precipitation, swimmers, volatilization) are rather stochastic and of lower quantitative importance. Nitrate leaching from the catchment and turbulent mixing within the lake are discussed as determining factors of in‐lake nitrogen fluxes.

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Contribution of dinitrogen fixation and denitrification to the N-budget of a shallow lake

Dudel¹,

Kohl²

1991

SIL Proceedings, 1922-2010

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Dinitrogen fixation and denitrification in some Danish lakes

Cited by 3 publications

References 1 publication

Nutrient Budgets, Dynamics and Storm Effects in a Eutrophic, Stratified Baltic Lake

Nutrient Budgets, Dynamics and Storm Effects in a Eutrophic, Stratified Baltic Lake

The Nitrogen Budget of a Shallow Lake (Großer Müggelsee, Berlin)

Contribution of dinitrogen fixation and denitrification to the N-budget of a shallow lake

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