Benthic nutrient fluxes in a eutrophic, polymictic lake

Burger, David F.; Hamilton, David P.; Pilditch, Conrad A.; Gibbs, Max M.

doi:10.1007/s10750-007-0582-0

Cited by 76 publications

(39 citation statements)

References 37 publications

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“…Benthic respiration was coupled to intense NH 4 ? regeneration, with summer rates comparable to those reported for other eutrophic environments, where it can support a relevant fraction of N requirements by primary producers (Nowlin et al 2005;Burger et al 2007). Simultaneously, denitrification efficiency (denitrification : NH 4 ?…”

Section: Metabolism and Internal Processes In Middle Lakesupporting

confidence: 76%

“…Anoxic sediments of eutrophic lakes are generally SRP sources to the water column (Moore et al 1998;Nowlin et al 2005;Burger et al 2007). SRP release was measured only during summer in Middle Lake, probably due to reducing conditions in pore waters, as described by the classical P mobility model (Boström et al 1988).…”

Section: Metabolism and Internal Processes In Middle Lakementioning

confidence: 99%

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Net autotrophy in a fluvial lake: the relative role of phytoplankton and floating-leaved macrophytes

et al. 2011

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This study combined water-and sediment flux measurements with mass balances of dissolved gas and inorganic matter to determine the importance of pelagic and benthic processes for whole-system metabolism in a eutrophic fluvial lake. Mass balances of dissolved O 2 , inorganic carbon (DIC), nitrogen (DIN), phosphorous (SRP), particulate N (PN) and P (PP) and Chl a were calculated at a nearly monthly frequency by means of repeated sampling at the lake inlet and outlet. Simultaneously, benthic fluxes of gas and nutrients, including denitrification rates, and the biomass of the dominant pleustophyte (Trapa natans) were measured, and fluxes of O 2 and CO 2 across the water-atmosphere interface were estimated from diel changes in outlet concentrations. On an annual scale, Middle Lake exhibited CO 2 supersaturation, averaging 313% (range 86-562%), but was autotrophic with a net O 2 production (6.35 ± 2.05 mol m -2 y -1 ), DIC consumption (-31.18 ± 18.77 mol m -2 y -1 ) and net export of Chl a downstream (8.38 ± 0.95 mol C m -2 y -1 ). Phytoplankton was the main driver of Middle Lake metabolism, with a net primary production estimated at 33.24 mol O 2 m -2 y -1 , corresponding to a sequestration of 4.18 and 0.26 mol m -2 y -1 of N and P, respectively. At peak biomass, T. natans covered about 18% of Middle Lake's surface and fixed 2.46, 0.17 and 0.02 mol m -2 of C, N and P, respectively. Surficial sediments were a sink for O 2 (-14.47 ± 0.65 mol O 2 m -2 y -1 ) and a source of DIC and NH 4 ? (18.84 ± 2.80 mol DIC m -2 y -1 and 0.83 ± 0.16 mol NH 4 ? m -2 y -1 ), and dissipated nitrate via denitrification (1.44 ± 0.11 mol NO 3 -m -2 y -1 ). Overall, nutrient uptake by primary producers and regeneration from sediments were a minor fraction of external loads. This work suggests that the creation of fluvial lakes can produce net autotrophic systems, with elevated rates of phytoplanktonic primary production, largely sustained by allochtonous nutrient inputs. These hypereutrophic aquatic bodies are net C sinks, although they simultaneously release CO 2 to the atmosphere.

