Ozone pollution increases CO2 and N2O emissions in ozone-sensitive wheat system

Abstract

The effects of elevated O3 (EO3) on greenhouse gas (GHG) emissions and global warming potential (GWP) from wheat systems with differential O3 sensitivity are not well understood. The nitrous oxide (N2 O), methane (CH4), and carbon dioxide (CO2) emissions from cropping (CP) and bare soil or root-free (BS) plots, GWP, GWP per unit yield, and biomass and its allocation to belowground between O3 -sensitive (cultivar YN19) and tolerant (cultivar Y15) wheat (Triticum aestivum L.) systems were investigated at EO3 and ambient O3 (AO3) with an open-air O3 fumigation system. Results indicated that a 50% elevation above AO3 significantly reduced belowground biomass of the two cultivars. The EO3 signifi..