鄂尔多斯高原锦鸡儿属植物叶的解剖结构及其生态适应性

Leaf Anatomical Structures and Ecological Adaptabilities of 8Caragana Specieson Ordos Plateau

本文对分布在鄂尔多斯高原不同地带上的8种锦鸡儿属植物的叶片进行了解剖学观察和研究。结果表明,随着从东到西环境干旱程度的增加,锦鸡儿属植物叶肉组织分化出现从两面叶→过渡型→环栅型→全栅型的适应趋势。8种锦鸡儿的旱生结构有:较厚的角质层、表皮细胞含有晶体、连续或不连续的下皮层、细胞中含有鞣质等内含物、发达的栅栏组织、发达的叶脉及机械组织。不同的种采取了各自的适应对策。

Anatomical structures of leaf of the 8 species of Caraganagenus on the Ordos Plateau were observed.The results showed that the differentiation trend of mesophyll tissue was bifacial leaf→transitional form→ring-palisade→total-palisade as the environment was getting drier form east to west. It is a ecological adaptation. The xeromorphic structures of the 8 species of Caragana genus were thicker cuticle\,continuous or notcontinuous hypodermis and epidermal cells containing tannin or crystals,developed palisade tissue\, vein and mechanical tissue.Each species had its own adaptable strategies.