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在稻麦轮作水稻田建立FACE系统 (Free AirCO2 Enrichment) ,即CO2 浓度的控制和监测系统平台 .利用计算机网络系统对平台的CO2 浓度进行监测控制 ,根据大气中的CO2 浓度、风向、风速 ,作物冠层高度的CO2 浓度及昼夜等因素的变化调节CO2 气体的释放速度及方向 ,实现FACE圈的CO2 浓度高于周围大气CO2 浓度 2 0 0 μmol·mol-1.试验表明 ,影响控制精度的主要因素有风速、作物和土壤呼吸作用和扩散层高度 .经过控制方程参数调整 ,在白天 ,控制精度达到 80 %的时间占总时间的白天达到 83% ,夜晚为6 8% .FACE圈内的CO2 分布基本均匀 .平均CO2 设置浓度白天为 5 5 7mol·mol-1,晚上为 6 0 8mol·mol-1.圈内CO2 浓度分布基本上沿放气管对称分布 ,由边沿向中心逐步降低 .2 0 0 1年水稻生长季节平均控制精度 (TAR)达到白天 1.0 3和晚间 1.0 9.
A Free Air CO2 Enrichment (FACE) system is set up to control and monitor the CO2 concentration in rice-wheat rotation rice fields. The CO2 concentration of the platform is monitored and controlled by the computer network system. Based on the atmospheric CO2 concentration, wind direction, wind speed, crop The change of CO2 concentration at canopy height and diurnal and other factors regulated the release rate and direction of CO2 gas, and the CO2 concentration of FACE ring was higher than that of the surrounding atmospheric CO2 at 200 μmol · mol-1. The results showed that the main influencing factors Factors such as wind speed, crop and soil respiration, and height of diffusion layer. After adjustment of control equations, during the day, the control accuracy reached 80% of the total time during the day and 83% of the total time and 68% at night. The average concentration of CO2 was 577mol · mol-1 in the daytime and 608mol · mol-1 in the evening.The distribution of CO2 concentration in the inner circle was basically symmetrical along the air-releasing tube and gradually decreased from the edge to the center.20 The average control accuracy (TAR) of rice growth season in 2010 was 1.03 in daytime and 1.09 in evening.