Oxygen and dissolved organic carbon control release of N, P and Fe from the sediments of a shallow, polymictic lake

Mueller, S; Mitrovic, SM; Baldwin, DSB

Oxygen and dissolved organic carbon control release of N, P and Fe from the sediments of a shallow, polymictic lake

Mueller, S Mitrovic, SM Baldwin, DSB

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Publisher:: Springer
Publication Type:: Journal Article
Citation:: Journal of Soils and Sediments, 2016, 16, (3), pp. 1109-1120
Issue Date:: 2016-03

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Field	Value	Language
dc.contributor.author	Mueller, S
dc.contributor.author	Mitrovic, SM
dc.contributor.author	Baldwin, DSB
dc.date.accessioned	2022-03-21T05:09:20Z
dc.date.available	2015-10-25
dc.date.available	2022-03-21T05:09:20Z
dc.date.issued	2016-03
dc.identifier.citation	Journal of Soils and Sediments, 2016, 16, (3), pp. 1109-1120
dc.identifier.issn	1614-7480
dc.identifier.issn	1614-7480
dc.identifier.uri	http://hdl.handle.net/10453/155427
dc.description.abstract	Purpose We examined potential causes of nutrient release from the sediments of a shallow polymictic reservoir that, unlike many other shallow lakes, had not received large amounts of nutrient loading. It was hypothesised that the sediments released greater amounts of nutrients under anoxic rather than oxic conditions and that nitrogen (N) and phosphorus (P) release was limited by the availability of different types of organic substrate. Materials and methods Sediment incubation experiments under oxic and anoxic conditions were conducted in summer and in winter. One anoxic incubation experiment with the addition of different types of dissolved organic substrate (glucose, acetate, formate and propionate) was carried out. Concentrations of nitrite and nitrate (NOx −-N), ammonium (NH4 +-N), soluble reactive P (srP) and iron (Fe(II)) were monitored in the supernatant of the incubation chambers over 28 days. Thermal stratification was monitored in situ for 17 months and sediment composition was analysed. Results and discussion NOx −-N concentration increased by 5.67±0.33 mg N l−1 in anoxic conditions but was much lower in oxic treatments. Release of srP was low in anoxic and oxic treatments (0.004±0.001 mg P l−1) but was stimulated by 0.027±0.015 mg P l−1 under additions of formate. Fe(II) release was mostly stimulated by glucose additions (25.59± 4.28 mg Fe l−1). P release was much lower than observed in eutrophic lakes. P release does not appear to be as a result of the reduction of Fe minerals and concurrent dissolution of orthophosphate, often reported as the most prevalent pathway for P release from anaerobic lake sediments. Conclusions Iron and P flux from lake sediments can be independent from each other and can be controlled by dissolved organic C. Further, the study confirms the role of oxygen availability in controlling nutrient release from the sediments.
dc.language	English
dc.publisher	Springer
dc.relation.ispartof	Journal of Soils and Sediments
dc.relation.isbasedon	10.1007/s11368-015-1298-9
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	04 Earth Sciences, 05 Environmental Sciences, 07 Agricultural and Veterinary Sciences
dc.subject.classification	Environmental Sciences
dc.title	Oxygen and dissolved organic carbon control release of N, P and Fe from the sediments of a shallow, polymictic lake
dc.type	Journal Article
utslib.citation.volume	16
utslib.for	060204 Freshwater Ecology
utslib.for	04 Earth Sciences
utslib.for	05 Environmental Sciences
utslib.for	07 Agricultural and Veterinary Sciences
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	closed_access	*
pubs.consider-herdc	true
dc.date.updated	2022-03-21T05:09:18Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	16
utslib.citation.issue	3

Abstract:

Purpose We examined potential causes of nutrient release from the sediments of a shallow polymictic reservoir that, unlike many other shallow lakes, had not received large amounts of nutrient loading. It was hypothesised that the sediments released greater amounts of nutrients under anoxic rather than oxic conditions and that nitrogen (N) and phosphorus (P) release was limited by the availability of different types of organic substrate. Materials and methods Sediment incubation experiments under oxic and anoxic conditions were conducted in summer and in winter. One anoxic incubation experiment with the addition of different types of dissolved organic substrate (glucose, acetate, formate and propionate) was carried out. Concentrations of nitrite and nitrate (NOx −-N), ammonium (NH4 +-N), soluble reactive P (srP) and iron (Fe(II)) were monitored in the supernatant of the incubation chambers over 28 days. Thermal stratification was monitored in situ for 17 months and sediment composition was analysed. Results and discussion NOx −-N concentration increased by 5.67±0.33 mg N l−1 in anoxic conditions but was much lower in oxic treatments. Release of srP was low in anoxic and oxic treatments (0.004±0.001 mg P l−1) but was stimulated by 0.027±0.015 mg P l−1 under additions of formate. Fe(II) release was mostly stimulated by glucose additions (25.59± 4.28 mg Fe l−1). P release was much lower than observed in eutrophic lakes. P release does not appear to be as a result of the reduction of Fe minerals and concurrent dissolution of orthophosphate, often reported as the most prevalent pathway for P release from anaerobic lake sediments. Conclusions Iron and P flux from lake sediments can be independent from each other and can be controlled by dissolved organic C. Further, the study confirms the role of oxygen availability in controlling nutrient release from the sediments.

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