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在盆栽条件下，研究了土壤中Ｐｂ、Ｈｇ及其相互作用对烟草叶片活性氧代谢的影响．实验结果表明：随着Ｐｂ、Ｃｄ处理浓度的增加，ＰＯＤ活性逐渐增加，ＳＯＤ开始上升后转而下降，ＣＡＴ活性逐渐下降．它既诱导了活性氧的生成，又影响活性氧清除系统对活性氧的清除能力，结果造成活性氧的产生和清除之间的不平衡，致使相关的生理生化过程紊乱，加速了叶片衰老的进程．Ｐｂ、Ｈｇ对烟草叶片抗氧化酶代谢的影响，两者之间存在着一定的协合作用．
Under pot culture conditions, the effects of Pb, Hg and their interactions on reactive oxygen species metabolism in tobacco leaves were studied. The experimental results showed that with the increase of Pb and Cd concentrations, POD activity increased gradually, SOD began to rise and then decreased, and CAT activity decreased gradually. It not only induces the formation of reactive oxygen species but also affects the ability of active oxygen scavenging system to remove reactive oxygen species. As a result, there is an imbalance between the production and removal of reactive oxygen species, leading to disorder of physiological and biochemical processes and accelerating the process of leaf senescence . Pb, Hg on tobacco leaves antioxidant enzyme metabolism, there is a certain synergy between the two.