2000年秋季以4个不同叶色类型的黄栌（“黄”、“橙红”、“紫红”、“红”）为材料，调查其在秋季变色期叶片内的花青素相对含量、可溶性糖含量和Ph值的变化。结果表明： 不同叶色类型黄栌的花青素相对含量都呈先上升后下降的趋势，均在10月24日达最高峰，其中“紫红”的含量最高，达306.55个色素单位，而“黄”的含量最低，仅42.25个色素单位。不同叶色类型黄栌叶片间可溶性糖含量不存在显著差异，均在叶色变化过程中降低。“紫红”的Ph值低于“黄”的，存在显著差异（P<0.05），且同一株树上绿色叶片的Ph值明显高于红色叶片。通过1998，1999和2001年3年叶色改善试验，发现喷施的不同植物生长调节剂中以500 mg·Ｌ－１乙烯利效果最佳，花青素相对含量达到最高，且叶绿素含量缓慢下降，由此可见，施用适当浓度的乙烯利有利于延长红叶的观赏期。
The content of anthocyanin, soluble sugar and pH value in Cotinus coggygria leaves of four different types of leaf colors (“yellow”, “orange red”, “purple red”, “red”) were studied during the leaf color change in autumn of 2000. The results showed that the relative content of anthocyanin in all types increased at start and then decreased. All of them reached to a peak value on 24th October. The “purple red” type had the highest relative content of anthocyanin with 306.55 pigment units, while the “yellow” type had the lowest with 42.25 pigment units. The content of soluble sugar in each type had no significant difference and decreased during the leaf color change. The pH value of “purple red” was lower than that of “yellow” type, and the difference was significant (P<0.05). The pH value of green leaves was obviously higher than that of red leaves in the same tree. Of all the growth regulators applied in three years (1998, 1999, 2001), ethephon increased most the pigment of anthocyanin with the treated concentration of 500 mg·Ｌ－１, and the content of chlorophyll in the leaves decreased slowly. It indicated that the ethephon of appropriate concentration is beneficial to extend the ornamental period of the colored leaves.
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