中文摘要：

根据水稻田间熏气试验中需要考虑和控制的熏气条件，设计并制作开顶式熏气装置。利用复合式气体检测仪检测熏气箱内不同监测点的SO2浓度，分析监测数据之间的关系，检验熏气箱内浓度的差异性。结果表明，设计的开顶式熏气装置进行熏气实验时，在120cm以下每一个高度范围内SO2浓度检测点的标准差小于1，变异系数小于10％，均为弱度变异。以此熏气装置来研究人工控制条件下大气污染物SO2对水稻的影响是可行的。

英文摘要：

Most experimental work on the effects of air pollutants on plants has been carried out in laboratory or greenhouse growth chamber. In such facilities, the microclimate strongly differs from the field. As there was a strong interaction between climatic factors and the uptake and effects of air pollutants, it was hard to extrapolate observed effects in these facilities to field situations. Field studies of the effects of pollutants on crop were carried out in an open-top chamber to overcome such problems. The construction and operation of the open-top fumigation system for exposing rice to control concentrations of sulphur dioxide was devised according to the fumigation conditions which should be controlled in the field of manual fumigation experiment. SO2 concentration and the spatial variability in exposure concentrations at different points inside the fumigation device were detected by QRAE-PLUS Multi-gas monitor. And standard deviation and variation coefficient of SO2 concentrations were used to test spatial variability in exposure concentrations inside the fumigation chamber. Results showed that standard deviation and variation coefficient of SO2 concentrations was less than 1 and 10% respectively when the point was 120 cm from ground in the fumigation experiments with the open-top fumigation device. Therefore, there was a reasonably uniform distribution of SO2 concentration, and the device was feasible to be used to study the impact of SO2 pollution on rice in field.