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在不同光强处理下,对义安油茶幼苗光合色素含量、叶绿素荧光特性、比叶重、植株的生长特征和生物量分配等指标进行测定分析。结果表明:在光照强度为自然光50%和80%光照下油茶幼苗的植株高度、茎直径和叶面积最大,且与自然光强下的相应指标差异显著,根生物量比及根冠比随着光照强度的减弱显著减小,叶生物量比显著增加;随着光强的加强,义安油茶幼苗叶片的叶绿素a、叶绿素b,类胡萝卜素以及可溶性糖的含量呈下降趋势;随光强的增强叶绿素荧光参数Fo、Fm、ETR呈上升趋势,Fv/Fm和Fv/Fo呈下降趋势。经分析初步认为,自然光下义安油茶幼苗叶片易出现光抑制现象,适当控制光强(约自然光强的50%～80%)对油茶幼苗生长较为适宜。
Under different light intensities, the photosynthetic pigment content, chlorophyll fluorescence characteristics, specific leaf weight, plant growth characteristics and biomass allocation were measured and analyzed. The results showed that the plant height, stem diameter and leaf area of Camellia oleifera seedlings were the largest under the light intensity of 50% and 80% of natural light intensity, and had significant difference with the corresponding indexes at natural light intensity. The root biomass ratio and root / With the increase of light intensity, the contents of chlorophyll a, chlorophyll b, carotenoid and soluble sugar in leaves of Camellia oleifera decreased with increasing light intensity Increased chlorophyll fluorescence parameters Fo, Fm, ETR showed an upward trend, Fv / Fm and Fv / Fo showed a downward trend. According to preliminary analysis, it is easy to appear light inhibition phenomenon under the natural light under the condition of light, proper light intensity control (about 50% ~ 80% of natural light intensity) is more suitable for the growth of Camellia oleifera seedlings.