Datum
2022-08-10Schlagwort
570 Biowissenschaften, Biologie BiomasseBodenchemieKohlenstoffMineralisationPartikulärer organischer StoffStreuMetadata
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Aufsatz![](/themes/Mirage2/images/Open_Access_logo_PLoS_transparent.svg)
Microbial carbon use efficiency of litter with distinct C/N ratios in soil at different temperatures, including microbial necromass as growth component
Zusammenfassung
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.
Zitierform
In: Biology and Fertility of Soils Volume 58 / Issue 7 (2022-08-10) , S. 761-770 ; eissn:1432-0789Förderhinweis
Gefördert im Rahmen des Projekts DEALZitieren
@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}
}
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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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