Abstract

Abstract: The net photosynthetic rate (Pn),water use efficiency (WUE),and apparent quantum yield of carbon assimilation of rice leaves were boserved contrastively under ambient air (380μmol·mol^-1 CO₂) and FACE (580μmol·mol^-1 CO₂).The results showed that the observed index under FACEwere significantly higher than those under ambient air.Nevertheless,along with the time of high CO₂ treatment prolonged, the enhancement effect of high CO₂ on net photosynthetic rate declined gradually.At the same CO₂ concentration, Pn and carboxylation efficiency (CE) in rice leaves under FACEwere lower than those under ambient air.Although the stomatal conductances in FACE leaves was obviously lower than that in ambient leaves, their intercellular CO₂ concentrations were not significantly different,which implied that the photosynthetic down regulation in rice leaves grown under FACE was not caused by the decrease of stomatal conductance.

CLC Number:

Q945.11

LIAO Yi, CHEN Genyun, ZHANG Haibo, CAI Shiqing, ZHU Jianguo, HAN Yong, LIU Gang, XU Daquan . [J]. Chinese Journal of Applied Ecology, 2002, (10): 1205-1209.

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