关键词: 生物炭, N₂O排放, 机制, 土壤

Abstract: N₂O is one of the main greenhouse gases affecting global climate change, and also plays a catalytic role in the depletion of the ozone layer. Farmland soil is the second largest source of greenhouse gas emissions, and how to reduce its N₂O emissions has become a major subject. Biochar is a high specific surface area and porous material formed by pyrolysis of carbon-rich biomass under anoxic conditions. Biochar has many advantages such as improving soil fertility and promoting crop growth, and has become a current research subject. Its effect mechanisms on farmland N₂O emissions have been studied, but no unified conclusion has been formed. This paper reviewed the N2O emission mechanism and the effects of biochar characteristics, the interaction of biochar and environmental factors on farmland N₂O emissions based on previous studies, and future more gave some research priority recommendations and utilization of biochar on greenhouse gas emissions.

Key words: biochar, N₂O emission, mechanism, soil