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Turnover of carbon and phosphorus in the microbial biomass depending on phosphorus availability

Title data

Spohn, Marie ; Widdig, Meike:
Turnover of carbon and phosphorus in the microbial biomass depending on phosphorus availability.
In: Soil Biology & Biochemistry. Vol. 113 (October 2017) . - pp. 53-59.
ISSN 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2017.05.017

Abstract in another language

Adjustment of the mean residence time (MRT) of elements in the soil microbial biomass (SMB) might bean important process by which microbial communities adapt to nutrient-poor environments andmaintain their element biomass ratio. Yet, little is known about the turnover of elements such as carbon (C) and phosphorus (P) in the SMB, which is partly due to methodological challenges. This is the first study to determine the MRT of C and P in SMB based on labeling of microbial DNA with 14C and 33P. We studied the MRT of C and P in the SMB of topsoil from a temperate, mesic grassland fertilized with five different amounts of P. For this purpose, soil was labeled with 14C-glucose and 33P-phosphate and incubated for 24 h, and then, 14C and 33P in the soil microbial DNA were determined. The MRT of C and P was calculated based on the C and P content of DNA, and the observation that soil microbial biomass C and microbial DNA are linearly correlated. The SMB-C and the MRT of C in the SMB were not affected by P vailability, whereas the microbial community significantly increased the MRT of P in its biomass from18.1 to 39.0 days with decreasing P availability. Our results indicate that the adjustment of the MRT ofindividual elements in the SMB is an important process by which microbes adapt to nutrient poor environments and are able to maintain their biomass element ratio when decomposing substrate with a very high C-to-nutrient ratio.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER140913
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Soil Ecology
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 11 Jan 2018 08:24
Last Modified: 11 Jan 2018 08:24
URI: https://eref.uni-bayreuth.de/id/eprint/41270