Zur Kurzanzeige

Wet sieving versus dry crushing: Soil microaggregates reveal different physical structure, bacterial diversity and organic matter composition in a clay gradient

dc.date.accessioned2021-03-12T16:08:25Z
dc.date.available2021-03-12T16:08:25Z
dc.date.issued2020-06-18
dc.identifierdoi:10.17170/kobra-202103043417
dc.identifier.urihttp://hdl.handle.net/123456789/12634
dc.description.sponsorshipGefördert im Rahmen des Projekts DEALger
dc.language.isoengeng
dc.rightsNamensnennung 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectaggregate breakdown dynamicseng
dc.subjectaggregate carboneng
dc.subjectaggregate separationeng
dc.subjectaggregate stabilityeng
dc.subjectaggregationeng
dc.subjectmicroaggregateeng
dc.subjectmicrobial community structureeng
dc.subjectSOM distributioneng
dc.subject.ddc333
dc.subject.ddc570
dc.titleWet sieving versus dry crushing: Soil microaggregates reveal different physical structure, bacterial diversity and organic matter composition in a clay gradienteng
dc.typeAufsatz
dcterms.abstractSoil microaggregates contain particles of different sizes, which may affect their potential to store organic carbon (OC). A variety of methods can be used to isolate microaggregates from the larger soil structures, among which wet sieving approaches are widely employed. We developed a novel dry crushing method that isolates microaggregates along failure planes due to mechanical stresses rather than hydraulic pressures and compared the mechanical stability, OC contents and microbial community composition between dry‐crushed and wet‐sieved samples with contrasting clay contents. Dry‐crushed samples exhibited a higher stability and bacterial diversity compared to wet‐sieved samples. As a result, the dry‐crushed microaggregates had different size distributions when analysed dry and after wetting. In the dry state, dry‐crushed microaggregates were larger and contained more sand‐sized primary particles within the aggregate structures. The wetting of dry‐crushed aggregates caused a disintegration of larger microaggregates and sand‐sized primary particles into smaller microaggregates that contained finer particles. In the soils with lower clay contents, the diameter of dry‐crushed microaggregates was 40 μm larger due to more sand‐sized primary particles remaining within the aggregates. Depending on how much volume in microaggregates is occupied by large primary particles, the OC concentration increased in the soil with higher clay content. Wet‐sieved size fractions also showed a similar pattern of OC distribution, whereas more primary particles were observed outside of aggregates. Wet sieving approaches disperse the soil into OC‐rich aggregates and might be preferable if OC dynamics are investigated. Differences in bacterial community composition in dependence on clay content were more pronounced in dry‐crushed microaggregates. If intact aggregate architectures are of interest for the isolation of soil structural units, the presented dry crushing method might provide an advantageous alternative that also better preserves bacterial diversity.eng
dcterms.accessRightsopen access
dcterms.creatorFelde, Vincent John Martin Noah Linus
dcterms.creatorSchweizer, Steffen A.
dcterms.creatorBiesgen, Danh
dcterms.creatorUlbrich, Angela
dcterms.creatorUteau, Daniel
dcterms.creatorKnief, Claudia
dcterms.creatorGraf-Rosenfellner, Markus
dcterms.creatorKögel-Knabner, Ingrid
dcterms.creatorPeth, Stephan
dc.relation.doidoi:10.1111/ejss.13014
dc.relation.projectidGrant/Award Number: DFG RU 2179
dc.subject.swdBodenbestandteilger
dc.subject.swdBodenbakterienger
dc.subject.swdSieben <Verfahrenstechnik>ger
dc.subject.swdZerkleinernger
dc.subject.swdBodenmikroorganismusger
dc.type.versionpublishedVersion
dcterms.source.identifierEISSN 1365-2389
dcterms.source.issueIssue 2
dcterms.source.journalEuropean Journal of Soil Science (EJSS)eng
dcterms.source.pageinfo810-828
dcterms.source.volumeVolume 72
kup.iskupfalse


Dateien zu dieser Ressource

Thumbnail
Name:
license_rdf
Größe:
908Bytes
Format:
application/rdf+xml
Öffnen
Thumbnail
Name:
ejss_13014.pdf
Größe:
7.318Mb
Format:
PDF
Öffnen

Das Dokument erscheint in:

Zur Kurzanzeige

Namensnennung 4.0 International
Solange nicht anders angezeigt, wird die Lizenz wie folgt beschrieben: Namensnennung 4.0 International