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dc.contributor.authorMikutta, R.en
dc.contributor.authorTurner, S.en
dc.contributor.authorSchippers, A.en
dc.contributor.authorGentsch, N.en
dc.contributor.authorMeyer-Stüve, S.en
dc.contributor.authorCondron, Leo M.en
dc.contributor.authorPeltzer, D. A.en
dc.contributor.authorRichardson, S. J.en
dc.contributor.authorEger, Andreen
dc.contributor.authorHempel, G.en
dc.contributor.authorKaiser, K.en
dc.contributor.authorKlotzbücher, T.en
dc.contributor.authorGuggenberger, G.en
dc.identifier.citationMikutta et al. (2019). Microbial and abiotic controls on mineral-associated organic matter in soil profiles along an ecosystem gradient. Scientific Reports, 9, 10294. doi:10.1038/s41598-019-46501-4en
dc.description.abstractFormation of mineral-organic associations is a key process in the global carbon cycle. Recent concepts propose litter quality-controlled microbial assimilation and direct sorption processes as main factors in transferring carbon from plant litter into mineral-organic associations. We explored the pathways of the formation of mineral-associated organic matter (MOM) in soil profiles along a 120-ky ecosystem gradient that developed under humid climate from the retreating Franz Josef Glacier in New Zealand. We determined the stocks of particulate and mineral-associated carbon, the isotope signature and microbial decomposability of organic matter, and plant and microbial biomarkers (lignin phenols, amino sugars and acids) in MOM. Results revealed that litter quality had little effect on the accumulation of mineral-associated carbon and that plant-derived carbon bypassed microbial assimilation at all soil depths. Seemingly, MOM forms by sorption of microbial as well as plant-derived compounds to minerals. The MOM in carbon-saturated topsoil was characterized by the steady exchange of older for recent carbon, while subsoil MOM arises from retention of organic matter transported with percolating water. Overall, MOM formation is not monocausal but involves various mechanisms and processes, with reactive minerals being effective filters capable of erasing chemical differences in organic matter inputs.en
dc.publisherNature Researchen
dc.relationThe original publication is available from - Nature Research -
dc.rights© The Author(s) 2019en
dc.rightsAttribution 4.0 International*
dc.subjectplant litteren
dc.subjectmineral organic associationsen
dc.subjectmineral-associated organic matter (MOM)en
dc.titleMicrobial and abiotic controls on mineral-associated organic matter in soil profiles along an ecosystem gradienten
dc.typeJournal Article
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Soil and Physical Sciencesen
dc.subject.anzsrc0503 Soil Sciencesen
dc.subject.anzsrc050301 Carbon Sequestration Scienceen
dc.subject.anzsrc05 Environmental Sciencesen
dc.relation.isPartOfScientific Reportsen
pubs.notesArticle number: 10294en
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/SOILS
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/2018 PBRF Staff group
pubs.publication-statusPublished onlineen

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