沙棘根次生结构与生态习性关系的研究

Study on the Relationship between Secondary Structure in Root and Ecological Habits of Hippophe rhamnoides

对沙棘１ａ生根次生结构进行观察，发现其根具有皮层发达、木质部所占比例较小，导管和机械组织趋于简化等湿生植物根的结构特征，与其地上部分具有旱生植物的特征形成明显对照，说明沙棘地上地下部分的结构演化是不平衡的。在沙棘人工林营造中，应根据这一特征进行规划设计，才能提高造林水平。

The observation of the secondary structure in the annual root of Hippophe rham- noides indicated that the root had the hygrophyte characteristics of developed cortex,ess xylem ,simpler vessels and mechanical tessyes , and was significantly contrasted with the aerial part having xerophyte characteristics ,Which showed that the evolution balance be-tween the aevial organ and subterranean organ was not achieved. When the plant was used in artificial forestation ,the characteristics above must be considered in designing in order to raise the forestation level.