| Comments |
"A large number of research papers have summarized
biomass enhancement ratios due to growing
plants in elevated CO2 (Table II). Biomass enhancement
ratios are numerically similar to initial photosynthetic
responses. Enhancement ratios are generally
less for slow-growing than for fast-growing plants,
less for unfertilized than for fertilized plants, less for
plants grown at low temperatures, but similar for
herbaceous and woody species. CO2 responses reported
for single-plant studies generally showed much greater
responses than studies where plants were grown in
entire swards (Table II). Biomass enhancement ratios for
single plants were numerically also much greater than
the enhancement in relative growth rates (compare
with Table II Fig. 3)." |