Decomposition of biogas residues in soil and their effects on microbial growth kinetics and enzyme activities
2012 | journal article. A publication with affiliation to the University of Göttingen.
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Decomposition of biogas residues in soil and their effects on microbial growth kinetics and enzyme activities
Chen, R.; Blagodatskaya, E.; Senbayram, M.; Blagodatsky, S. A.; Myachina, O.; Dittert, K. & Kuzyakov, Y. (2012)
Biomass and Bioenergy, 45 pp. 221-229. DOI: https://doi.org/10.1016/j.biombioe.2012.06.014
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- Authors
- Chen, Ruirui; Blagodatskaya, Evgenia; Senbayram, Mehmet; Blagodatsky, Sergey A.; Myachina, Olga; Dittert, Klaus; Kuzyakov, Yakov
- Abstract
- The rapid development of biogas production will result in increased use of biogas residues as organic fertilizers. However, control of microbial activity by organic fertilizers remains a challenge for modern land use, especially with respect to mitigating greenhouse effects and increasing C sequestration in soil. To address this issue, we compared CO2 emissions, microbial growth and extracellular enzyme activities in agricultural soil amended with biogas residues (BGR) versus maize straw (MST). Over a 21 day incubation period, 6.4% of organic C added was mineralised and evolved as CO2 with BGR and 30% with MST. As shown by the substrate-induced growth respiration approach, BGR and MST significantly decreased the specific microbial growth rate (mu) and increased the microbial biomass C in the soil, indicating a clear shift in the microbial community to slower-growing microorganisms. Because of the reduced availability of C associated with the less labile C and more lignin in biogas residues, observed mu values and microbial biomass C were lower after BGR application than after MST application. After 21 days incubation, BGR had no effect on the activity of three extracellular enzymes: beta-glucosidase and cellobiohydrolase, both of which are involved in cellulose decomposition; and xylanase, which is involved in hemicellulose decomposition. In contrast, MST significantly increased the activity of these three enzymes. The application of biogas residues in short-term experiment leads to a 34% increase in soil C content and slower C turnover as compared to common maize residues. (c) 2012 Elsevier Ltd. All rights reserved.
- Issue Date
- 2012
- Journal
- Biomass and Bioenergy
- Organization
- Fakultät für Agrarwissenschaften ; Department für Nutzpflanzenwissenschaften ; Abteilung Pflanzenernährung und Ertragsphysiologie
- Working Group
- Aufgabengebiet Agrikulturchemie
- ISSN
- 0961-9534