[B-CG05] Methane in terrestrial and aquatic ecosystems: from microbes to the atmosphere

[BCG05-P03] Biochar amendment on soil properties and greenhouse gases emissions: An incubation study

Kai-Qing Zhuang¹, Yo-Jin Shiau², *Syu-Ruei Jhang¹ (1.Department of Safety,Health and Environmental Engineering, National United University, Miaoli 360301, Taiwan, 2.Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei 106, Taiwan)

Keywords:Biochar, Greenhouse gases, Incubation study

Biochar production as a soil amendment has been proposed as a strategy for mitigating climate change. This study aimed to investigate the hypothesis that biochar with different implementations can mitigate soil greenhouse gas emissions. In this study, a 30-day incubation was conducted using a commercial biochar made from rice straw residues. The biochar was applied under two soil moisture conditions, 25% and 75%, to represent dry and wet cultivation environments. This was done in controlled air temperatures of 37°C, using 1-liter jars. The fluxes revealed that, as the number of days increased, the soil environment tended toward complete anaerobic, which impeded the effective oxidation of methane to carbon dioxide. The findings indicate that biochar caused a slight increase in soil pH compared to the baseline measurements. The average carbon sequestration from 5% biochar were 1.6 and 1.4 g CO₂e kg^-1 under two soil moisture levels (25 and 75% WFPS), respectively. Further research is needed to investigate the impact of the characteristic and amount of biochar on soil characteristics and greenhouse gas emissions.