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Soil biochar amendment shapes the composition of N2O-reducing microbial communities
Johannes Harter1, Pascal Weigold1, Mohamed El-Hadidi2
1Geomicrobiology & Microbial Ecology, Center for Applied Geosciences, University of Tuebingen, Sigwartstr. 10, 72076 Tuebingen, Germany.
The Science of the Total Environment
|April 22, 2016
Summary
Soil biochar amendment alters microbial communities, impacting nitrous oxide (N2O) reduction. This study reveals biochar
Area of Science:
- Soil science
- Microbiology
- Environmental science
Background:
- Soil biochar amendment is recognized for enhancing soil quality, carbon sequestration, and mitigating nitrous oxide (N2O) emissions.
- N2O, a potent greenhouse gas, originates from microbial nitrogen transformations in soil.
- Limited research exists on biochar's impact on the taxonomic composition of N2O-reducing microbial communities, specifically those carrying the nosZ gene.
Purpose of the Study:
- To investigate the effects of soil biochar amendment on the taxonomic composition of the soil microbial community.
- To analyze shifts in bacterial diversity and the abundance of N2O-reducing microorganisms (nosZ gene-harboring) in response to biochar.
Main Methods:
- Utilized 454 pyrosequencing to analyze microbial diversity in biochar-amended and control soil microcosms.
- Sequenced bacterial 16S rRNA gene amplicons to assess overall community structure.
- Sequenced typical and atypical nosZ gene fragments to identify N2O-reducing microbial populations.
Main Results:
- Biochar amendment significantly altered the 16S rRNA gene-based bacterial community composition and structure.
- Distinct functional traits for N2O reduction, associated with typical and atypical nosZ genes (e.g., Pseudomonas stutzeri, Pedobacter saltans), developed in biochar-amended soils.
- Biochar influenced the relative abundance and taxonomic makeup of soil microbes involved in N2O reduction.
Conclusions:
- Soil biochar amendment impacts both general bacterial diversity and the specific taxonomic composition of N2O-reducing microbial communities.
- Biochar application can modulate the functional traits of soil microbes responsible for nitrogen cycling and greenhouse gas mitigation.
- Findings enhance understanding of biochar's role in soil microbial ecology and its potential for managing nitrogen cycling and N2O emissions.
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