Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/131086
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Type: Journal article
Title: Porosity and organic matter distribution in jarositic phyto tubules of sulfuric soils assessed by combined µCT and NanoSIMS analysis
Author: Pohl, L.
Kölbl, A.
Uteau, D.
Peth, S.
Häusler, W.
Mosley, L.
Marschner, P.
Fitzpatrick, R.
Kögel-Knabner, I.
Citation: Geoderma, 2021; 399:115124-1-115124-10
Publisher: Elsevier
Issue Date: 2021
ISSN: 0016-7061
1872-6259
Statement of
Responsibility: 
Lydia Pohl, Angelika Kölbl, Daniel Uteau, Stephan Peth, Werner Häusler, Luke Mosley, Petra Marschner, Rob Fitzpatrick, Ingrid Kogel-Knabner
Abstract: Acid sulfate soils contain hypersulfidic material, e.g. pyrite (FeS₂). Under oxidizing conditions, it transforms to sulfuric material (pH < 4), which is accompanied with the formation of jarosite [KFe₃(SO₄)₂(OH)₆] along root channels (designated as jarositic phyto tubules). The encapsulation of root residues with jarosite can lead to reduced spatial availability of organic carbon which is necessary as substrate for microbes. This can limit microbial activity which might be crucial for prospective remediation success. We investigated jarositic phyto tubules by combining X-ray computed microtomography (µCT) and nanoscale secondary ion mass spectrometry (NanoSIMS), to elucidate the porosity and organic matter distribution at the spatial scale most relevant for microbial processes. We demonstrated that the jarosite can be differentiated into zones with either high or low jarosite concentrations at distances of < 0.5 mm and 0.5–1.9 mm from the relict root channel, respectively. The results showed a closer association between jarosite and organic matter in the zone with high jarosite concentration. However, the pore space in immediate vicinity of the root is almost completely filled by jarosite and the organic matter is completely encapsulated. We conclude that the overall poor accessibility of organic matter will strongly retard remediation processes of sulfuric soils after re-submergence.
Keywords: Iron sulfate; jarosite; wetlands; pore size distribution; acid sulfate soil; mangrove roots
Rights: © 2021 Elsevier B.V. All rights reserved.
RMID: 1000040228
DOI: 10.1016/j.geoderma.2021.115124
Grant ID: http://purl.org/au-research/grants/arc/DP170104541
Appears in Collections:Agriculture, Food and Wine publications

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