Effects of double CO2 partial pressure on the canopy potential photosynthesis of Oryza sativa and Leptochloa panicea

Abstract

Abstract: The light-saturated rate of photosynthesis, apparent photosynthetic quantum yield and the efficiency of light energy conversion increased in leaves of O. sativa, exposed to double CO₂ partial pressure and the same parameters were decreased in leaves of L. panicea in comparison with that under ambient CO₂ partial pressure. The carboxylation rate and oxygenation rate of Rubisco increased simultaneously and the ratio between them did not change much in leaves of O. sativa. No significant change of CO₂ compensation point in the absence of light respiration(Γ^*)occurred in O. sativa and increasing Γ^* was found in L. panicea. The result showed that the property of Rubisco could be modified in L. panicea exposed to double CO₂ partial pressure. The respiration rate in light decreased in both plants exposed to double CO₂ partial pressure maximurn carboxylation rate of rabisco.(Vcmax)and maximum rate of photo synthetic elactron transprt(Jmax)increased by 9.3% and 20.7% in O. sativa and decreased by 5.7% and 3% in L. panicea respectively as they were exposed to double CO₂ partial pressure. The daily canopy net photosynthesis increased by 5% in O. sativa and decreased by 13% in L. panicea when both were exposed to double CO₂ partial pressure. The results showed that the species characters influence carbon gained under higher CO₂ partial pressure. The advantage in higher production in O. sativa would be promoted as the global atmospheric CO₂ partial pressure would increase continuously, and the current ecological relationship between O. sativa and L. panicea be changed for the carbon assimilation in L. panicea decreased under double CO₂ partial pressure.

Key words: Jujube orchard, Arthopod, Community structure, Temporal dynamic, Fuzzy clustering

CLC Number:

Q948.11

SUN Guchou, ZHAO Ping, ZENG Xiaoping, PENG Shaolin. Effects of double CO₂ partial pressure on the canopy potential photosynthesis of Oryza sativa and Leptochloa panicea[J]. cje, 2003, (4): 1-5.

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Effects of double CO₂ partial pressure on the canopy potential photosynthesis of Oryza sativa and Leptochloa panicea

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