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Section: Metabolism and Internal Processes In Middle Lakesupporting

confidence: 76%

Section: Metabolism and Internal Processes In Middle Lakementioning

confidence: 99%

Net autotrophy in a fluvial lake: the relative role of phytoplankton and floating-leaved macrophytes

et al. 2011

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“…Fluxes of P in the Miyun Reservoir or other palaces indicated bottom sediment was an important source of P. It takes up 11-89 % of the external P loading (Table 1 and Table 2). Burger et al (2007) also reported that the mean SRP sediment release rate was three times greater than daily external load. Therefore, internal P loading contributes to reservoirs (or lakes) loading significantly.…”

Section: Comparison With Other Regionsmentioning

confidence: 95%

“…In situ flux chambers result in minimal disturbance to the sediment and overlying water (Burger et al 2007), and to some extent, is the optimal way to get realworld results about the internal flux; However, it is also the most costly way to assess internal loading from sediment. In addition, to measure nutrient flux changes over time, the environment inside the chamber should be the same as that outside the chamber, which is the difficult part of the method.…”

Section: Introductionmentioning

confidence: 99%

Estimating internal P loading in a deep water reservoir of northern China using three different methods

Qin

Zeng

Zhang

et al. 2016

Environ Sci Pollut Res

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Much attention had been paid to reducing external loading of nutrients to improve water quality, while internal loading from sediment, which has been largely neglected, is also an important source for water eutrophication. The internal load in deep lakes or reservoirs is not easy to be detected and be quantified. In this study, three different methods (mass balance method, Fick's law, and regression equation) were combined to calculate the gross or/and net P release from sediment using limited data. Our results indicated that (1) ); (2) Hot periods of sediment releasing were suggested to occur from March to April and from August to September, which correspond to periods of high risks of algae blooms. The remaining months of the year were shown as net nutrient retention; (3) for the whole region, Baihedam and Chaohekuqu were identified as zones with a higher possibility to release P from sediment. (4) P loading to the Miyun Reservoir was greater in the inflow than in the outflow, suggesting a portion of the inflow P load was retained in the water or sediment; hence, release of sediment P may continue to be a major source of phosphorus in the future.

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“…Several of the lakes have high internal nutrient loadings as a result of organic enrichment of the bottom sediments and remobilisation of bottom-sediment nutrients with eutrophication-driven depletion of dissolved oxygen in bottom waters (White et al 1978;Burger et al 2007;Trolle et al 2008). Lake Okaro, the focus site of the present study, is the most eutrophic of the Te Arawa lakes.…”

Section: Introductionmentioning

confidence: 94%

Phosphorus dynamics in sediments of a eutrophic lake derived from 31P nuclear magnetic resonance spectroscopy

Özkundakci¹,

Hamilton²,

McDowell³

et al. 2014

Mar. Freshwater Res.

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Abstract. The determination of organic phosphorus (P) compounds in lake sediments can provide information on the potential for internal P loading. Settling seston and vertical sediment core samples from highly eutrophic Lake Okaro, New Zealand, were collected during a mixed winter and stratified summer period, representing, respectively, when the water column was well oxygenated and when the bottom waters were anoxic. Samples were analysed with 31 P nuclear magnetic resonance ( 31 P NMR) spectroscopy, which showed that both bottom sediments and settling seston contained orthophosphate, orthophosphate monoesters and diesters, pyrophosphates, polyphosphates and phosphonates. Phosphorus concentration in settling seston increased ,2.5-fold in winter as a result of seasonally induced changes in phytoplankton biomass, with a marked increase in the concentration of orthophosphate. Several potentially bioavailable P compounds in the bottom sediments were identified that were likely to contribute to recycling of P from the sediment to the water column. An 'apparent half-life' was used to quantify the time scales on which these compounds were recycled to the overlying water column. Orthophosphate monoesters that include inositol phosphates were the most persistent P compound. On the basis of half-lives, high internal P loadings may persist for more than 20 years, potentially hindering restoration efforts in Lake Okaro.

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Benthic nutrient fluxes in a eutrophic, polymictic lake

Cited by 76 publications

References 37 publications

Net autotrophy in a fluvial lake: the relative role of phytoplankton and floating-leaved macrophytes

Net autotrophy in a fluvial lake: the relative role of phytoplankton and floating-leaved macrophytes

Estimating internal P loading in a deep water reservoir of northern China using three different methods

Phosphorus dynamics in sediments of a eutrophic lake derived from 31P nuclear magnetic resonance spectroscopy

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