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1990年春季,我们对生长在本所庭院内的一棵树龄约20年的山麻杆(Alchornea davidii Franch)的叶片颜色进行了连续采样观察,同时对花青素做了定性分析,还测定了花青素、叶绿素相对含量及叶计pH值的变化,叶片颜色观察根据中国科学院编译的《色谱》(科学出版社,1957年)进行。结果(表1)如下:1.开春后新长出的叶片为浅草黄色,以后叶片颜色逐渐经历变红再转绿的变化过程。2.山麻杆叶片中的红色素是花青素.3.随着叶片由红变绿,其中花青素含量由高变低,甚至检测不出,而叶绿素含量则由低变高,直至稳定在一个较高的水平上,观察期间叶计的pH值虽有下降,但变化幅度不大,一直处在酸性范围内的5～6之间。说明山麻杆叶片之所以呈现鲜红色乃是含有花青素和叶计处于酸性状态造成的,而其黄
In the spring of 1990, we continuously observed the leaf color of an Alchornea davidii Franch, aged about 20 years, grown in our courtyard. At the same time, qualitative analysis of anthocyanin was carried out. Anthocyanins, chlorophyll relative content and leaf pH value changes, the leaf color observation compiled by the Chinese Academy of Sciences, “Chromatography” (Science Press, 1957). The results (Table 1) are as follows: 1. After the spring new leaves grow asakusa yellow, after the leaf color gradually reddening turn green change process. 2. Hill Ma spike red pigment anthocyanin.3.As the leaves from red to green, which anthocyanin content from high to low, or undetectable, while the chlorophyll content from low to high until Stabilize at a higher level. Although the pH value of leaf meter decreased during the observation period, the change range was not large, and it remained between 5 and 6 in the acidity range. The reason why the mountain Ma pole leaves appear bright red but with anthocyanin and leaf meter in acidic state caused, and its yellow