摘要
为实现原位在线精准监测氨挥发并探究农田氨挥发实时排放特征,本研究将自主研发的基于薄膜梯度扩散的电化学氨气实时传感器(GPMCP)应用于施用基肥和分蘖肥后的水稻田进行氨挥发实时跟踪监测。结果首先证实了农田温室气体(CO_(2),CH_(4)和N_(2)O)均对GPMCP监测结果无影响,表明了GPMCP有较强的抗干扰能力。对基肥和分蘖肥期的氨挥发跟踪监测发现,日间平均氨挥发量约是夜间的3倍,每天的11:00—15:00是氨挥发高峰时段(损失率高达40%)。两肥期均在施肥第2天氨排放量达峰,氨累积排放量为(24.4±6.6)kg·hm^(-2),累积氨损失率为7.7%±2.1%。GPMCP与密闭式抽气法测定的氨挥发结果具有良好正相关性,但由于密闭式抽气法受采样时段限制,其实测值低于GPMCP。与当前常用氨监测法相比,GPMCP更能有效捕捉氨挥发动态变化过程、精准反映氨挥发规律,有望成为农田氨挥发精准监测新技术,极具推广应用潜力。
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(CO_(2),CH_(4),and N_(2)O)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.
作者
李天玲
黄家宇
蒋明昊
李兆兴
汪晨煦
汪正国
邱子健
申卫收
LI Tianling;HUANG Jiayu;JIANG Minghao;LI Zhaoxing;WANG Chenxu;WANG Zhengguo;QIU Zijian;SHEN Weishou(School of Environmental Science and Engineering,Nanjing University of Information Science&Technology,Key Laboratory of High Technology Research on Atmospheric Environment Monitoring and Pollution Control in Jiangsu Province,Jiangsu Atmospheric Environment and Equipment Technology Collaborative Innovation Center,Nanjing 210044,China;EXPEC Technology Development Co.,Ltd.,Hangzhou 310000,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2024年第9期2155-2165,共11页
Journal of Agro-Environment Science
基金
国家自然科学基金面上项目(42377311)。
关键词
膜透过电化学传感技术
氨挥发
原位实时
在线监测
水稻田
membrane diffusion-based electrochemical sensing technique
ammonia volatilization
in-situ real-time monitoring
online monitoring
paddy field
