But michelia foveolta had obvious growth dominance under one layer shading , the increasing of plant height is relatively high , there were no significant difference in increased perimeter , branches and leaves dry weight , roots dry weights , the whole dry weights of plant in michelia foveolta between full light and shading treatments 而金叶含笑在一层遮荫处理下表现明多脉青冈和金叶含笑幼苗的光合生理特性研究显的生长优势，其株高增量较多，径粗增量和枝叶干重、根干重、整株干重虽然略低于全光照下，但二者并无显著差异
3 . growth and seasonal variation of physiological characteristics of cyclobalanopsis multinervis and michelia foveolta under different shadings . plant height and perimeter of cyclobalanopsis multinervis were decreased in level of extreme significance , which resulted in decreacing branches and leaves dry weights , roots dry weights , the whole dry weighys of plant under shading 3 、不同遮荫处理下多脉青冈和金叶含笑的生长和生理特性的季节变化遮荫处理极显著地降低了多脉青冈的株高和径粗的增长，因此导致了枝叶干重、根干重及整株干重在遮荫处理下的极显著下降。
So far new variety is deficient and difficult to popularize because it is hard to know the eclolgical adaptability of plants , so we ca n ' t adjust measures to local conditions . in this paper , we systematically studied photosynthetic characteristics , light response characteristics , photosynthetic diurnal variation , growth , biomass , seasonal variation of physiological characteristics and leaf anatomy of cydobalanopsis multinervis and michelia foveolta under different shadings ( full light , one layer shading , two layers shading ) by ecophysiologi cal methods 本研究运用生理生态学的研究方法，选取目前在园林上应用较少的多脉青冈和金叶含笑的幼苗为研究材料，对其在不同遮荫处理下(全光照、一层遮荫、两层遮荫)的光合特性、光响应特性、光合日变化、生长情况、生物量、生理特性的季节变化及叶片形态解剖结构等方面进行了较为全面系统的研究。
Two hundred and seventy - four sites were detected by 15 10 - mer primers , out of which 262 were polymorphic ( 95 . 6 % of the total loci detected ) . all of the materials were clearly distinguished , of which fourteen samples have forty - five typical rapd bands . before the molecular taxonomy was introduced , people never doubted subgenus yulania ' s disrelation with subgenus magnolia and a close relation between subgenus yulania and michelia , as there is in both genera a sameness seen in their prolepsis and powder chambers dehiscing on the side 3 、通过对玉兰亚属rapd扩增谱带的分析，发现该类群具有很高的多态性：多态位点百分率高达95 . 6 ，产生的多态性带数与所用引物数的比例为17 . 6 ， 15条随机引物清楚地分开了31个种类，其中的14个种共有45条特征性带，在利用rapd标记已研究过的类群中，本类群多态性较高。
In the ranges of high light , pn of cydobalanopsis multinervis was higher under full light treatment and pn of michelia foveolta was higher under one layer shading . 2 . photosynthetic diurnal variation of cydobalanopsis multinervis and michelia foveolta under different shadings . the curves of photosynthetic diurnal variation were changed by shading in cyclobalanopsis multinervis and michelia foveolta , pn of cyclobalanopsis multinervis was decreased obviously during daytime 就光响应曲线而言，低光强范围内遮荫处理的2树种幼苗表现出较强的光合能力，在较高光强范围内，多脉青冈在全光照处理下的净光合速率有明显优势，而金叶含笑在一层遮荫处理下的净光合速率较高。
The main results were as follows : 1 . photosynthetic characteristics and light response characteristics of cydobalanopsis multinervis and michelia foveolta under different shadings . pn of cydobalanopsis multinervis was decreased in level of extreme significance by shading . there were no significant difference of pn of michelia foveolta under three light treatments , but pn of michelia foveolta was relatively higher under one layer shading 结果表明： 1 、不同遮荫处理下多脉青冈和金叶含笑的光合特性及光响应特性遮荫处理极显著地降低了多脉青冈的净光合速率，金叶含笑在三种光处理下的净光合速率并无显著差异，但一层遮荫下的净光合速率相对较高。
