Effects of ozone exposure in open-top chambers on poplar ( Populus nigra ) and beech ( Fagus sylvatica ): a comparison

Concentration- and flux-based ozone dose–response relationships for five poplar clones grown in North China

“…This means the capacity of tolerance such as biochemical detoxification or repair may be similar between poplar and European beech/birch. It is somewhat inconsistent with the previous observations reported that fast-growing tree species, such as most poplar clones and hybrids, are more sensitive and responsive to tropospheric O 3 than slower-growing species, such as beech (Bortier et al, 2000;Novak et al, 2003Novak et al, , 2005, because poplar has a relatively high stomatal conductance and thus high O 3 uptake (Pye, 1988;Zona et al, 2014). The comparisons of flux-and concentration-based critical levels between poplar examined in the present study and beech/birch in Europe may also suggest that the same AOT 40 -based critical level cannot be applied for the tree species even with the similar sensitivity to O 3 .…”

The physiological, transcriptional and genetic responses of an ozone- sensitive and an ozone tolerant poplar and selected extremes of their F 2 progeny

“…No significant ozone effect on height was found but in contrast for basal stem diameter a small (À3.2%) but significant negative effect (F 1,132 ¼ 11.24, p < 0.001) of ozone was found similar to that reported in a meta-analysis of forest tree ozone responses (Wittig et al, 2009), indicating that ozone exposure is likely to impact biomass yield. This will require further confirmatory analysis from longer-term studies, but suggests that Populus biomass yield is likely to be detrimentally affected by future increased ozone concentrations, which are consistent with previous reports (Bohler et al, 2007;Bortier et al, 2000;Karnosky et al, 1996;Wittig et al, 2009;Woo and Hinckley, 2005). Such decreases in productivity are likely to be related to decreased photosynthetic activity (Bortier et al, 2000;Coleman et al, 1995;Degl'Innocenti et al, 2007;Lorenzini et al, 1999) and reduced leaf area (Wittig et al, 2009).…”

Elevated ozone negatively affects photosynthesis of current-year leaves but not previous-year leaves in evergreen Cyclobalanopsis glauca seedlings

“…However, the results on the deciduous species indicated that E-O 3 caused larger effects on old leaves of the lower canopy than young leaves of the upper canopy e.g. poplar, silver birch (Bortier et al, 2000;Mäenpää et al, 2011;Reich, 1983), and the developing leaves of silver birch (Betula pendula Roth.) were more tolerant to O 3 than expanded leaves (Pääkkönen et al, 1996).…”