Online monitoring of ammonia volatilization in paddy fields using GPMCP
In order to conduct accurate in-situ online ammonia volatilization monitoring and explore the real-time emission characteristics of farmland ammonia volatilization,a self-developed electrochemical ammonia gas sensor based on membrane diffusion(GPMCP)was applied for real-time monitoring of ammonia volatilization in a rice field after fertilization.Firstly,it was verified that three common greenhouse gases(CO2,CH4,and N2O)had no significant impact on GPMCP performance,indicating that the GPMCP has strong anti-interference capability.Additionally,the results of real-time monitoring ammonia volatilization in rice fields after applying base fertilizer and tillering fertilizer using GPMCP showed that the ammonia volatilization in daytime was approximately three times higher than that at night.The period from 11:00 to 15:00 was the peak period of ammonia volatilization,accounting for nearly 40%of the total ammonia volatilization loss.The ammonia emission peaked on the second day of fertilization during both the base fertilizer period and the tillering fertilizer period.The cumulative ammonia emission during the two periods was(24.4±6.6)kg·hm-2,with a cumulative ammonia volatilization loss rate of 7.7%±2.1%.Moreover,GPMCP and the closed-chamber sampling method showed a positive correlation.However,due to the sampling period limitation of the closed-chamber method,the measured ammonia volatilization loss rate was slightly lower than that of GPMCP.Meanwhile,compared with other commonly used monitoring techniques,GPMCP could effectively capture the dynamic changes in ammonia volatilization and accurately reflect the patterns of ammonia volatilization.This method holds promise as a novel technique for precise ammonia volatilization monitoring in farmland,showing great potential for promotion and application.
membrane diffusion-based electrochemical sensing techniqueammonia volatilizationin-situ real-time monitoringonline monitoringpaddy field
万方数据
维普
