农田开放体系中调控臭氧浓度装置平台(O3-FACE)研究

Ozone Concentration Enrichment System Under Fully Free-air Condition in Agricultural Field(O_3-FACE)

本研究研制建立了亚洲第一个稻麦轮作的O3-FACE平台系统。平台主要由O3供应系统、O3释放系统以及平台监控系统3大部分组成;FACE圈O3目标浓度设定值为高于对照圈O3浓度50%;系统根据风向、风速、FACE圈内中心点O3浓度值等因素控制布气。平台运行3年以来,85%以上布气时间内,平台控制区域O3浓度波动在控制目标值的±15%之内;90%以上布气时间内,平台控制区域O3浓度波动在控制目标值的±20%之内。FACE圈内O3浓度分布基本随风向由边向中心逐步降低,作物生长季内圈内O3浓度分布与控制中心点的O3浓度相比,变幅小于±10%。在低风速条件下(风速<0.3 m/s),80%布气时间内,平台控制区域O3浓度波动在控制目标值的±20%之内。

The first Free Air Ozone Concentration Enrichment system （O3-FACE） was established in Asia under rice-wheat rotation system. The O3-FACE included O3 gas supply unit, O3 gas controlled-release unit and system communication and monitoring unit. The target O3 concentration for the FACE plots was 50% higher than the instantaneous ambient O3 concentration in the control plots. The O3 gas release was controlled at each FACE ring with a logic based on wind direction, wind speed and O3 concentration at the center of the plot. Based on 3 years results, the achieved fluctuation of O3 concentration was within ±15% of the target value for 85% of the time, and within ±20% of the target value for 90% of the time. The O3 concentration reduced in the FACE ring from border to center along the main wind direction. The variation of O3 distribution in FACE ring was lower than ＊10% compared with O3 concentration at the center of the plot. The achieved fluctuation of O3 concentration was within ±20% of the target value for 80% of the time under low wind speed condition （wind speed〈0.3 m/s）.