光照强度对白簕生长和生理特征的影响

Effects of Light Intensity on the Growth and Physiological Characteristics of Acanthopanax trifoliatus

研究了不同光照强度,即全光照CK(为对照处理,100%)、轻度遮光A(40%)、中度遮光B(20%)和重度遮光C(5%)对白簕的各项生长和生理特征指标,探讨白簕对遮荫环境的适应机制.结果表明:全光照处理情况下,新枝数量高过其它遮光处理,且与A、B无差异.全光照处理枝条平均长度和叶片生长状况最差,显著低于其他遮光处理(p<0.05).白簕在中度遮光处理B下生长良好,生物量相对较高.随着光照强度的减弱,白簕叶片的叶绿素含量增加;丙二醛(MDA)、游离脯氨酸(Pro)和可溶性糖含量降低;可溶性蛋白质先升后降,最低值均出现在重度遮光C处理中.综上,白簕对光强的适应范围较广,但光照过强或者过荫均影响其生长,进行适当的遮光(最佳光强为20%透光率)有利于促进白簕两年生种苗的生长,为白簕的栽培管理和综合利用提供依据.

The effects of different light intensity conditions （100% light CK, light shading A, moderate shading B, severe shading C） on the growth and physiological characteristics of Acanthopanax trifoliatus （L.） Merr, were investigated to inquire its adaptation mechanism to shade environment. The results indicated that the number of new branch of CK was higher than those of other shading treatments. The branches length and leaf growth condition un- der the 100% light were the poorest , and were significantly lower than those of other shadings （p 〈 0.05）. The trifoliatus grew well at B, and the biomass was relatively high. With the weakening of light intensity, the chlorophyll content of leaves of Acanthopanax trifoliatus increased ; the proline content, MDA content and the soluble sugar content decreased; the soluble protein content increased firstly and then decreased, the minimum value was in C. The results suggested that the trifoliatus had a wide range of light adaptability, but neither strong nor weak light was conducive for its growth, and 20% of light intensity was the best light environment for seedlings on the two growth seasons.