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Statements

Subject Item
n2:RIV%2F60076658%3A12310%2F14%3A43887509%21RIV15-MSM-12310___
rdf:type
skos:Concept n16:Vysledek
rdfs:seeAlso
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0094076
dcterms:description
Enzyme-mediated decomposition of soil organic matter (SOM) is controlled, amongst other factors, by organic matter properties and by the microbial decomposer community present. Since microbial community composition and SOM properties are often interrelated and both change with soil depth, the drivers of enzymatic decomposition are hard to dissect. We investigated soils from three regions in the Siberian Arctic, where carbon rich topsoil material has been incorporated into the subsoil (cryoturbation). We took advantage of this subduction to test if SOM properties shape microbial community composition, and to identify controls of both on enzyme activities. We found that microbial community composition (estimated by phospholipid fatty acid analysis), was similar in cryoturbated material and in surrounding subsoil, although carbon and nitrogen contents were similar in cryoturbated material and topsoils. This suggests that the microbial community in cryoturbated material was not well adapted to SOM properties. We also measured three potential enzyme activities (cellobiohydrolase, leucine-amino-peptidase and phenoloxidase) and used structural equation models (SEMs) to identify direct and indirect drivers of the three enzyme activities. The models included microbial community composition, carbon and nitrogen contents, clay content, water content, and pH. Models for regular horizons, excluding cryoturbated material, showed that all enzyme activities were mainly controlled by carbon or nitrogen. Microbial community composition had no effect. In contrast, models for cryoturbated material showed that enzyme activities were also related to microbial community composition. The additional control of microbial community composition could have restrained enzyme activities and furthermore decomposition in general. Enzyme-mediated decomposition of soil organic matter (SOM) is controlled, amongst other factors, by organic matter properties and by the microbial decomposer community present. Since microbial community composition and SOM properties are often interrelated and both change with soil depth, the drivers of enzymatic decomposition are hard to dissect. We investigated soils from three regions in the Siberian Arctic, where carbon rich topsoil material has been incorporated into the subsoil (cryoturbation). We took advantage of this subduction to test if SOM properties shape microbial community composition, and to identify controls of both on enzyme activities. We found that microbial community composition (estimated by phospholipid fatty acid analysis), was similar in cryoturbated material and in surrounding subsoil, although carbon and nitrogen contents were similar in cryoturbated material and topsoils. This suggests that the microbial community in cryoturbated material was not well adapted to SOM properties. We also measured three potential enzyme activities (cellobiohydrolase, leucine-amino-peptidase and phenoloxidase) and used structural equation models (SEMs) to identify direct and indirect drivers of the three enzyme activities. The models included microbial community composition, carbon and nitrogen contents, clay content, water content, and pH. Models for regular horizons, excluding cryoturbated material, showed that all enzyme activities were mainly controlled by carbon or nitrogen. Microbial community composition had no effect. In contrast, models for cryoturbated material showed that enzyme activities were also related to microbial community composition. The additional control of microbial community composition could have restrained enzyme activities and furthermore decomposition in general.
dcterms:title
Effects of Soil Organic Matter Properties and Microbial Community Composition on Enzyme Activities in Cryoturbated Arctic Soils Effects of Soil Organic Matter Properties and Microbial Community Composition on Enzyme Activities in Cryoturbated Arctic Soils
skos:prefLabel
Effects of Soil Organic Matter Properties and Microbial Community Composition on Enzyme Activities in Cryoturbated Arctic Soils Effects of Soil Organic Matter Properties and Microbial Community Composition on Enzyme Activities in Cryoturbated Arctic Soils
skos:notation
RIV/60076658:12310/14:43887509!RIV15-MSM-12310___
n4:aktivita
n15:S
n4:aktivity
S
n4:cisloPeriodika
4
n4:dodaniDat
n18:2015
n4:domaciTvurceVysledku
n8:5851114 n8:9014632 n8:8110107
n4:druhVysledku
n13:J
n4:duvernostUdaju
n19:S
n4:entitaPredkladatele
n14:predkladatel
n4:idSjednocenehoVysledku
13772
n4:idVysledku
RIV/60076658:12310/14:43887509
n4:jazykVysledku
n10:eng
n4:klicovaSlova
archaeal; dynamics; horizons; ecosystem; bacterial; grassland; depth; decomposition; carbon pools; ecoenzymatic stoichiometry
n4:klicoveSlovo
n7:dynamics n7:carbon%20pools n7:bacterial n7:ecosystem n7:ecoenzymatic%20stoichiometry n7:archaeal n7:depth n7:grassland n7:decomposition n7:horizons
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[DB9E47C2B62F]
n4:nazevZdroje
PLoS One
n4:obor
n5:DF
n4:pocetDomacichTvurcuVysledku
3
n4:pocetTvurcuVysledku
21
n4:rokUplatneniVysledku
n18:2014
n4:svazekPeriodika
9
n4:tvurceVysledku
Čapek, Petr Guggenberger, Georg Gittel, Antje Takriti, Mounir Mikutta, Robert Hofhansl, Florian Knoltsch, Anna Shibistova, Olga Alves, Ricardo J. Eloy Richter, Andreas Schnecker, Joerg Wild, Birgit Lashchinskiy, Nikolay Hofer, Angelika Šantrůčková, Hana Weltin, Georg Gentsch, Norman Bárta, Jiří Kienzl, Sandra Fuchslueger, Lucia Urich, Tim
n4:wos
000334107500121
s:issn
1932-6203
s:numberOfPages
10
n9:doi
10.1371/journal.pone.0094076
n11:organizacniJednotka
12310