Effects of soil organic matter properties and microbial community composition on enzyme activities in cryoturbated arctic soils

Download statistics - Document (COUNTER):

Schnecker, J.; Wild, B.; Hofhansl, F.; Alves, R.J.E.; Bárta, J.; et al.: Effects of soil organic matter properties and microbial community composition on enzyme activities in cryoturbated arctic soils. In: PLoS ONE 9 (2014), Nr. 4, e94076. DOI: https://doi.org/10.1371/journal.pone.0094076

Repository version

To cite the version in the repository, please use this identifier: https://doi.org/10.15488/966

Selected time period:


Sum total of downloads: 317

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. The functional decoupling of SOM properties and microbial community composition might thus be one of the reasons for low decomposition rates and the persistence of 400 Gt carbon stored in cryoturbated material.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2014
Appears in Collections:Naturwissenschaftliche Fakultät

distribution of downloads over the selected time period:

downloads by country:

pos. country downloads
total perc.
1 image of flag of Germany Germany 245 77.29%
2 image of flag of United States United States 29 9.15%
3 image of flag of China China 11 3.47%
4 image of flag of Russian Federation Russian Federation 5 1.58%
5 image of flag of Indonesia Indonesia 5 1.58%
6 image of flag of Vietnam Vietnam 4 1.26%
7 image of flag of France France 3 0.95%
8 image of flag of No geo information available No geo information available 2 0.63%
9 image of flag of Saudi Arabia Saudi Arabia 2 0.63%
10 image of flag of Austria Austria 2 0.63%
    other countries 9 2.84%

Further download figures and rankings:


Zur Erhebung der Downloadstatistiken kommen entsprechend dem „COUNTER Code of Practice for e-Resources“ international anerkannte Regeln und Normen zur Anwendung. COUNTER ist eine internationale Non-Profit-Organisation, in der Bibliotheksverbände, Datenbankanbieter und Verlage gemeinsam an Standards zur Erhebung, Speicherung und Verarbeitung von Nutzungsdaten elektronischer Ressourcen arbeiten, welche so Objektivität und Vergleichbarkeit gewährleisten sollen. Es werden hierbei ausschließlich Zugriffe auf die entsprechenden Volltexte ausgewertet, keine Aufrufe der Website an sich.

Search the repository