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试验研究了北五味子叶片净光合速率日变化规律。结果表明:北五味子净光合速率日变化呈明显的双峰曲线,峰值出现在11:00和15:00,分别为6.71,4.11μmolCO2m-2s-1,有轻微的光合“午休”现象,北五味子净光合速率中午降低为气孔限制;北五味子蒸腾速率日变化呈单峰曲线,峰值出现在11:00,为1.88mmolm-2s-1;北五味子气孔导度日变化呈双峰曲线,峰值分别出现在11:00,15:00,分别为57.5,45.8mmolm-2s-1;北五味子净光合速率与气孔导度呈极显著正相关(P<0.01),与蒸腾速率呈显著正相关(P<0.05),大气CO2浓度低是影响北五味子净光合速率的主要环境因子。
The diurnal variation of net photosynthetic rate of Schisandra chinensis leaves was experimentally studied. The results showed that the diurnal variation of net photosynthetic rate of Schisandra chinensis showed a bimodal curve with peaks at 11:00 and 15:00, which were 6.71 and 4.11μmolCO2m-2s-1, respectively. There was a slight phenomenon of photosynthesis and lunch break, The net photosynthetic rate of Schisandra chinensis reduced to stomatal limitation at noon. The diurnal variation of transpiration rate of Schisandra chinensis showed a single peak curve with peak at 11:00 at 1.88 mmolm-2s-1. The diurnal variation of stomatal conductance showed a bimodal curve (P <0.01). The net photosynthetic rate was significantly correlated with stomatal conductance (P <0.01) and was positively correlated with transpiration rate (P <0.01) P <0.05). Low atmospheric CO2 concentration is the main environmental factor that affects the net photosynthetic rate of Schisandra chinensis.