冰缘区藓类植物叶中肋细胞生态适应性分析

对采自新疆天山一号冰川冰缘区的35种生长在不同生境的藓类植物，分别观察离析后其叶片的中肋导水细胞长、宽，细胞壁厚薄、细胞端尾和纹孔场的数目。湿土面、阴湿岩面、土面和岩面四种生境下的藓类植物叶中肋细胞，随着生境中水分条件由湿到干其细胞长度、细胞宽度和厚度均有变大的趋势；中肋细胞端尾的形式多样，生长在土面的藓类具有多个端尾，具有增强细胞间的联系，有效控制导水和物质交换速度，并提高机械固着和支撑作用。不同生境下叶中肋细胞侧壁的纹孔场数目并无明显差异。中肋细胞的特征反映出其对冰缘区极端而复杂的环境的适应策略，为进一步研究苔藓植物在高寒环境地区的导水机理及生态适应性提供了一定的参考依据。

Ecological Adaption of Leaf Costa of Bryophyte from Alpine Periglacial Region

Thirty-five species of bryophyte were gathered from different habitats of Tianshan No.1 Glacier of Xinjiang. They were isolated and analyzed by nitric acid-chromic acid segregation in lab. Based on the observation, It is deduced that the cell length, cell width and cell wall thickness were relatively larger and larger, the number of pit field were higher associated with the habitats from wet to dry. The end tails have various forms, the leaf costa of bryophyte, especially lived in damp soil and in rock, have a few end tails. It assumed that end tails was active in strengthening cell connection and coordinating the exchange of water and nutrients between cells. There is no significant difference on the number of pit fields of bryophyte from four habitats respectively. The result indicates the adaptive strategies of bryophyte how to survive in alpine environment. This study provides a basis for further researches of the conductivity and ecological adaption of bryophytes in alpine environment.