Global patterns and controls of soil greenhouse gas fluxes and crop yield under biochar application

• DOI: 10.1002/ldr.4868
• Publication Date: 2023-08-30T07:39:37Z
• Authors: Xiaoyu Jia; Weiming Yan; Jingyi Yang; Weiguang Chen; Hongze Ma; Xi Chen; Jin Liu; Yangquanwei Zhong; Zhouping Shangguan
• Keywords: Soil carbon; Nitrous oxide

Abstract Biochar application has been proven to be a viable technique in mitigating soil greenhouse gas (GHG) emissions and improving crop yield; however, the global patterns responses of GHG fluxes, warming potential (GWP), yield, intensity (GHGI) biochar application, as well key drivers biochar‐induced changes, are not fully synthesized. Hence, we conducted meta‐analysis 3883 paired observations from 220 studies. Overall, significantly increased carbon dioxide (CO 2 ) (7.4%) yield (9.4%) decreased methane (CH 4 , −13.0%) nitrous oxide (N O, −26.8%) emissions, GWP (−7.7%) GHGI (−14.3%). CH uptake was, observed change. The fluxes were more sensitive incubation pot experiments compared field In addition, CO mainly derived experiments, whereas did change climate, soil, experimental conditions also affected pH was most essential factor associated with variations fluxes. Globally, boosted (C) pool (38.1% upland 33.4% paddy) (−18.7% −14.5% paddy). Our study highlights role reduced N O mitigation while exploring relative importance influencing factors providing crucial insights for development individualized management measures.