Microbial and abiotic controls on mineral-associated organic matter in soil profiles along an ecosystem gradient

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dc.identifier.uri http://dx.doi.org/10.15488/8622
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/8675
dc.contributor.author Mikutta, Robert
dc.contributor.author Turner, Stephanie
dc.contributor.author Schippers, Axel
dc.contributor.author Gentsch, Norman
dc.contributor.author Meyer-Stüve, Sandra
dc.contributor.author Condron, Leo M.
dc.contributor.author Peltzer, Duane A.
dc.contributor.author Richardson, Sarah J.
dc.contributor.author Eger, Andre
dc.contributor.author Hempel, Günter
dc.contributor.author Kaiser, Klaus
dc.contributor.author Klotzbücher, Thimo
dc.contributor.author Guggenberger, Georg
dc.date.accessioned 2019-12-09T12:32:26Z
dc.date.available 2019-12-09T12:32:26Z
dc.date.issued 2019
dc.identifier.citation Mikutta, R. et al.: Microbial and abiotic controls on mineral-associated organic matter in soil profiles along an ecosystem gradient. In: Scientific Reports 9 (2019), 10294. DOI: https://doi.org/10.1038/s41598-019-46501-4
dc.description.abstract Formation 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. eng
dc.language.iso eng
dc.publisher Berlin : Springer
dc.relation.ispartofseries Scientific Reports 9 (2019)
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject carbon cycle eng
dc.subject ecosystem eng
dc.subject mineral-associated organic matter eng
dc.subject.ddc 551 | Geologie, Hydrologie, Meteorologie ger
dc.title Microbial and abiotic controls on mineral-associated organic matter in soil profiles along an ecosystem gradient
dc.type article
dc.type Text
dc.relation.essn 2045-2322
dc.relation.doi https://doi.org/10.1038/s41598-019-46501-4
dc.bibliographicCitation.volume 9
dc.bibliographicCitation.firstPage 10294
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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