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

Titelangaben

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

Abstract

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.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER140913
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: 11 Jan 2018 08:24
Letzte Änderung: 11 Jan 2018 08:24
URI: https://eref.uni-bayreuth.de/id/eprint/41270