Landolt W, Bühlmann U, Bleuler P, Bucher J B
Swiss Federal Institute of Forest, Snow and Landscape Research, CH-8903 Birmensdorf, Switzerland.
Environ Pollut. 2000 Sep;109(3):473-8. doi: 10.1016/s0269-7491(00)00050-6.
Current-year seedlings of beech, ash, Norway spruce and Scots pine were exposed during one growing season to different, but moderate, ozone (O(3)) scenarios representative for Switzerland (50, 85, 100% ambient, 50% ambient+30 nl l(-1)) in open-top chambers (OTCs) and to ambient O(3) concentrations in the field. Biomass significantly decreased with increasing O(3) dose in all species except for spruce. Losses of 25.5% (ash), 17.4% (beech), 9.9% (Scots pine) were found per 10 microl l(-1) h accumulated O(3) exposure over a threshold concentration of 40 nl l(-1) during daylight hours (AOT40). Ratios of root/shoot biomass (RSR) also significantly decreased with increasing AOT40 levels in beech and ash, but not in Norway spruce and Scots pine. The data show that the deciduous species beech and ash were more susceptible to O(3) with respect to RSR and biomass than the coniferous species Norway spruce and Scots pine.
在一个生长季节中，将山毛榉、白蜡树、挪威云杉和苏格兰松当年生的幼苗，置于开顶式气室（OTC）中，使其暴露于代表瑞士不同但适度的臭氧（O₃）情景（50%、85%、100%环境浓度、50%环境浓度 + 30 nl l⁻¹）下，并使其在田间暴露于环境O₃浓度下。除云杉外，所有物种的生物量均随O₃剂量增加而显著下降。在白天，每10微升 l⁻¹ 小时累积O₃暴露量超过40 nl l⁻¹ 的阈值浓度（AOT40）时，发现白蜡树损失25.5%、山毛榉损失17.4%、苏格兰松损失9.9%。在山毛榉和白蜡树中，根/茎生物量比（RSR）也随AOT40水平的增加而显著降低，但挪威云杉和苏格兰松则不然。数据表明，就RSR和生物量而言，落叶树种山毛榉和白蜡树比针叶树种挪威云杉和苏格兰松对O₃更敏感。
