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在田间条件下,对同一植株接穗红■(Loropetalum chinense var.rubrumYieh)和其砧木■(Loropetalum chinense Oliver.)上发出的叶片光合特性进行了研究。结果表明:①在8月中旬,天气晴朗的条件下,2种植物净光合速率(Pn)和蒸腾速率(Tr)均呈双峰曲线;气孔导度(Cond)均呈单峰曲线;胞间CO2浓度(Ci)均呈单谷曲线;Pn日均值■木大于红■木。②红■木的光饱和点(LSP)、光补偿点(LCP)、CO2饱和点(CSP)均低于■木,CO2补偿点(CCP)高于■木;③红■木的表观量子效率(AQY)、羧化效率(CE)均低于■木,故红■木的光合能力低于■木。④2种植物固碳释氧能力相比较,红■木低于■木,故而建议在居民小区和人群聚集地进行绿化时,宜适当减少红■木的使用。
Under field conditions, photosynthetic characteristics of leaves from the same plant Loropetalum chinense var. RubrumYieh and its rootstock Loropetalum chinense Oliver. Were studied. The results showed as follows: ①In the middle of August, the net photosynthetic rate (Pn) and transpiration rate (Tr) of the two plants showed a bimodal curve in the clear weather; the stomatal conductance (Cond) CO2 concentration (Ci) showed a single-valley curve; Pn daily average ■ wood is greater than red ■ wood. ② Red ■ Light saturation point (LSP), light compensation point (LCP) and CO2 saturation point (CSP) were all less than ■ wood, CO2 compensation point (CCP) was higher than ■ wood; ③ red ■ apparent quantum of wood Efficiency (AQY), carboxylation efficiency (CE) are lower than ■ wood, so red ■ wood photosynthetic capacity is lower than ■ wood. ④ Compared with the ability of carbon fixation and oxygen release of two species of plants, red ■ wood is lower than wood, therefore, it is suggested that the use of red wood should be properly reduced when residential areas and people gather for greening.