Biochar decreases methanogenic archaea abundance and methane emissions in a flooded paddy soil.

Autor: Qi L; College of Resources and Environment, Southwest University, Chongqing 400716, China; Department of Renewable Resources, University of Alberta, Edmonton T6G 2E3, Canada; College of Forestry, Beijing Forestry University, Beijing 100083, China., Ma Z; Department of Renewable Resources, University of Alberta, Edmonton T6G 2E3, Canada., Chang SX; Department of Renewable Resources, University of Alberta, Edmonton T6G 2E3, Canada; State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China., Zhou P; College of Resources and Environment, Southwest University, Chongqing 400716, China., Huang R; College of Resources and Environment, Southwest University, Chongqing 400716, China; College of Resource, Sichuan Agricultural University, Chengdu 611130, China., Wang Y; College of Resources and Environment, Southwest University, Chongqing 400716, China., Wang Z; College of Resources and Environment, Southwest University, Chongqing 400716, China., Gao M; College of Resources and Environment, Southwest University, Chongqing 400716, China. Electronic address: gaoming@swu.edu.cn.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2021 Jan 15; Vol. 752, pp. 141958. Date of Electronic Publication: 2020 Aug 25.
DOI: 10.1016/j.scitotenv.2020.141958
Abstrakt: Biochar addition can reduce methane (CH 4 ) emissions from paddy soils while the mechanisms involved are not entirely clear. Here, we studied the effect of biochar addition on CH 4 emissions, and the abundance and community composition of methanogens and methanotrophs over two rice cultivation seasons. The experiment had the following five treatments: control (CK), chemical fertilizer application only (BC0), and 0.5% (w/w) (BC1), 1% (BC2), and 2% of biochar applied with chemical fertilizers (BC3). The season-wide CH 4 emissions were decreased (P < 0.05) by 22.2-95.7% in biochar application compared with BC0 in the two rice seasons (2017 and 2018). In 2017, biochar application decreased methanogenic archaea (mcrA) but increased methanotrophic bacteria (pmoA) abundances, and decreased the ratio of mcrA/pmoA, as compared with BC0 (P < 0.05). In 2018, the abundance of mcrA was lower in BC2 and BC3 than in BC0 (P < 0.05) but was not different between BC0 and BC1, and the abundance of pmoA was lower in BC1, BC2 and BC3 than in BC0 (P < 0.05). The CH 4 emissions were positively related to abundances of the mcrA gene (P < 0.01) but not to that of the pmoA gene in two rice seasons. Rice grain yield was increased by 62.2-94.1% in biochar addition treatments compared with BC0 in the first year (P < 0.01) and by 29.9-37.6% in BC2 and BC3 compared with BC0 in the second year (P < 0.05). Biochar application decreased CH 4 emissions by reducing methanogenic archaea abundance in the studied flooded paddy soil.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: