高寒区10种青藓科植物茎结构的生态适应性

Ecological adaptability of stem structure of ten species of Brachytheciaceae in alpine region

该研究对新疆天山一号冰川地区的10种青藓科植物茎的解剖结构进行了光镜和扫描电镜观察。结果表明:它们的茎横切面形状不同,表皮细胞均为1层,内、外皮部分化明显,细胞壁由外向内逐渐变薄,中轴分化明显,所占茎面积的比例、细胞厚度以及大小都不尽相同,大多数种类的细胞壁具有角隅加厚的现象。当茎干时,细胞壁表面的凹陷程度不同,其上具有不同形状的纹饰及附属物,大多数种类的表面有深浅和大小不一的小窝点分布。这些特征在不同属及不同种之间均有差异,反应出对环境的适应性,可作为青藓科植物潜在的分类依据。

The anatomical structures of the stems of ten species of Brachytheciaceae in glacier area of Xinjiang Tianshan Glacier were observed under light microscope and scanning electron microscope（ SEM）. The results showed that the stems had different cross-sectional shapes with one layer of epidermal cells; clearly,the cell wall becomed thinner gradually from the outside to the inside; the central axis was well differentiated; the proportion of stem area,the cell thickness and the size of stem are different,and most cell walls of species had corner thickening. When the stems,the cell wall surface of the degree of depression,which had different shapes of ornamentation and appendages,most types of surface depth and size of small dens distribution. These characteristics in different genera and different species were different,and reflected the adaptability to environment,can be used as a potential classification of Brachytheciaceae plants.