Comparative responses of container- versus ground-grown soybean to elevated carbon dioxide and ozone

摘要: In studies of CO 2 -enrichment effects on plants, the applicability results derived from experiments using container-grown plants for predictions future crop performance in a -enriched atmosphere has been questioned. Concerns also have expressed about plant growth with air pollutant O 3 pot-grown plants. Further, since elevated and co-occur, are required combination gases. this 2-yr experiment, soybean [Glycine max (L.) Merr.] grown large pots (15 21 L) ground were exposed to mixtures open-top chambers. The treatments ambient enrichment approximately 337 μmol mol -1 added 24 h d . Ozone charcoal-filtered (CF) (23 nmol ) 1.5 times levels (71 given 12 Relative aboveground biomass seed yield quite similar compared ground. Elevated increased total mass suppressed it magnitudes both rooting environments. reduced toxic Net photosynthesis (A) was while stomatal conductance (g,) higher ground-grown possibly due better soil moisture status. indicated that planting density environment affected morphology, but relative responses not fundamentally different between