为了探究硒元素缓解土壤中多环芳烃污染对陆生植物苍耳(Xanthium sibiricum Patrin ex Widder)的胁迫作用,选择菲作多环芳烃代表物,通过盆栽实验,研究了土壤中不同菲污染浓度(0,20,80,320 mg·kg~(-1))对苍耳的生长、叶绿素含量、光合参数及叶绿素荧光参数的影响,以及外源性施加硒(0.5 mg·kg~(-1))对上述胁迫效应的缓解作用.结果显示,硒能显著缓解高浓度(320 mg·kg~(-1))菲胁迫下苍耳生物量的减少(p<0.05),同时缓解各浓度菲胁迫下叶片中叶绿素含量的降低;硒还能缓解植物在菲胁迫下净光合速率、气孔导度、胞间CO_2浓度的降低,减缓叶片PSⅡ最大光化学效率、PSⅡ实际光能转化效率、光化学淬灭系数的下降和非光化学淬灭系数的上升.研究表明,土壤中外源性添加硒能保护菲胁迫下苍耳的光合机构,改善其光合功能
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