利用农田开顶式气室进行不同O3 浓度处理对白菜影响的试验研究。结果表明 :O3 浓度增加导致白菜黄叶率上升 ,总生物量增长速率下降 ,并可改变光合产物分配模式 ;延长高浓度O3 熏气时间 ,对白菜叶片数、叶面积、产量和外轮叶净光合速率影响较大 ,对心叶和中部叶片净光合速率影响较小 ;对处于不同生长期的白菜进行相同天数高浓度O3 处理 ,经济产量和总生物量的响应 ,前期处理大于后期 ,叶面积则相反 ,对叶片数无影响。 Experimental Study on the Effect of Different O3 Concentration Treatments on Chinese Cabbage by Farmland Open Top Gas Chamber. The results showed that: the increase of O3 concentration led to the increase of cabbage yellow leaf rate and the decrease of total biomass growth rate, and changed the distribution pattern of photosynthate; prolonged the time of high concentration O3 fumigation, the leaf number, leaf area, yield and net photosynthesis The rate of net photosynthetic rate had a little effect on the net photosynthetic rate of the leaves in the middle and the middle leaves. The cabbage at different growth stages was treated with O3 at the same concentration for a long time, the economic yield and biomass were higher than the latter, and the leaf area On the contrary, there is no effect on the number of leaves.