High variability in iron-bound organic carbon among five boreal lake sediments

High variability in iron-bound organic carbon among five boreal lake sediments Being both stable carbon sinks and greenhouse gas sources, boreal lake sediments represent significant players in carbon (C) cycling. The release of dissolved organic carbon (DOC) into anoxic water is a widespread phenomenon in boreal lakes with impact on sediment C budgets. The association of OC with iron (Fe) is assumed to play an important role for this anoxic OC release via the dissimilatory reduction of Fe, but also to influence the stabilization of OC in sediments. To investigate the role of Fe–OC association for OC dynamics in different boreal lake sediments, we compared the content of Fe-bound OC [Fe–OC, defined as citrate bicarbonate dithionite (CBD) extractable OC] and the extent of reductive dissolution of solid-phase Fe and OC at anoxia. We found high among-lake variability in Fe–OC content, and while the amount of Fe–OC was high in three of the lakes (980–1920 µmol g−1), the overall contribution of Fe–OC to the sediment OC pool in all study lakes was not higher than 11%. No linkages between the amount of the Fe–OC pool and lake or sediment characteristics (e.g., pH, DOC concentration, sediment OC content, C:N ratio) could be identified. The observed release of OC from anoxic sediment may be derived from dissolution of Fe–OC in the lake sediments with high Fe–OC, but in other lake sediments, OC release during anoxia exceeded the sediment Fe–OC pool, indicating low contribution of reductive Fe dissolution to OC release from these lake sediments. The range of the investigated boreal lakes reflects the high variability in the size of the sediment Fe–OC pool (0–1920 µmol g−1) and CBD-extractable Fe (123–4050 µmol g−1), which was not mirrored in the extent of reductive dissolution of Fe (18.9–84.6 µmol g−1) and OC (1080–1700 µmol g−1) during anoxia, suggesting that Fe-bound OC may play a minor role for sediment OC release in boreal lakes. However, studies of redox-related OC cycling in boreal lake sediments should consider that the amount of Fe–OC can be high in some lakes. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Biogeochemistry Springer Journals

High variability in iron-bound organic carbon among five boreal lake sediments

Peter, Simone; Sobek, Sebastian
Biogeochemistry, Volume 139 (1) – May 29, 2018
11 pages
Read Article

Loading next page...
 
/lp/springer_journal/high-variability-in-iron-bound-organic-carbon-among-five-boreal-lake-25O4dKSBn3
Publisher
Springer Journals
Copyright
Copyright © 2018 by Springer International Publishing AG, part of Springer Nature
Subject
Earth Sciences; Biogeosciences; Ecosystems; Environmental Chemistry; Life Sciences, general
ISSN
0168-2563
eISSN
1573-515X
D.O.I.
10.1007/s10533-018-0456-8
Publisher site
See Article on Publisher Site

Abstract

Being both stable carbon sinks and greenhouse gas sources, boreal lake sediments represent significant players in carbon (C) cycling. The release of dissolved organic carbon (DOC) into anoxic water is a widespread phenomenon in boreal lakes with impact on sediment C budgets. The association of OC with iron (Fe) is assumed to play an important role for this anoxic OC release via the dissimilatory reduction of Fe, but also to influence the stabilization of OC in sediments. To investigate the role of Fe–OC association for OC dynamics in different boreal lake sediments, we compared the content of Fe-bound OC [Fe–OC, defined as citrate bicarbonate dithionite (CBD) extractable OC] and the extent of reductive dissolution of solid-phase Fe and OC at anoxia. We found high among-lake variability in Fe–OC content, and while the amount of Fe–OC was high in three of the lakes (980–1920 µmol g−1), the overall contribution of Fe–OC to the sediment OC pool in all study lakes was not higher than 11%. No linkages between the amount of the Fe–OC pool and lake or sediment characteristics (e.g., pH, DOC concentration, sediment OC content, C:N ratio) could be identified. The observed release of OC from anoxic sediment may be derived from dissolution of Fe–OC in the lake sediments with high Fe–OC, but in other lake sediments, OC release during anoxia exceeded the sediment Fe–OC pool, indicating low contribution of reductive Fe dissolution to OC release from these lake sediments. The range of the investigated boreal lakes reflects the high variability in the size of the sediment Fe–OC pool (0–1920 µmol g−1) and CBD-extractable Fe (123–4050 µmol g−1), which was not mirrored in the extent of reductive dissolution of Fe (18.9–84.6 µmol g−1) and OC (1080–1700 µmol g−1) during anoxia, suggesting that Fe-bound OC may play a minor role for sediment OC release in boreal lakes. However, studies of redox-related OC cycling in boreal lake sediments should consider that the amount of Fe–OC can be high in some lakes.

