Comparative Effects of Straw and Biochar on N2O Emissions from Acidic Soils

Biochar amendment is widely considered as a potential strategy to mitigate soil acidification and N2O emissions. However, the effect of biochar on N2O emissions from acidic soils remains unclear. This study aims to compare the effects of straw and biochar on N2O emissions from acidic soils in tea fields with different cultivation years in South Central China. A 48-day microcosm experiment was conducted with soils from two fields after 5 years (pH = 5.8, slightly acidic) and 15 years (pH = 4.5, acidic) of tea cultivation to examine the N2O emissions in response to straw and biochar amendment. Biochar addition alone significantly increased the soil pH by 1.14 and 0.54 units and further reduced N2O emissions by 28.46