关键词: 生物炭, 氧化亚氮还原, 氮气, 反硝化产物比

Abstract:

Soil denitrification is an important pathway of soil nitrogen loss. The large amount of nitrogen fertilizer applied in agricultural production leads to the increase of soil N₂O emission, and it has caused environmental problems such as the enhanced greenhouse effect. At the same time, soil denitrification is also the main way of N₂O reduction, so controlling the ratio of soil denitrification products N₂O/(N₂O+N₂) is the key to reduce soil N₂O emission. Based on a large quantity of relevant researches, this paper summarized the measurement methods and influencing factors of denitrification product ratio in soil and the mechanism of biochar addition affecting soil denitrification product ratio. The results showed that there was still existing uncertainty about the effect of biochar application on denitrification product ratio, and whether biochar addition could effectively regulate denitrification product ratio and reduce N₂O emission was affected by some influencing factors, such as soil physicochemical properties, biochar properties and application amount. Based on the above research status, the future prospects for improving the measurement methods of denitrification products and clarifying the quantitative effects of biochar addition denitrification products ratio and its key influencing factors were proposed.

Key words:

"> Biochar, Nitrous , oxide , reduction, Nitrogen, Denitrification product ratio ,