English

Abstract

The impact of organic fertilizers on the carbon source/sink balance of tobacco soil ecosystem remains controversial. A two-year field experiment was conducted to investigate the effects of different fertilization treatments(no fertilizer,chemical fertilizer, chemical fertilizer and organic fertilizer) on greenhouse gas (GHG) emissionsincludingsoil carbon dioxide (CO2), nitrous oxide (N2O), ammonia volatilization and comprehensive greenhouse effects. The results showed that tobacco soil ecosystem can be carbon source orsink, depending mainly on the carbon sequestration of the plant. Comparing with chemical fertilizer, the combined application of chemical fertilizer and organic fertilizer increased the CO2emission flux and C emission from soil, and significantly increased the carbon sequestration of tobacco plants. The carbon sequestration function of organic fertilizer was closely related to the carbon accumulation of tobacco plants. Comparedwith the chemical fertilizer, soil ammonia volatilization and N2O emission flux were increased by adding organic fertilizer. Both the soil N emission and the biological nitrogen fixation were increased by organic fertilizer. The greenhouse gas emission intensity(GHGI)of organic fertilizer treatment decreased by 14.60%, a remarkable emission reduction, whilethe tobacco yield of organic fertilizer treatment increased 19.12%. Therefore, increasing organic fertilizer in tobacco planting fields is an important way to promote tobacco yield, carbon sequestration and emission reduction.© 2021 Friends Science Publishers