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

作者：Williamson Jennifer L^*; Mills Gina; Hayes Felicity; Jones Timothy; Freeman Chris

来源：Atmospheric Environment, 2016, 127: 133-138.

DOI：10.1016/j.atmosenv.2015.12.004

• Tropospheric ozone
• Methane
• Peatlands
• Wetlands
• Senescence

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 AOTO(24hr) 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 O-24hr of approximately 120 ppm h and then decreased as cumulative ozone exposure increased further.

• 出版日期2016-2