Effects of nitrogen deposition and biochar application on soil N2O fluxes in a Moso bamboo plantation

Abstract

In July 2019-July 2020, we conducted a field trial to examine the effects of nitrogen addition (60 kg N·hm-2·a-1), biochar application (10 t·hm-2), and their combination on soil N2O emission and the relationship between soil N2O emission and environmental factors in a typical Moso bamboo (Phyllostachys edulis) plantation in Hangzhou City of Zhejiang Province. Soil N2O flux of Moso bamboo plantation was measured by the static chamber-gas chromatography technique. The results showed that nitrogen addition treatment increased the annual cumulative N2O emission by 14.6%, while biochar application and the combination treatment reduced it by 20.8% and 10.6%, respectively. Soil N2O flux rate was significantly correlated with soil temperature, NO3--N concentration, urease and protease activities, and soil NH4+-N concentration across all treatments. In conclusion, under the background of nitrogen deposition, the application of biochar would have a significant reduction effect on soil N2O fluxes in Moso bamboo plantations.