白海棠不同类型枝条光合能力比较研究

Study on Photosynthetic Ability of Different Shoot Types of White Crabapple

为比较不同类型白海棠枝条光合能力的差异,以白海棠为试材,通过试验测定和数学模拟的方法研究长枝、中枝和短枝的光合能力差异。长枝、中枝和短枝的最大光合速率分别为16.3、14.5、9.68μmol/(m2·s),光量子效率分别为0.053、0.047、0.042μmol/μmol,这说明长枝的光合能力最强,其次为中枝和短枝。计算表明,在高辐射条件下[PAR=1500μmol/(m2·s)],单位地面上长枝叶片的。光合总量为18.82μmol/(m2·s),占整个树冠的73.15%,中枝和短枝只有5.19、1.73μmol/(m2·s)。研究表明,长枝叶片的光合总量最大,这与其较强的光合能力和较大的叶面积有关。

The study aims to explore and compare the photosynthetic ability of different shoot types of whitecrabapple. The ability of photosynthesis of shoot type of white crabapple was studied by measurement andmathematical simulation. The maximal photosynthetic rate of long shoot, middle shoot and short shoot was16.3, 14.5 and 9.68 μmol/（m^2·s）, respectively; and the quanta efficiency of photosynthesis of the three shoottypes was 0.053, 0.047 and 0.042 μmol/μmol, respectively. The results showed that the photosynthesis abilityof long shoot was higher than that of middle and short shoot. The total photosynthesis per unit grand area was18.82, 5.19 and 1.73 μmol/（m^2·s） of long shoot, middle shoot and short shoot, respectively, with PAR equal to1500 μmol/（m^2·s） on the top canopy. The results indicated that long shoot was conducive to improve fruit treephotosynthesis（about 73.15%） with high photosynthetic rate and leaf area.