[Effects of Biochar on Nitrous Oxide Fluxes and the Abundance of Related Functional Genes from Agriculture Soil in the North China Plain].

To explore the effect and mechanism of biochar application in reducing nitrous oxide (NO) content in agricultural soil, from March 27 to June 5 2015, pot experiments were conducted to study the effects of biochar application rates (CK, C1:5%, C2:10%, C3:15%, and C4:30%) (mass fraction) on soil NO fluxes and the functional marker genes ammonia monooxygenase (), , and , which are responsible for nitrification and denitrification. The results revealed the following. ①The application of low doses of biochar (5%) promoted NO emission.