关键词: 红檵木, 檵木, 光合生理特性, 固碳释氧木

Abstract: The leaf photosynthetic physiological characteristics of cion Loropetalum chinense var. rubrum and Loropetalum chinense which were the rootstock were studied in the field condition. The results showed that:①The diurnal process of photosynthetic rate and transpiration rate of the two plants changed in a double-peak curve;the diurnal process of stomata conductance and intercellular carbon dioxide concentration of both plants changed in a single-peak curve and a single-vale curve separately;the photosynthetic rate of Loropetalum chinense var. rubrum was lower than that of Loropetalum chinense. ②The light saturation point (LSP), light compensation point (LCP), CO₂ saturation point (CSP) of Loropetalum chinense var. Rubrum were lower than those of Loropetalum chinense, the CO₂ compensation point of Loropetalum chinense var. rubrum was higher than that of Loropetalum chinense. ③The apparent quantum yield (AQ Y), the carboxylation efficiency (CE) of Loropetalum chinense var. rubrum were lower than those of Loropetalum chinense. The photosynthetic ability of Loropetalum chinense var. rubrum was lower than that of Loropetalum chinense. ④The ability to fix carbon and release oxygen of Loropetalum chinense var. rubrum was worse than that of Loropetalum chinense, so a suggestion of reducing cultivation of Loropetalum chinense var. rubrum in the dense populated area was put forward.

Key words: Loropetalum chinense var. rubrum, Loropetalum chinense, photosynthetic characteristics, carbon fixing and oxygen releasing