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dc.contributor.authorWilson, Clare-
dc.contributor.authorCloy, Joanna M-
dc.contributor.authorGraham, Margaret C-
dc.contributor.authorHamlet, Laura-
dc.description.abstractIt is recognised that interactions between mineral oxides and soil organic matter (SOM) are an important factor in the stabilisation of soil organic carbon (SOC). The nature of these interactions is particularly complex in gleyed soils that experience periodic waterlogging and changeable redox conditions. This study explores the complex patterns of iron (Fe) (hydr)oxides and SOM in three soils with contrasting hydrological regimes (Gleysol, Stagnosol and Cambisol). Micromorphological examination of undisturbed soil thin sections was teamed with SEM-EDS analysis and sequential dissolution of Fe pedofeatures to gain a better understanding of the mechanisms involved in SOM stabilisation by mineral oxides. All soils contained a diverse range of particulate SOM forms and Fe pedofeatures; the degree of impregnation of the Fe pedofeatures was found to increase with depth and a strong correlation between the presence of SOM and Fe pedofeatures was found to exist through all soils. Weakly crystalline Fe (hydr)oxides were found in association with partially degraded tissue residues and amorphous fine organic matter (OM). Strongly crystalline Fe (hydr)oxides were found in all impregnative Fe pedofeatures and high Fe/C ratios suggested precipitative processes rather than sorption dominate SOC sequestration in these features. In addition, at the core of some strongly impregnated Fe nodules, occluded well preserved organic tissues were identified. The study highlights the range of processes and complexity involved in SOC sequestration over mm to cm scales and untangling this complexity is vital to understanding and modelling terrestrial C fluxes. Whilst the methods used here are not without their complications, the value of micro-scale studies of undisturbed soil thin sections is clearly demonstrated.en_UK
dc.relationWilson C, Cloy JM, Graham MC & Hamlet L (2013) A microanalytical study of iron, aluminium and organic matter relationships in soils with contrasting hydrological regimes, Geoderma, 202-203, pp. 71-81.-
dc.rightsPublished in Geoderma by Elsevier; Elsevier believes that individual authors should be able to distribute their accepted author manuscripts for their personal voluntary needs and interests, e.g. posting to their websites or their institution’s repository, e-mailing to colleagues. The Elsevier Policy is as follows: Authors retain the right to use the accepted author manuscript for personal use, internal institutional use and for permitted scholarly posting provided that these are not for purposes of commercial use or systematic distribution. An "accepted author manuscript" is the author’s version of the manuscript of an article that has been accepted for publication and which may include any author-incorporated changes suggested through the processes of submission processing, peer review, and editor-author communications.-
dc.subjectIron (hydr)oxidesen_UK
dc.subjectSoil organic matteren_UK
dc.subjectGley soilen_UK
dc.subjectSequential dissolutionen_UK
dc.titleA microanalytical study of iron, aluminium and organic matter relationships in soils with contrasting hydrological regimesen_UK
dc.typeJournal Articleen_UK
dc.type.statusPost-print (author final draft post-refereeing)-
dc.contributor.affiliationBiological and Environmental Sciences-
dc.contributor.affiliationUniversity of Edinburgh-
dc.contributor.affiliationUniversity of Edinburgh-
dc.contributor.affiliationBiological and Environmental Sciences-
Appears in Collections:Biological and Environmental Sciences Journal Articles

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