Observation and simulation of CO2 and O3 fluxes in the winter wheat fieldbased on micrometeorological method
ZHAO Hui1, ZHENG You-fei1,2, LI Shuo3, YUAN Yue2, HUANG Ji-qing1, LIU Jun2, CAO Jia-chen2
1. Key Laboratory for Aerosol-CloudPrecipitation of China Meteorological Administration, School of Atmospheric Physics, Nanjing University of Information Science and Technology, Nanjing 210044, China;
2. Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044, China;
3. Tongzhou District Meteorological Bureau of Beijing, Beijing 101100, China
Contionous observations of CO2 and O3 fluxes in the winter wheat field in the Yangtze River Delta during the daytime were carried out usingthe eddy covariance technique. We analyzed the variation characteristics of CO2 and O3 concentrations, and fluxes during the growing season of winter wheat. Flux models for CO2 and O3 were employed and parameterizedto predict CO2 and O3 fluxes of winter wheat canopy. Canopy CO2 concentrations and fluxesduring the whole observation period were 372.3~487.1μL/Land -0.4~-40.3μmol/(m2·s)with mean values of 402.6μL/Land -13.4μmol/(m2·s), respectively. Canopy O3 concentrations and fluxes were 4.6~116.6nL/Land -0.2~-20.7nmol/(m2·s)with mean values of 50.9nL/Land -6.8nmol/(m2·s), respectively. The highest CO2 and O3 fluxes were observed in the booting stage and the flowering stage of winter wheat. The photosynthetic capacity of winter wheat was the strongest in these two stages. Therefore, the CO2 and O3 were most absorbed by winter wheat.As a whole the CO2 and O3 fluxes of winter wheat showed similar daily variation patterns. TheCO2 flux was significantly higher in the morning than in the afternoon, while the O3 flux was significantly lower in the morning than in the afternoon. The canopy fluxes andleaf stomatal conductance of winter wheat driven by environmental factors such as temperature, vapor pressure deficit, light intensity, and phonological period showed similar limiting mechanisms. The modified Jarvis multiplication model was used to simulate the CO2 and O3 fluxes, which were compared with the measured CO2 and O3 fluxes. It showed that approximately 62% and 60% variations of CO2 and O3 fluxes, respectively, could be explained bythe modified flux models, whichapplied to the simulation of CO2 and O3 fluxes of winter wheat.
赵辉, 郑有飞, 李硕, 袁月, 黄积庆, 刘俊, 曹嘉晨. 基于微气象学方法的麦田CO2和O3通量的观测与模拟[J]. 中国环境科学, 2020, 40(3): 1038-1048.
ZHAO Hui, ZHENG You-fei, LI Shuo, YUAN Yue, HUANG Ji-qing, LIU Jun, CAO Jia-chen. Observation and simulation of CO2 and O3 fluxes in the winter wheat fieldbased on micrometeorological method. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(3): 1038-1048.
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