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Does an ‘iron gate’ carbon preservation mechanism exist in organic–rich wetlands?

dc.contributor.author Richardson, Curtis
dc.contributor.author Wang, Hongjun
dc.contributor.author River, M
dc.date.accessioned 2019-07-01T15:34:48Z
dc.date.available 2019-07-01T15:34:48Z
dc.date.issued 2019-08-01
dc.identifier.issn 0038-0717
dc.identifier.uri https://hdl.handle.net/10161/19061
dc.description.abstract © 2019 Recent research suggested that iron oxidation may protect carbon from drought-accelerated decomposition in wetlands by promoting the sorption of lignin derivatives and decreasing phenolic oxidase activities. Here we examined whether this mechanism exists in organic-rich peatlands, which store over 30% of the world's soil carbon, by simulating drought and flooded conditions in peat soil with and without the addition of reduced iron. Our results suggest that iron does not protect carbon from decomposition in organic-rich peatlands, and in fact iron may exacerbate carbon decomposition via precipitation of phenolic compounds, which otherwise have been shown to inhibit microbial activity. In addition, scanning electron microscopy analyses of different types of peat soil from Minnesota to Peru showed evidence of iron-sulfide minerals (pyrite), indicating that some portion of the reduced iron in peatlands is effectively immobilized and therefore does not interact with the carbon cycle.
dc.language en
dc.publisher Elsevier BV
dc.relation.ispartof Soil Biology and Biochemistry
dc.relation.isversionof 10.1016/j.soilbio.2019.04.011
dc.title Does an ‘iron gate’ carbon preservation mechanism exist in organic–rich wetlands?
dc.type Journal article
duke.contributor.id Richardson, Curtis|0097644
duke.contributor.id Wang, Hongjun|0543445
dc.date.updated 2019-07-01T15:34:47Z
pubs.begin-page 48
pubs.end-page 50
pubs.organisational-group Nicholas School of the Environment
pubs.organisational-group Duke
pubs.organisational-group Environmental Sciences and Policy
pubs.organisational-group Staff
pubs.publication-status Accepted
pubs.volume 135
duke.contributor.orcid Wang, Hongjun|0000-0002-2105-2745


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