目的 延长油菜贮藏保鲜期。 方法 以油菜为试材，以聚乙烯(PE)为包装薄膜，研究在 5 种不同体积分数的气体配比下油菜各项生理生化指标变化。 结果 在 4 ℃下，初始气体 O2， CO2， N2的体积分数为 5%， 8%， 87%时，可有效抑制 POD 和 PPO 活性，电导率上升，降低呼吸强度、失重率、维生素 C 的损失，减缓叶绿素的降解，贮藏时间可延长至 35 d，具有良好保鲜效果。

This work aimed to prolong the preservation time of Brassica campestris L. The effect of five different proportional gas concentrations on physiological and biochemical changes of Brassica campestris L at 4 ℃ were investigated using PE as packaging materials in this paper. The results showed that the treatment with O2 5%, CO2 8%, N2 87% could effectively inhibit the activity of peroxidase (POD ) and polyphenol oxidase (PPO), enhance the conductivity, and decrease respiration rate, weight loss rate, loss of vitamin C and degradation of chlorophyll. The preservation time was extended to 35 days and it had a better preservation effect.