How do increasing background concentrations of tropospheric ozone affect peatland plant growth and carbon gas exchange?

In this study we have demonstrated that plants originating from upland peat bogs are sensitive to
increasing background concentrations of ozone. Peatland mesocosms from an upland peat bog in North
Wales, UK were exposed to eight levels of elevated background ozone in solardomes for 4 months from
May to August, with 24 h mean ozone concentrations ranging from 16 to 94 ppb and cumulative
AOT024hr ranging from 45.98 ppm h to 259.63 ppm h. Our results show that plant senescence increased
with increasing exposure to ozone, although there was no significant effect of increasing ozone on plant
biomass. Assessments of carbon dioxide and methane fluxes from the mesocosms suggests that there
was no change in carbon dioxide fluxes over the 4 month exposure period but that methane fluxes
increased as cumulative ozone exposure increased to a maximum AOT 024hr of approximately 120 ppm h
and then decreased as cumulative ozone exposure increased further.