Study on Photosynthetic Physiology Characteristics of Young Phoebe sheareri Seedling

In order to make clear the photosynthetic characteristics of P.sheareri seedling,which can provide certain theoretical basis for the seedling technique of P.sheareri.The P.sheareri seedling by sowing as experiment materials,the photosynthetic characteristics,transpiration characteristics and photosynthetic parameters were determined. The results showed that the diurnal change of net photosynthetic rate of P.e sheareri seedling was bimodal curve and the diurnal change of transpiration rate was double-peak curve.Moreover,midday depression existed.The daily average net photosynthetic rate was 3.30μmol/(m2·s).The average solar utilization efficiency(SUE)of P.sheareri was merely 0.11%,and the average water utilization efficiency(WUE)of it was 1.94μmol/μmol.The apparent quantum yield(AQY)of P.sheareri reached 0.047,which was relatively high.The light saturation point(LSP)and the light compensation point(LCP)was 1 140.82μmol/(m2·s),13.495μmol/(m2.s)respectively.The CO2compensation point and CO2saturation point was 73.318μmol/(m2·s),1 571.202μmol/(m2·s)respectively.According to the parameters above,the study reveals that the P.sheareri seedling is shade tolerant.Hence,it is beneficial for the better growth of P.sheareri seedling to choose the shady and damp places.