Exploring long-term effects of biochar on mitigating methane emissions from paddy soil: a review

• Published in: Biochar (Online) Vol. 3; no. 2; pp. 125 - 134
• Main Authors: Nan, Qiong, Xin, Liqing, Qin, Yong, Waqas, Muhammad, Wu, Weixiang
• Format: Journal Article
• Language: English
• Published: Singapore Springer Singapore 01.06.2021
• Subjects: Agriculture; Ceramics; Composites; Earth and Environmental Science; Environment; Environmental Engineering/Biotechnology; Fossil Fuels (incl. Carbon Capture); Glass; Natural Materials; Renewable and Green Energy; Review; Soil Science & Conservation; Methane mitigation; Biochar; Methanotrophs; Methanogens
• ISSN: 2524-7972; 2524-7867
• DOI: 10.1007/s42773-021-00096-0

Biochar has been reported to mitigate short-term methane (CH 4 ) emissions from paddy soil. Currently, CH 4 mitigation by biochar has primarily focused on the abundance and variations of methanogens and methanotrophs, and changes in their activities during methane production and consumption. However, long-term effects of biochar on methane mitigation from paddy soil remain controversial. This review overviewed the existing mechanisms for CH 4 mitigation as a result of biochar application. In addition, the two existing opinions on the long-term CH 4 mitigation effect upon biochar application were highlighted. Combining the already explored mechanisms of fresh biochar on CH 4 mitigation from paddy soil and a novel discovery, the potential mechanisms of biochar on long-term methane emission response were proposed. This review also revealed the uncertain responses of biochar on long-term CH 4 mitigation. Therefore, to achieve carbon neutral goal, it is important to further explore the mechanisms of long-term CH 4 mitigation under biochar application.