Microbial driving mechanism of biochar and bean dregs on NH3 and N2O emissions during composting

Yajun Yang; Mukesh Kumar Awasthi; Lulu Wu; Ying Yan; Jialong Lv

doi:10.1016/j.biortech.2020.123829

Microbial driving mechanism of biochar and bean dregs on NH₃ and N₂O emissions during composting

Bioresour Technol. 2020 Nov:315:123829. doi: 10.1016/j.biortech.2020.123829. Epub 2020 Jul 13.

Authors

Yajun Yang¹, Mukesh Kumar Awasthi², Lulu Wu¹, Ying Yan¹, Jialong Lv³

Affiliations

¹ College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China.
² College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China.
³ College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China. Electronic address: ljlll@nwsuaf.edu.cn.

PMID: 32682258
DOI: 10.1016/j.biortech.2020.123829

Abstract

In this study, the effect of biochar (BC) and bean dregs (BD) on nitrifiers and denitrifiers as well as the contributions to the NH₃ and N₂O emissions were investigated. Compared with the BD treatment, the maximum value of NH₃ and N₂O emission was decreased by 32.92% and 46.61% in the BD + BC treatment, respectively. The production of NH₃ and N₂O was closely associated with the abundance and structure of nitrogen functional genes. BD + BC increased the abundance of AOB amoA gene to decrease the NH₃ emission. The abundance of nirS was more closely associated with N₂O. The abundance of nirS in the BD + BC was lowered by 18.93% compared with the BD treatment, thereby decreasing the N₂O emission after composting. Besides, the nosZ-type gene was the more functional denitrification bacterial communities to effect the N₂O emissions.

Keywords: Bean dregs; Biochar; Denitrifiers; Functional microbial community; Nitrifiers.

MeSH terms

Charcoal
Composting*
Denitrification
Nitrous Oxide / analysis
Soil
Soil Microbiology

Substances

Soil
biochar
Charcoal
Nitrous Oxide