PDF《含铅、镉重金属细颗粒物对几种陆生植物的暴露危害》

3、4 的结果来看,对于西红柿和小麦,出苗的抑制率分别 达到了 20%和30%,而平均茎高和鲜重抑制率为负值,说明土壤受暴露污染后,对其种子早期的萌 芽阶段有胁迫和抑制效应,未出苗但已发芽种子及种子初生根的发育受限,进而影响其出苗率.同时,在低浓度条件下,已出苗的植株受到的胁迫效应不明显,甚至出现了刺激作用,这种情况在黄 瓜的平均鲜重上有所表现[40-41] .小麦的种子萌发阶段受到 Pb、Cd 两种污染物协同效应较为明显[42] . 对于玉米来说,表现出较强的环境适应性,生物量在暴露条件下没有显著变化[43] . 由此可见,相比于试验介质中较高的背景浓度,短期、低剂量的含 Pb、Cd 重金属大气细颗粒 物复合污染对于几种受试植物早期幼苗生长的生物胁迫效应不明显(小麦出苗终点除外),在某种程 度上还有积极的刺激作用.然而,对于暴露于真实环境中长期性,低剂量、大范围的细颗粒物重金 属复合性污染对于植物和作物的影响还有待于进一步研究. 致谢:感谢复旦大学环境科学与工程学院杨新教授课题组各位老师和同学们在细颗粒物粒径检测中所提供的帮助. 感谢上海市自然基金对本研究的资助. 通讯作者简介:杨帆(1982―),男,环境科学博士,工程师,主要研究方向为环境污染及环境风险评估. 参考文献(References): [1] Wolf M E, Hidy G M. Aerosols and climate: Anthropogenic emissions and trends for

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