Datum
2020-11-02Schlagwort
570 Biowissenschaften, Biologie BiogasGülleGärungDüngemittelKompostSequestrierungMikroorganismusBodenMetadata
Zur Langanzeige
Aufsatz
Mineralisation of distinct biogas digestate qualities directly after application to soil
Zusammenfassung
Biogas is an important energy source produced by the anaerobic fermentation of raw faecal slurries and plant residues. Separation of the total digestate increases the fertilizer quality of the liquid fraction and the carbon sequestration potential of the solid fraction. A 12-day incubation study was carried out to investigate the relationships between the chemical composition of different digestate qualities and the immediate response of soil microbial activity and biomass indices. The highest cumulative (Σ) CO2-C efflux was observed after adding the solid fraction and lowest after adding the liquid fraction to soil, which was even lower than that of the control. The ΣCO2-C efflux showed the strongest negative correlation with the raw ash and strong positive correlations with the raw fibre concentration and the C/N ratio of the different digestate qualities. The highest and similar ΣN2O-N efflux was observed after adding the total digestate or the liquid fraction, which were equivalent to approximately 1% of added N. This relatively low percentage indicates a possible origin from nitrifier denitrification. Total digestate and its liquid fraction exhibited considerable net-N mineralisation rates, which could mainly be predicted by the C/N ratios of the different digestate qualities. Microbial biomass C did not respond to the application of any digestate quality, whereas the fungal ergosterol content increased after applying the solid and the composted solid fractions. This raw fibre–induced fungal growth led to strong net-N immobilisation in soil after applying these two digestate qualities.
Zitierform
In: Biology and Fertility of Soils Volume 57 / Issue 2 (2020-11-02) , S. 235-243 ; EISSN 1432-0789Förderhinweis
Gefördert im Rahmen des Projekts DEALZitieren
@article{doi:10.17170/kobra-202101203007,
author={Barduca, Laura and Wentzel, Stefanie and Schmidt, Reiner and Malagoli, Mario and Jörgensen, Rainer Georg},
title={Mineralisation of distinct biogas digestate qualities directly after application to soil},
journal={Biology and Fertility of Soils},
year={2020}
}
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2021-01-22T09:04:42Z 2021-01-22T09:04:42Z 2020-11-02 doi:10.17170/kobra-202101203007 http://hdl.handle.net/123456789/12430 Gefördert im Rahmen des Projekts DEAL eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ raw slurry fermented slurry fertilizer compost C sequestration soil microorganisms 570 Mineralisation of distinct biogas digestate qualities directly after application to soil Aufsatz Biogas is an important energy source produced by the anaerobic fermentation of raw faecal slurries and plant residues. Separation of the total digestate increases the fertilizer quality of the liquid fraction and the carbon sequestration potential of the solid fraction. A 12-day incubation study was carried out to investigate the relationships between the chemical composition of different digestate qualities and the immediate response of soil microbial activity and biomass indices. The highest cumulative (Σ) CO2-C efflux was observed after adding the solid fraction and lowest after adding the liquid fraction to soil, which was even lower than that of the control. The ΣCO2-C efflux showed the strongest negative correlation with the raw ash and strong positive correlations with the raw fibre concentration and the C/N ratio of the different digestate qualities. The highest and similar ΣN2O-N efflux was observed after adding the total digestate or the liquid fraction, which were equivalent to approximately 1% of added N. This relatively low percentage indicates a possible origin from nitrifier denitrification. Total digestate and its liquid fraction exhibited considerable net-N mineralisation rates, which could mainly be predicted by the C/N ratios of the different digestate qualities. Microbial biomass C did not respond to the application of any digestate quality, whereas the fungal ergosterol content increased after applying the solid and the composted solid fractions. This raw fibre–induced fungal growth led to strong net-N immobilisation in soil after applying these two digestate qualities. open access Barduca, Laura Wentzel, Stefanie Schmidt, Reiner Malagoli, Mario Jörgensen, Rainer Georg doi:10.1007/s00374-020-01521-5 Biogas Gülle Gärung Düngemittel Kompost Sequestrierung Mikroorganismus Boden publishedVersion EISSN 1432-0789 Issue 2 Biology and Fertility of Soils 235-243 Volume 57 false
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