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Biochar affects community composition of nitrous oxide reducers in a field experiment

Krause, Hans-Martin; Hüppi, Roman; Leifeld, Jens; El-Hadidi, Mohamed; Harter, Johannes; Kappler, Andreas; Hartmann, Martin; Behrens, Sebastian; Mäder, Paul and Gattinger, Andreas (2018) Biochar affects community composition of nitrous oxide reducers in a field experiment. Soil Biology and Biochemistry, 119, pp. 143-151.

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Online at: https://doi.org/10.1016/j.soilbio.2018.01.018

Summary

N2O is a major greenhouse gas and the majority of anthropogenic N2O emissions originate from agriculturally managed soils. Therefore, developing N2O mitigation strategies is a key challenge for the agricultural sector and biochar soil treatment is one reported option. Biochar's capacity to increase soil pH and to foster activity of specialized N2O reducers has been proposed as possible mechanisms for N2O mitigation. An experiment was undertaken to investigate whether changes in the community composition of N2O reducers was observed under field conditions after biochar application. The study objective was to assess the abundance and taxonomic composition of the functional marker genes nosZ and nosZ –II across a vegetation period of Zea mays L. after biochar or lime addition compared to an untreated control. After fertilization, biochar amendment resulted in a significant increase of nosZ gene copy numbers compared to the control and the lime treatment. Simultaneously a shift in community composition of nosZ-II bearing bacteria was observed in the biochar treatment that went beyond the sole liming effect. This study broadens our understanding of the functional impact of biochar on N2O emissions and emphasizes the possibility to shape the functioning of the N2O reducing microbial community through the addition of biochar at a field scale.


EPrint Type:Journal paper
Keywords:Biochar, nosZ, Functional diversity, N2O reduction, Field trial, Community composition, Department of Soil Sciences, Long-term Experiments, Climate Impact of Organic Agriculture
Subjects: Soil > Soil quality
Crop husbandry
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil Sciences
Egypt
USA > Other organizations
Switzerland > Other organizations
Germany > Other organizations
ISSN:0038-0717
Deposited By: Mäder, Paul
ID Code:32767
Deposited On:07 Mar 2018 12:01
Last Modified:07 Mar 2018 12:01
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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