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Microbial respiration per unit microbial biomass depends on soil litter carbon-to-nitrogen ratio

Title data

Spohn, Marie:
Microbial respiration per unit microbial biomass depends on soil litter carbon-to-nitrogen ratio.
In: Biogeosciences. Vol. 12 (2015) . - pp. 817-823.
ISSN 1726-4189
DOI: https://doi.org/10.5194/bg-12-817-2015

Abstract in another language

Soil microbial respiration is a central process in the terrestrial carbon (C) cycle. In this study I tested the effect of the carbon-to-nitrogen (C:N) ratio of soil litter layers on microbial respiration in absolute terms and per unit microbial biomass C. For this purpose, a global dataset on microbial respiration per unit microbial biomass C–termed the metabolic quotient (qCO2) – was compiled form literature data. It was found that the qCO2 in the soil litter layers was positively correlated with the litter C:N ratio and negatively related with the litter nitrogen (N) concentration. The positive relation between qCO2 and litter C:N ratio resulted from an increase in respiration with the C:N ratio in combination with no significant effect of the litter C:N ratio on the soil microbialbiomass C concentration. The results suggest that soil microorganisms respire more C both in absolute terms and per unit microbial biomass C when decomposing N-poor substrate. Thus, the findings indicate that atmospheric N deposition, leading to decreased litter C:N ratios, might decrease microbial respiration in soils.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER126122
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 29 Jul 2015 05:52
Last Modified: 29 Jul 2015 05:52
URI: https://eref.uni-bayreuth.de/id/eprint/17270