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Advisor(s)
Abstract(s)
Abstract The present field experiment was conducted
during two consecutive cropping seasons in central Portugal
to study the effects of simultaneous elevation of carbon
dioxide concentration ([CO2]) (550 lmol mol-1
) and air
temperature (?2–3 C) on japonica rice (Oryza sativa L.
‘‘Ariete’’) yield, crop duration, and SPAD-values across the
seasons compared with the open-field condition. Open-top
chambers were used in the field to assess the effect of elevated
air temperature alone or the combined effect of elevated
air temperature and atmospheric [CO2]. Open-field
condition was assessed with randomized plots under
ambient air temperature and actual atmospheric [CO2]
(average 382 lmol mol-1
). Results obtained showed that
the rice ‘‘Ariete’’ had a moderate high yielding under open-
field condition, but was susceptible to air temperature rise of
?2–3 C under controlled conditions resulting in reduction
of grain yield. The combined increase of atmospheric [CO2]
with elevated air temperature compensated for the negative
effect of temperature rise alone and crop yield was higher
than in the open-field. SPAD-readings at reproductive stage
explained by more than 60 % variation the straw dry matter,
but this finding requires further studies for consolidation. It
can be concluded that potential increase in air temperature
may limit rice yield in the near future under Mediterranean
areas where climate change scenario poses a serious threat,
but long term field experiments are required.
Description
Keywords
SPAD-reading Maturation duration Modeling Open-field Open-top chamber
Citation
Figueiredo N., Carranca C., Trindade H., Pereira J., Goufo P., Coutinho J., Marques P., Maricato R., de Varennes A., 2015. Elevated carbon dioxide and temperature effects on rice yield, leaf greenness, and phenological stages duration. Paddy and Water Environment 13 (4): 313-324.
Publisher
Springer