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Date
2022-08-10Subject
570 Life sciences; biology BiomasseBodenchemieKohlenstoffMineralisationPartikulärer organischer StoffStreuMetadata
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Aufsatz
Microbial carbon use efficiency of litter with distinct C/N ratios in soil at different temperatures, including microbial necromass as growth component
Abstract
An incubation study was carried out to investigate the effects of litter quality, i.e. ¹⁵ N-labelled maize (C/N of 25.5) and Rhodes grass (C/N of 57.8) leaf litter on microbial carbon use efficiency (CUE) and priming effects in a moderate alkaline soil at two different temperatures (15 and 25 °C). CUE values were calculated from the isotopic composition of the particulate organic matter (POM) recovered as an index for the amount of non-decomposed litter. This approach allows the inclusion of microbial necromass growth components in the calculation of CUE values. Additionally, the soil was incubated for 10, 20, and 30 days to determine the optimum incubation period. Soil microbial CUE values of maize and Rhodes grass leaf litter, including microbial necromass C in the calculation of CUE, varied around 0.61, regardless of litter type, temperature, and incubation period. However, the optimum incubation time is between 20 and 30 days, depending on temperature. The strong priming effect on autochthonous soil organic carbon (SOC) mineralization was apparently not caused by N mining, as it was similar for both litter qualities. It most likely resulted from SOC being used by microbial co-metabolism. The litter-induced true priming effect was accompanied by a significant increase in autochthonous POM. The current approach, including microbial necromass as growth component, has been shown to be a strong tool for investigating CUE values and priming effects after application of litter and harvest residues to soil, probably under all environmental conditions.
Citation
In: Biology and Fertility of Soils Volume 58 / Issue 7 (2022-08-10) , S. 761-770 ; eissn:1432-0789Sponsorship
Gefördert im Rahmen des Projekts DEALCitation
@article{doi:10.17170/kobra-202209226891,
author={Börger, Marie and Bublitz, Tabata and Dyckmans, Jens and Wachendorf, Christine and Jörgensen, Rainer Georg},
title={Microbial carbon use efficiency of litter with distinct C/N ratios in soil at different temperatures, including microbial necromass as growth component},
journal={Biology and Fertility of Soils},
year={2022}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 2022$n2022 1500 1/eng 2050 ##0##http://hdl.handle.net/123456789/14186 3000 Börger, Marie 3010 Bublitz, Tabata 3010 Dyckmans, Jens 3010 Wachendorf, Christine 3010 Jörgensen, Rainer Georg 4000 Microbial carbon use efficiency of litter with distinct C/N ratios in soil at different temperatures, including microbial necromass as growth component / Börger, Marie 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/http://hdl.handle.net/123456789/14186=x R 4204 \$dAufsatz 4170 5550 {{Biomasse}} 5550 {{Bodenchemie}} 5550 {{Kohlenstoff}} 5550 {{Mineralisation}} 5550 {{Partikulärer organischer Stoff}} 5550 {{Streu}} 7136 ##0##http://hdl.handle.net/123456789/14186
2022-10-12T12:50:19Z 2022-10-12T12:50:19Z 2022-08-10 doi:10.17170/kobra-202209226891 http://hdl.handle.net/123456789/14186 Gefördert im Rahmen des Projekts DEAL eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ microbial biomass ¹⁵ N/¹⁴ N ratio ¹³C/¹²C ratio CO₂ mineralization particulate organic matter microbial necromass 570 Microbial carbon use efficiency of litter with distinct C/N ratios in soil at different temperatures, including microbial necromass as growth component Aufsatz An incubation study was carried out to investigate the effects of litter quality, i.e. ¹⁵ N-labelled maize (C/N of 25.5) and Rhodes grass (C/N of 57.8) leaf litter on microbial carbon use efficiency (CUE) and priming effects in a moderate alkaline soil at two different temperatures (15 and 25 °C). CUE values were calculated from the isotopic composition of the particulate organic matter (POM) recovered as an index for the amount of non-decomposed litter. This approach allows the inclusion of microbial necromass growth components in the calculation of CUE values. Additionally, the soil was incubated for 10, 20, and 30 days to determine the optimum incubation period. Soil microbial CUE values of maize and Rhodes grass leaf litter, including microbial necromass C in the calculation of CUE, varied around 0.61, regardless of litter type, temperature, and incubation period. However, the optimum incubation time is between 20 and 30 days, depending on temperature. The strong priming effect on autochthonous soil organic carbon (SOC) mineralization was apparently not caused by N mining, as it was similar for both litter qualities. It most likely resulted from SOC being used by microbial co-metabolism. The litter-induced true priming effect was accompanied by a significant increase in autochthonous POM. The current approach, including microbial necromass as growth component, has been shown to be a strong tool for investigating CUE values and priming effects after application of litter and harvest residues to soil, probably under all environmental conditions. open access Börger, Marie Bublitz, Tabata Dyckmans, Jens Wachendorf, Christine Jörgensen, Rainer Georg doi:10.1007/s00374-022-01656-7 Biomasse Bodenchemie Kohlenstoff Mineralisation Partikulärer organischer Stoff Streu publishedVersion eissn:1432-0789 Issue 7 Biology and Fertility of Soils 761-770 Volume 58 false
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