设施高灌蓝莓光合特性研究

以高灌蓝莓品种‘喜来’(Vaccinium corymbosum‘Sierra’)为试材,对设施高灌蓝莓的光合特性进行了研究。结果表明,设施内光合有效辐射(PAR)及叶面温度(TL)分别于12∶00和13∶00达到最大值,高灌蓝莓叶片的净光合速率(Pn)于早晨8∶00达到最大值,之后持续降低,在15∶00~16∶00有小量回升,之后再次降低。气孔导度(Gs)日变化与Pn变化趋势相同,而细胞间隙二氧化碳浓度(Ci)的变化趋势与之相反。高灌蓝莓叶片的光饱和点为600μmol/(m2·s),光补偿点为62.6μmol/(m2·s),CO2补偿点为129.8μL/L,在温室高温弱光环境下,温度是Pn的主要限制因子,温度在28℃以上时高灌蓝莓的光合作用受到严重抑制,该抑制是气孔因素与非气孔因素共同影响的结果。

Study on Photosynthetic Characteristics of Highbush Blueberry in Greenhouse

Using Vaccinium corymbosum‘Sierra’ as material, the photosynthetic characteristics of high-bush blueberry in greenhouse were studied .The results showed that the photosynthetically active radiation （ PAR） and leaf temperature （ TL） reached the maximum at 12∶00 and 13∶00 respectively .The net photosyn-thetic rate （ Pn ） reached the maximum at 8∶00 , and then decreased steadily .There was a small upturn at 15∶00~16∶00 and then decreased again .The daily variation of the stomatal conductance （ Gs） was the same with that of Pn, but that of intercellular CO2 concentration （Ci） was on the contrary.The light saturation point was 600 μmol/（m2＆#183; s）, the light compensation point was 62.6 μmol/（m2＆#183; s） and the CO2 compensation point was 129 .8 μL/L.Temperature was the major limiting factor of Pn under high temperature and low light conditions.When the temperature was higher than 28℃, the photosynthesis was seriously restrained , which was caused by the multi -effects of stoma and non -stoma restriction factors .