Journal

Biogeochemistry – Springer Journals

Published: May 29, 2018

References

  • The Bastnäs-type REE-mineralisations in north-western Bergslagen, Sweden
    Andersson, UB
  • Degradation of dissolved organic matter in oxic and anoxic lake water
    Bastviken, D; Persson, L; Odham, G; Tranvik, LJ
  • Freshwater methane emissions offset the continental carbon sink
    Bastviken, D; Tranvik, LJ; Downing, JA; Crill, PM; Enrich-Prast, A
  • Biodegradation of synthetic organo-metallic complexes of iron and aluminium with selected metal to carbon ratios
    Boudot, J
  • Thermodynamically controlled preservation of organic carbon in floodplains
    Boye, K; Noël, V; Tfaily, MM; Bone, SE; Williams, KH; Bargar, JR; Fendorf, S
  • A feedback loop links brownification and anoxia in a temperate, shallow lake
    Brothers, S
  • Mobilization of colloidal carbon during iron reduction in basaltic soils
    Buettner, SW; Kramer, MG; Chadwick, OA; Thompson, A
  • Influences of iron, manganese, and dissolved organic carbon on the hypolimnetic cycling of amended mercury
    Chadwick, SP; Babiarz, CL; Hurley, JP; Armstrong, DE
  • Abundance and properties of dissolved organic matter in pore waters of a freshwater wetland
    Chin, Y-P; Traina, SJ; Swank, CR; Backhus, D
  • Uncoupled organic matter burial and quality in boreal lake sediments over the Holocene
    Chmiel, HE; Niggemann, J; Kokic, J; Ferland, MÈ; Dittmar, T; Sobek, S
  • Plumbing the global carbon cycle: integrating inland waters into the terrestrial carbon budget
    Cole, JJ
  • Benthic dissolved organic carbon fluxes in a drinking water reservoir
    Dadi, T; Friese, K; Wendt‐Potthoff, K; Koschorreck, M
  • Linking organic carbon sedimentation, burial efficiency, and long-term accumulation in boreal lakes
    Ferland, ME; Prairie, YT; Teodoru, C; Giorgio, PA
  • Depth-dependent molecular composition and photo-reactivity of dissolved organic matter in a boreal lake under winter and summer conditions
    Gonsior, M; Schmitt-Kopplin, P; Bastviken, D
  • Increasing pH drives organic matter solubilization from wetland soils under reducing conditions
    Grybos, M; Davranche, M; Gruau, G; Petitjean, P; Pédrot, M
  • Influence of sorption on the biological utilization of two simple carbon substrates
    Jones, D; Edwards, A
  • Sorptive preservation of labile organic-matter in marine-sediments
    Keil, RG; Montlucon, DB; Prahl, FG; Hedges, JI
  • Mineral-organic associations: formation, properties, and relevance in soil environments
    Kleber, M; Eusterhues, K; Keiluweit, M; Mikutta, C; Mikutta, R; Nico, PS
  • In-lake processes offset increased terrestrial inputs of dissolved organic carbon and color to lakes
    Köhler, SJ; Kothawala, D; Futter, MN; Liungman, O; Tranvik, L
  • A large carbon pool and small sink in boreal Holocene lake sediments
    Kortelainen, P; Pajunen, H; Rantakari, M; Saarnisto, M
  • Sediment respiration and lake trophic state are important predictors of large CO2 evasion from small boreal lakes
    Kortelainen, P
  • Increasing iron concentrations in surface waters—a factor behind brownification?
    Kritzberg, E; Ekström, S
  • Preservation of organic matter in sediments promoted by iron
    Lalonde, K; Mucci, A; Ouellet, A; Gélinas, Y
  • Weak coupling between community composition and functioning of aquatic bacteria
    Langenheder, S; Lindström, ES; Tranvik, LJ
  • Release and cycling of nutrients between planktonic algae and herbivores
    Lehman, JT
  • Bacterioplankton community composition in five lakes differing in trophic status and humic content
    Lindström, ES
  • Enhanced carbon loss from anoxic lake sediment through diffusion of dissolved organic carbon
    Peter, S; Isidorova, A; Sobek, S
  • Widespread release of dissolved organic carbon from anoxic boreal lake sediments
    Peter, S; Agstam, O; Sobek, S
  • Development of a sequential extraction procedure for iron: implications for iron partitioning in continentally derived particulates
    Poulton, SW; Canfield, DE
  • The effect of induced anoxia and reoxygenation on benthic fluxes of organic carbon, phosphate, iron, and manganese
    Skoog, AC; Arias-Esquivel, VA
  • Manganese, iron and sulfur cycling in a coastal marine sediment, Aarhus Bay, Denmark
    Thamdrup, B; Fossing, H; Jørgensen, BB
  • Seasonal variations in the concentrations of humic substances in a soft-water lake
    Tipping, E; Woof, C
  • Al(III) and Fe(III) binding by humic substances in freshwaters, and implications for trace metal speciation
    Tipping, E; Rey-Castro, C; Bryan, SE; Hamilton-Taylor, J
  • The ferrozine method revisited: Fe(II)/Fe(III) determination in natural waters
    Viollier, E; Inglett, P; Hunter, K; Roychoudhury, A; Cappellen, P
  • Sedimentation in boreal lakes—the role of flocculation of allochthonous dissolved organic matter in the water column
    Wachenfeldt, E; Tranvik, LJ
  • Sorptive stabilization of organic matter in soils by hydrous iron oxides
    Wagai, R; Mayer, LM
  • Browning of boreal freshwaters coupled to carbon–iron interactions along the aquatic continuum
    Weyhenmeyer, GA; Prairie, YT; Tranvik, LJ

You’re reading a free preview. Subscribe to read the entire article.

Try 2 weeks free now

DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

or browse the journals available

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create folders to
organize your research

Export folders, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off

Sign up
for free
Start 14 day
Free Trial