五种高山藏医药用植物茎叶的结构特征研究

A STUDY ON ANATOMICAL CHARACTERISTICS OF LEAVES AND STEMS OF FIVE ALPINE PLANTS USED FOR TIBETAN MEDICINE IN QINGHAI-TIBETAN PLATEAU

通过对青藏高原东北部３８００ｍ至５１００ｍ处生长的五种高山藏医药用植物茎叶的解剖观察发现，这些植物的叶表皮单层，气孔不下陷，但叶肉中的栅栏细胞多层，有的叶表面密被表皮毛、角质膜厚，茎叶中普遍形成发达的通气组织。这些特征是高寒地区空气稀薄、气温低、日照辐射强等外界条件长期作用的结果。

Five alpine plants used for traditional Tibetan Medicine in Qinghai-Tibetan plateau were anatomically studied. It was shown that the leaf surfaces of some of the plants were covered with trichomes or thick cuticular layers and that the stomata of all the plants were the same as those of mesophyte, without trapping in the leaf surfaces. It was also shown that the leaves of these plants were only of epidermis of one-layer cells and palisades with multi-layer cells and that the well-developed arenchyma appeared inside of their leaf mesophyll and stems. We think that these characteristics resulted from the hash ecological factors,such as lack of oxygen,strong solar radiation and low temperature, in Qinghai-Tibetan plateau.