光强对格木幼苗生长及光合特性的影响

From the effects of light intensity on seedling growth and photosynthetic characteristics of Erythrophleum fordii

以1年生格木为试验材料,设置15%、30%、60%、100%光照强度处理格木,研究格木幼苗生长、干物质积累以及光合特性在不同光强下的特征。结果表明,一定程度的遮荫更有利于格木幼苗的生长,60%光照下格木的苗高、地径的增长量以及各器官的干物质积累均为最大;不同光强对格木的光合特性影响明显,60%光照有利于提高格木叶片的气孔导度和蒸腾速率,一定遮荫可降低叶片净光合速率、水分利用率。

With 1 years old of Erythrophleum fordii seedlings were as experimental materials, treatment of 15%, 30%, 60% and100% light intensity on the seedlings, the growth of seedlings, dry matter accumulation and photosynthetic characteristics under different light intensity were studied. The results show that the degree of shading is more conducive to the growth of the seedlings from the dry matter, 60% light from the height and diameter growth at ground and accumulation in different organs were the highest; different light intensity on photosynthetic characteristics of E. fordii significantly, 60% light can improve the stomatal conductance and transpiration rate of leaves, a certain shade will reduce the net photosynthetic rate and water use efficiency.