High spatial resolution of distribution and interconnections between Fe- and N-redox processes in profundal lake sediments

Emily D. Melton, Peter Stief, Sebastian Behrens, Andreas Kappler, Caroline Schmidt*

*Kontaktforfatter for dette arbejde

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Resumé

Summary: The Fe and N biogeochemical cycles play key roles in freshwater environments. We aimed to determine the spatial positioning and interconnections of the N and Fe cycles in profundal lake sediments. The gradients of O2, NO3 -, NH4 +, pH, Eh, Fe(II) and Fe(III) were determined and the distribution of microorganisms was assessed by most probable numbers and quantitative polymerase chain reaction. The redox zones could be divided into an oxic zone (0-8mm), where microaerophiles (Gallionellaceae) were most abundant at a depth of 7mm. This was followed by a denitrification zone (6-12mm), where NO3 --dependent Fe(II) oxidizers and organoheterotrophic denitrifiers both reduce nitrate. Lastly, an iron redox transition zone was identified at 12.5-22.5mm. Fe(III) was most abundant above this zone while Fe(II) was most abundant beneath. The high abundance of poorly crystalline iron suggested iron cycling. The Fe and N cycles are biologically connected through nitrate-reducing Fe(II) oxidizers and chemically by NOx - species formed during denitrification, which can chemically oxidize Fe(II). This study combines high resolution chemical, molecular and microbiological data to pinpoint sedimentary redox zones in which Fe is cycled between Fe(II) and Fe(III) and where Fe and N-redox processes interact.

OriginalsprogEngelsk
TidsskriftEnvironmental Microbiology
Vol/bind16
Udgave nummer10
Sider (fra-til)3287-3303
Antal sider17
ISSN1462-2912
DOI
StatusUdgivet - 1. jan. 2014
Udgivet eksterntJa

Fingeraftryk

Lakes
lacustrine deposit
spatial resolution
iron
oxidants
denitrification
lakes
sediments
Iron
Gallionellaceae
nitrates
biogeochemical cycles
nitrate
quantitative polymerase chain reaction
Fresh Water
freshwater environment
biogeochemical cycle
microorganisms
transition zone
polymerase chain reaction

Citer dette

Melton, Emily D. ; Stief, Peter ; Behrens, Sebastian ; Kappler, Andreas ; Schmidt, Caroline. / High spatial resolution of distribution and interconnections between Fe- and N-redox processes in profundal lake sediments. I: Environmental Microbiology. 2014 ; Bind 16, Nr. 10. s. 3287-3303.
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High spatial resolution of distribution and interconnections between Fe- and N-redox processes in profundal lake sediments. / Melton, Emily D.; Stief, Peter; Behrens, Sebastian; Kappler, Andreas; Schmidt, Caroline.

I: Environmental Microbiology, Bind 16, Nr. 10, 01.01.2014, s. 3287-3303.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - High spatial resolution of distribution and interconnections between Fe- and N-redox processes in profundal lake sediments

AU - Melton, Emily D.

AU - Stief, Peter

AU - Behrens, Sebastian

AU - Kappler, Andreas

AU - Schmidt, Caroline

PY - 2014/1/1

Y1 - 2014/1/1

N2 - Summary: The Fe and N biogeochemical cycles play key roles in freshwater environments. We aimed to determine the spatial positioning and interconnections of the N and Fe cycles in profundal lake sediments. The gradients of O2, NO3 -, NH4 +, pH, Eh, Fe(II) and Fe(III) were determined and the distribution of microorganisms was assessed by most probable numbers and quantitative polymerase chain reaction. The redox zones could be divided into an oxic zone (0-8mm), where microaerophiles (Gallionellaceae) were most abundant at a depth of 7mm. This was followed by a denitrification zone (6-12mm), where NO3 --dependent Fe(II) oxidizers and organoheterotrophic denitrifiers both reduce nitrate. Lastly, an iron redox transition zone was identified at 12.5-22.5mm. Fe(III) was most abundant above this zone while Fe(II) was most abundant beneath. The high abundance of poorly crystalline iron suggested iron cycling. The Fe and N cycles are biologically connected through nitrate-reducing Fe(II) oxidizers and chemically by NOx - species formed during denitrification, which can chemically oxidize Fe(II). This study combines high resolution chemical, molecular and microbiological data to pinpoint sedimentary redox zones in which Fe is cycled between Fe(II) and Fe(III) and where Fe and N-redox processes interact.

AB - Summary: The Fe and N biogeochemical cycles play key roles in freshwater environments. We aimed to determine the spatial positioning and interconnections of the N and Fe cycles in profundal lake sediments. The gradients of O2, NO3 -, NH4 +, pH, Eh, Fe(II) and Fe(III) were determined and the distribution of microorganisms was assessed by most probable numbers and quantitative polymerase chain reaction. The redox zones could be divided into an oxic zone (0-8mm), where microaerophiles (Gallionellaceae) were most abundant at a depth of 7mm. This was followed by a denitrification zone (6-12mm), where NO3 --dependent Fe(II) oxidizers and organoheterotrophic denitrifiers both reduce nitrate. Lastly, an iron redox transition zone was identified at 12.5-22.5mm. Fe(III) was most abundant above this zone while Fe(II) was most abundant beneath. The high abundance of poorly crystalline iron suggested iron cycling. The Fe and N cycles are biologically connected through nitrate-reducing Fe(II) oxidizers and chemically by NOx - species formed during denitrification, which can chemically oxidize Fe(II). This study combines high resolution chemical, molecular and microbiological data to pinpoint sedimentary redox zones in which Fe is cycled between Fe(II) and Fe(III) and where Fe and N-redox processes interact.

U2 - 10.1111/1462-2920.12566

DO - 10.1111/1462-2920.12566

M3 - Journal article

C2 - 25041287

AN - SCOPUS:84907875567

VL - 16

SP - 3287

EP - 3303

JO - Environmental Microbiology

JF - Environmental Microbiology

SN - 1462-2912

IS - 10

ER -