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以3种常见冷季型草坪草——白三叶(Trifolium repens)、草地早熟禾(Poa pratensis)和苇状羊茅(Festuca arundinacea)为实验材料,利用开顶箱(OTC)模拟法,研究了这些草坪草在高浓度O3(80和120 nmol·mol-1)处理下生理生态指标的变化。结果表明:3种草坪草随O3胁迫加剧,呈现不同的伤害症状,其中,白三叶在熏蒸前期最先出现黄褐色点状伤斑。高浓度O3显著抑制了3种草坪草植株的生长。与对照相比,高浓度O3处理下显著提高了3种草坪草叶片中丙二醛(MDA)含量及SOD活性(88%、74%、47%)与POD活性(136%、5%、9%)(P<0.05)。草地早熟禾与苇状羊茅的脱落酸(ABA)含量随O3浓度升高而升高,而白三叶的ABA含量则呈现出先升高后降低的趋势。研究表明:白三叶对高浓度O3最为敏感,可用于做臭氧的指示植物;苇状羊茅对O3的敏感性最低,抗性最强。
Trifolium repens, Poa pratensis and Festuca arundinacea were used as experimental materials and OTC simulation was used to study The physiological and ecological changes of these turf grasses under high concentrations of O3 (80 and 120 nmol · mol-1) were studied. The results showed that the three kinds of turf grasses were exacerbated with O3 stress and presented different injury symptoms. Among them, the white clover was the first to appear yellow-brown spot-like lesion in the early stage of fumigation. High concentrations of O3 significantly inhibited the growth of three turfgrass plants. Compared with the control, the content of malondialdehyde (MDA) and SOD activity (88%, 74%, 47%) and POD activity (136%, 5%, 9 %) (P <0.05). Abscisic acid (ABA) content increased with the increase of O3 concentration, while the ABA content of white clover increased firstly and then decreased. The results showed that white clover was most sensitive to high concentration of O3 and could be used as indicator plant of ozone. The reed fescue had the lowest sensitivity and the strongest resistance to O3.