刘树华,麻益民. 1997. 农田近地面层CO2和湍流通量特征研究[J]. 气象学报, 55(2):187-199, doi:10.11676/qxxb1997.020
农田近地面层CO2和湍流通量特征研究
THE CHARATERISTICS OF CO2 CONCENTRATION AND FLUX,TURBULENCE FLUXES IN THE NEAR SURFACE LAYER OVER THE WHEAT FIELD
投稿时间:1994-11-09  修订日期:1996-09-12
DOI:10.11676/qxxb1997.020
中文关键词:  CO2浓度和通量  净辐射通量  感热和潜热通量  动量通量  光合有效辐射
英文关键词:CO2 concentration and flux  Netradiation flux  Sensible heat and latent heat fluxes  Momentum flux  Photosynthetically active radiation
基金项目:
作者单位
刘树华 北京大学地球物理系, 北京, 100871 
麻益民 澳大利亚Murdoch大学环境科研系, 佩思 
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中文摘要:
      利用1985年5月至6月在北京郊区中国科学院农业生态试验研究站的麦田中实测的小麦不同生长期的CO2浓度梯度、光合有效辐射、净辐射、土壤热通量和温度、湿度及风速梯度等量的数据,采用空气动力学方法,计算了CO2通量、感热通量、潜热通量和动量通量。并对观测场地、仪器设备、校准方法及误差分析进行了描述。结果表明:从5月14日到6月15日,在1m,2m和10m处,CO2浓度振幅的日变化分别为103.4到27.5,87.5到27.3和69.8到11.5ppm;光合型和呼吸型的平均CO2浓度分别为345.3,350.6,357.5ppm和373.9,369.7,362.1ppm.在白天,CO2通量和梯度的输送方向是从大气向植被,在中午(11时到13时)输送达到负的最大值。在夜间,CO2通量和梯度输送的方向与白天相反,并且,在早晨(4时到6时)达到正的最大值。CO2通量与净辐射(Rn)、可利用能(H+LE)、光合有效辐射和动量通量之间有较好的相关关系。
英文摘要:
      The gradient of CO2 concentration, photosynthetically active radiation, netradiation, soil heat flux, profiles of wind speed, and air temperature and humidity were mea-sured above a wheat field during May and June 1985 at Beijing Agro-Ecosystems Experimental Station, Chinese Academy of Sciences. Fluxes of carbondioxide, sensible heat, latent heat and momentum were calculated by using the aerodynamic method. The obser-vation site, equipment, calibration techniques, and the errors associated with the mea-surement, and the computational procedures are described. The results show that the diurnal variations of the amplitude of CO2 concentration were 103.4 to 27.5, 87.5 to 27.3, and 69.8 to 11.5 ppm;the average CO2 concentrations were 345.3, 350.6 and 357.5 ppm for the photosynt hesis type, and 373.9, 369.7 and 362.1 ppm for the respiration type at 1m, 2m and 10m above surface, respectively, from May 14 to June 15. During the day, transfer direction of the CO2 fluxes and gradients was from air to cropcanopy, and atnoon(11 to 13 hour) the transfer rate reaches negative maximum value. Atnight, transfer of the CO2 fluxes and gradients was in the reversed direction and reaches positive maximum in the early morning(4 to 6 hour). There are strong correlation between CO2 flux and the netradiation(Rn) , available energy(H+LE) , photosynthetically active radiation and momentum flux.
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