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dc.contributor.authorCloy, Joanna Men_UK
dc.contributor.authorWilson, Clareen_UK
dc.contributor.authorGraham, Margaret Cen_UK
dc.description.abstractThe importance of soil organic carbon (SOC) stabilization via chemical interactions with Fe and Al oxide minerals within gley soils remains unclear. Changes in the proportions of Fe/Al oxides and SOC and N contents associated with Fe/Al oxides within the profiles of gley soils under contrasting hydrological regimes and freely draining control soils from Harwood Forest (northeast England) were investigated. Sequential selective dissolution techniques were used to measure Fe/Al oxide crystallinity and explore whether crystallinity differed between gleyed and freely draining soils. Extracts were analyzed using Fourier transform infrared spectroscopy to investigate the chemical characteristics of organic matter (OM) associated with Fe/Al oxides. Strongly crystalline Fe oxides were the dominant (∼50%–80% of total Fe oxides present) mineral phase in gley mineral soils. Contrasting gley soil hydrological regimes influenced total subsoil Fe and total and weakly crystalline Al oxide concentrations. Also, within-profile changes in strongly crystalline Fe oxide concentrations were linked to differences in hydrological and redox conditions. A large proportion of SOC (generally 70%–90% of total) seemed to be associated with Fe/Al oxides. Correlation plots, however, indicated that SOC contents were not linearly related to amounts of total Fe and Al oxides, weakly crystalline Fe and Al oxides, or strongly crystalline Fe oxides. The lack of linear correlations observed for these acidic soils may be caused by contributions from other extractable soil components and factors such as high organic loadings and insufficient amounts of Fe/Al oxides for interaction with SOC in topsoils and variable surface loadings of different organic inputs at different soil depths. Subsoil C/N ratios (∼18–21) were higher than those in extracted subsoil residues (∼9–17), suggesting that minerals other than Fe/Al oxides preferentially adsorbed N-rich microbially processed compounds. The OM associated with weakly and strongly crystalline Fe/Al oxides was chemically different, the latter generally having greater hydroxyl, aliphatic, carboxylate, and /or phenolic character and less carbohydrate character than the former. This research shows that interactions between Fe/Al oxides and SOM in redox-dynamic gley soils under different hydrological regimes are complex, and further investigations of SOC stabilization in these systems using selective dissolution and other complementary techniques are required.en_UK
dc.publisherLippincott, Williams and Wilkinsen_UK
dc.relationCloy JM, Wilson C & Graham MC (2014) Stabilization of Organic Carbon via Chemical Interactions with Fe and Al Oxides in Gley Soils. Soil Science, 179 (12), pp. 547-560.
dc.rightsThe publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.en_UK
dc.subjectGley soilsen_UK
dc.subjectsoil organic carbonen_UK
dc.subjectiron oxidesen_UK
dc.subjectorgano-mineral interactionsen_UK
dc.titleStabilization of Organic Carbon via Chemical Interactions with Fe and Al Oxides in Gley Soilsen_UK
dc.typeJournal Articleen_UK
dc.rights.embargoreason[Cloy et al 2014 Soil Sci.pdf] The publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work.en_UK
dc.citation.jtitleSoil Scienceen_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.funderNatural Environment Research Councilen_UK
dc.contributor.affiliationUniversity of Edinburghen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationUniversity of Edinburghen_UK
dc.relation.funderprojectIntegrating physical and chemical techniques to characterise soil micro-sitesen_UK
rioxxterms.apcnot requireden_UK
rioxxterms.typeJournal Article/Reviewen_UK
local.rioxx.authorCloy, Joanna M|en_UK
local.rioxx.authorWilson, Clare|0000-0002-0287-8576en_UK
local.rioxx.authorGraham, Margaret C|en_UK
local.rioxx.projectNE/HO1263X/1|Natural Environment Research Council|
local.rioxx.filenameCloy et al 2014 Soil Sci.pdfen_UK
Appears in Collections:Biological and Environmental Sciences Journal Articles

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