Abstract:

To understand seasonal dynamic of non-structural carbohydrate (NSC) in evergreen conifers, the authors analyzed the soluble sugar, starch and NSC content of leaf, branch, bark and root system of Picea mongolica from April to October. The results indicate that starch abundance in different organs of Picea mongolica reach the highest point in May, then decrease gradually and maintain at a low level from August to October. This might be reasoned that germination required starch is accumulated through photosynthesis from April to May. The soluble sugar content is slight low in May, raise gradually and reach the highest point in October. However, starch accumulated during the growth season may not account for soluble sugar increment in winter. No significant correlation is detected between Picea mongolica different organs’ starch, soluble sugar, and NSC content to monthly mean temperature and precipitation.

Key words: Picea mongolica, non-structural carbohydrate, seasonal dynamic changes, temperature and
precipitation

摘要：

为更好地了解我国北方常绿针叶树中非结构性碳水化合物(NSC)的季节动态变化规律, 以我国特有树种——沙地云杉(Picea mongolica)为研究对象, 对生长季沙地云杉叶、枝、根、树皮等不同器官中的NSC 含量进行测定。结果显示, 沙地云杉不同器官中淀粉含量的变化规律基本上一致, 5 月达到最大值, 此后逐渐下降, 8—10 月均维持在较低水平, 说明芽萌发时所需的淀粉可能来自4—5 月光合产物的积累; 可溶性糖含量在 5 月略低, 此后逐渐上升, 10 月达到最高, 增加的可溶性糖可能并非来自当年生长期结束前所积累的淀粉。分析结果表明, 温度、降水等气候因子与沙地云杉不同器官中淀粉、可溶性糖及 NSC 含量的相关性并不显著。

关键词: 沙地云杉, 非结构性碳水化合物, 季节动态, 温度和降水