Carriero G, Emiliani G, Giovannelli A, Hoshika Y, Manning W J, Traversi M L, Paoletti E
IPSP-CNR, Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy.
IVALSA-CNR Laboratory of Xylogenesis, Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy.
Environ Pollut. 2015 Nov;206:575-81. doi: 10.1016/j.envpol.2015.08.014. Epub 2015 Aug 24.
This is the longest continuous experiment where ethylenediurea (EDU) was used to protect plants from ozone (O3). Effects of long-term ambient O3 exposure (23 ppm h AOT40) on biomass of an O3 sensitive poplar clone (Oxford) were examined after six years from in-ground planting. Trees were irrigated with either water or 450 ppm EDU. Above (-51%) and below-ground biomass (-47%) was reduced by O3 although the effect was significant only for stem and coarse roots. Ambient O3 decreased diameter of the lower stem, and increased moisture content along the stem of not-protected plants (+16%). No other change in the physical wood structure was observed. A comparison with a previous assessment in the same experiment suggested that O3 effects on biomass partitioning to above-ground organs depend on the tree ontogenetic stage. The root/shoot ratios did not change, suggesting that previous short-term observations of reduced allocation to tree roots may be overestimated.
这是使用乙二脲（EDU）保护植物免受臭氧（O3）影响的持续时间最长的实验。从地面种植六年之后，研究了长期环境臭氧暴露（23 ppm·h AOT40）对臭氧敏感杨树无性系（牛津）生物量的影响。树木用清水或450 ppm的EDU进行灌溉。臭氧使地上生物量（-51%）和地下生物量（-47%）减少，不过仅对茎和粗根的影响显著。环境臭氧降低了下部茎的直径，并增加了未受保护植株茎部的含水量（+16%）。未观察到木材物理结构的其他变化。与同一实验中先前的评估结果相比表明，臭氧对地上器官生物量分配的影响取决于树木的个体发育阶段。根冠比没有变化，这表明之前关于树木根系分配减少的短期观察结果可能被高估了。
