Impact of Biochar Application on Soil Carbon Sink and Greenhouse Gas Emissions of Farmlands in China:a Meta-Analysis
Biochar,as a soil amendment,has significant effects on soil carbon sequestration and greenhouse gas emissions,making it has great application prospects in agriculture and ecological restoration.To systematically evaluate the impact of biochar on soil carbon sequestration and greenhouse effects,this study conducted a Meta-analysis by integrating 204 articles(with a total of 1,079 experimental groups)from the China National Knowl-edge Infrastructure(CNKI)database concerning changes in soil organic carbon(SOC)and related greenhouse gas emission indicators after biochar application.The results indicated that the addition of biochar significantly en-hanced soil carbon sequestration,with a significant increase observed in SOC and its carbon components.The in-crease in SOC was approximately 47.97%,while soluble organic carbon and microbial carbon increased by 17.99%and 27.45%,respectively.The organic carbon content in different particle-size aggregates increased by 13.63%to 62.41%,with the highest increase observed in aggregates<0.053 mm.Moreover,biochar application in farmland resulted in significant emissions reduction,with emissions of nitrous oxide and methane decreasing by 23.7%and 21.27%,respectively.Although carbon dioxide emissions increased by 20.28%,the global warm-ing potential of soil greenhouse gas emissions decreased by 9.47%.Additionally,the rate of soil organic carbon mineralization was significantly reduced.In conclusion,the application of biochar can significantly promote car-bon sequestration and emission reduction in farmland soils,thus,its widespread adoption not only benefits soil improvement but also contributes to the achievement of the"carbon peaking and carbon neutrality"goals.
biocharsoil carbon sequestrationgreenhouse gas emissionMeta analysis
万方数据
维普
