Responses of native broadleaved woody species to elevated ozone in subtropical China.
Responses of native broadleaved woody species to elevated ozone in subtropical China.
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DOI：
10.1016/j.envpol.2011.12.035
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发表时间：
2012-04
影响因子：
8.9
通讯作者：
Weiwei Zhang;Zhaozhong Feng;Xiaoke Wang;J. Niu
中科院分区：
文献类型：
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作者：
Weiwei Zhang;Zhaozhong Feng;Xiaoke Wang;J. Niu
为了评估亚热带阔叶树种的臭氧敏感性并探索可能的潜在机制，将六种常绿树种和两种落叶本地树种在一个生长季节暴露于经过木炭过滤的空气或升高的 O3（E-O3，〜150ppb）。落叶树种的最初可见症状比常绿树种出现得早得多。最先表现出明显症状的物种的生物量也减少得最多。 E-O3导致两种落叶树种和两种常绿树种（樟树和青冈）的光合作用速率、叶绿素含量和抗氧化能力显着降低，但丙二醛含量显着增加。然而，除C. glauca 外，E-O3 对气孔导度（gs）、总酚和抗坏血酸含量没有显着影响。所有物种之间 O3 敏感性的差异很大程度上归因于特定的叶质量而不是 gs。这表明一些亚热带树种将在不久的将来受到氧气浓度上升的威胁。
To assess ozone sensitivity of subtropical broadleaved tree species and explore possible underlying mechanisms, six evergreen and two deciduous native species were exposed to either charcoal-filtered air or elevated O3(E-O3, ∼150ppb) for one growing season. Initial visible symptoms in deciduous species appeared much earlier than those in evergreen species. The species which first showed visible symptoms also had the largest reductions in biomass. E-O3induced significant decreases in photosynthesis rate, chlorophyll content and antioxidant capacity but a significant increase in malondialdehyde content in two deciduous species and two evergreen species (Cinnamomum camphora and Cyclobalanopsis glauca). Except C. glauca, however, E-O3had no significant effects on stomatal conductance (gs), total phenols and ascorbate contents. Difference in O3sensitivity among all species was strongly attributed to specific leaf mass rather than gs. It suggests that some subtropical tree species will be threatened by rising O3concentrations in the near future.