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Microbial physiology and soil CO2 efflux after 9 years of soil warming in a temperate forest : no indications for thermal adaptions

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Schindlbacher, Andreas ; Schnecker, Jörg ; Takriti, Mounir ; Borken, Werner ; Wanek, Wolfgang:
Microbial physiology and soil CO2 efflux after 9 years of soil warming in a temperate forest : no indications for thermal adaptions.
In: Global Change Biology. Bd. 21 (2015) Heft 11 . - S. 4265-4277.
ISSN 1365-2486
DOI: https://doi.org/10.1111/gcb.12996

Abstract

Thermal adaptations of soil microorganisms could mitigate or facilitate global warming effects on soil organic matter (SOM) decomposition and soil CO2 efflux. We incubated soil from warmed and control subplots of a forest soil warming experiment to assess if 9 years of soil warming affected the rates and the temperature sensitivity of the soil CO2 efflux, extracellular enzyme activities, microbial efficiency and gross N mineralization. Mineral soil (0-10 cm depth) was incubated at temperatures ranging from 3 - 23 °C. No adaptations to long-term warming were observed regarding the heterotrophic soil CO2 efflux (R10 warmed: 2.31 ± 0.15 μmol m−2 s−1, control: 2.34 ± 0.29 μmol m−2 s−1; Q10 warmed: 2.45 ± 0.06, control: 2.45 ± 0.04). Potential enzyme activities increased with incubation temperature but the temperature sensitivity of the enzymes did not differ between the warmed and the control soil. The ratio of C:N acquiring enzyme activities was significantly higher in the warmed soil. Microbial biomass specific respiration rates increased with incubation temperature, but the rates and the temperature sensitivity (Q10 warmed: 2.54 ± 0.23, control 2.75 ±0.17) did not differ between warmed and control soil. Microbial substrate use efficiency (SUE) declined with increasing incubation temperature in both, warmed and control soil. SUE and its temperature sensitivity (Q10 warmed: 0.84 ± 0.03, control: 0.88 ± 0.01) did not differ between warmed and control soil either. Gross N mineralization was invariant to incubation temperature and was not affected by long-term soil warming. Our results indicate that thermal adaptations of the microbial decomposer community are unlikely to occur in C-rich calcareous temperate forest soils.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER129031
Institutionen der Universität: Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 03 Aug 2016 10:23
Letzte Änderung: 03 Aug 2016 10:23
URI: https://eref.uni-bayreuth.de/id/eprint/33805