Patterns of microbial processes shaped by parent material and soil depth in tropical rainforest soils
dc.contributor.author
Kidinda, Laurent
dc.contributor.author
Olagoke, Folasade K.
dc.contributor.author
Vogel, Cordula
dc.contributor.author
Kalbitz, Karsten
dc.contributor.author
Doetterl, Sebastian
dc.date.accessioned
2022-06-22T08:20:56Z
dc.date.available
2021-01-13T10:30:07Z
dc.date.available
2021-03-09T10:59:28Z
dc.date.available
2022-06-22T08:20:56Z
dc.date.issued
2020-12-01
dc.identifier.other
10.5194/soil-2020-80
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/462030
dc.identifier.doi
10.3929/ethz-b-000462030
dc.description.abstract
Microbial processes are one of the key factors driving carbon (C) and nutrient cycling in terrestrial ecosystems, and are strongly driven by the equilibrium between resource availability and demand. In deeply weathered tropical rainforest soils of Africa, it remains unclear whether patterns of microbial processes differ between soils developed from geochemically contrasting parent materials. Here we show that resource availability across soil depths and regions from mafic to felsic geochemistry shape patterns of soil microbial processes. During a 120-day incubation experiment, we found that microbial biomass C and extracellular enzyme activity were highest in the mafic region. Microbial C limitation was highest in the mixed sedimentary region and lowest in the felsic region, which we propose is related to the strength of contrasting C stabilization mechanisms and varying C quality. None of the investigated regions and soil depths showed signs of nitrogen (N) limitation for microbial processes. Microbial phosphorus (P) limitation increased with soil depth but was similar across geochemical regions, indicating that subsoils in the investigated soils were depleted in rock-derived nutrients and are therefore dependent on efficient biological recycling of nutrients. Microbial C limitation was lowest in subsoils, indicating that subsoil microbes can significantly participate in C cycling and limit C storage if increased oxygen availability is prevalent. Using multivariable regressions, we demonstrate that microbial biomass C normalized to soil organic C content (MBCSOC) is controlled by soil geochemistry and substrate quality, while microbial biomass C normalized to soil weight (MBCSoil) is predominantly driven by resource distribution. We conclude that due to differences in resource availability, microbial processes in deeply weathered tropical rainforest soils greatly vary across geochemical regions which must be considered when assessing soil microbial processes in organic matter turnover models.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Extracellular enzymes
en_US
dc.subject
Microbial biomass
en_US
dc.subject
Carbon limitation
en_US
dc.subject
Nutrient limitation
en_US
dc.title
Patterns of microbial processes shaped by parent material and soil depth in tropical rainforest soils
en_US
dc.type
Working Paper
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Soil Discussions
ethz.size
25 p.
en_US
ethz.notes
This preprint has been withdrawn by the authors.
en_US
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02722 - Institut für Terrestrische Oekosysteme / Institute of Terrestrial Ecosystems::09646 - Dötterl, Sebastian / Dötterl, Sebastian
en_US
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02722 - Institut für Terrestrische Oekosysteme / Institute of Terrestrial Ecosystems::09646 - Dötterl, Sebastian / Dötterl, Sebastian
en_US
ethz.date.deposited
2021-01-13T10:30:14Z
ethz.source
FORM
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2021-03-09T10:59:41Z
ethz.rosetta.lastUpdated
2024-02-02T17:28:50Z
ethz.rosetta.versionExported
true
ethz.COinS
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