西藏尖叶对齿藓形态特征与环境变化的关系及响应策略  

Relationship between morphological characteristics of Didymodon constrictus and environmental changes in Xizang and its response strategies

作　　者：王丽丽 宋晓彤 谷际岐 邵小明[2,3] WANG Li-Li;SONG Xiao-Tong;GU Ji-Qi;SHAO Xiao-Ming(Lyuliang University,Lüliang,Shanxi 033001,China;College of Resources and Environmental Sciences,China Agricultural University,Beijing 100193,China;and 3College of Resources and Environmental Sciences,Xizang Agricultural and Animal Husbandry University,Nyingchi,Xizang 860000,China)

机构地区：[1]吕梁学院,山西吕梁033001 [2]中国农业大学资源与环境学院,北京100193 [3]西藏农牧学院资源与环境学院,西藏林芝860000

出　　处：《植物生态学报》2024年第10期1351-1360,共10页Chinese Journal of Plant Ecology

基　　金：国家自然科学基金(41771054和31570474)。

摘　　要：西藏是全球气候变化最为敏感的区域之一,苔藓植物则是对环境变化敏感的指示植物。该研究以在西藏广布的尖叶对齿藓(Didymodon constrictus)为对象,探讨其形态性状与气候、土壤、植被等环境因子的关系,分析苔藓植物对环境变化的响应策略,为揭示苔藓植物对环境变化的响应机制以及制定西藏苔藓植物保护对策提供参考。整理2007–2015年西藏采集的尖叶对齿藓标本,每份标本取6株,观测其植株、叶片和叶细胞相关形态指标,并通过Pearson和冗余分析分析其与环境的关系。结果显示:随着海拔升高,尖叶对齿藓出现植株矮小、叶片卵圆状、细胞壁增厚的现象。气温升高且降水丰富时,尖叶对齿藓植株高大,叶片细长,中肋粗壮,细胞壁变薄。太阳辐射增大时其叶片倾角减小。研究表明对尖叶对齿藓影响较大的环境因子包括年平均气温、年降水量和太阳辐射强度等。株高、叶面积和叶片倾角大小对环境变化的响应较为敏感,而细胞水平上则优先选取叶细胞面积和细胞壁厚度作为衡量指标。综上,苔藓植物各个形态性状之间联系密切,并通过联合改变来协同响应环境变化。Aims Xizang is one of the most sensitive regions to global climate change,and bryophytes are sensitive indicator plants to environmental change.This study investigates the relationship between morphological traits and environmental factors such as climate,soil,and vegetation of Didymodon constrictus,which is widely distributed in Xizang.It analyzes the response strategies of bryophytes to environmental changes,providing reference for revealing the response mechanisms of bryophytes to environmental changes and formulating protection strategies for bryophytes in Xizang.Methods Specimens were collected from Xizang from 2007 to 2015,and valid specimens of D.constrictus with a certain spatial distance were confirmed.Six mature plants were selected from each specimen and the morphological traits of plant height,leaves and related cells were measured.Pearson and redundancy analysis methods were used to analyze their relationships with the environmental conditions.Important findings With the altitude increases,the plants become shorter,the leaves tend to be ovoid and the cell walls thicken.As the air temperature rises and precipitation is abundant,the plants become taller,the leaves are elongated,the midribs are short,and the cell wall are thinner.When solar radiation increases,the angle of leaf inclination on the stem decreases.The results also showed that the environmental factors that have a significant impact on the growth of D.constrictus,including annual mean air temperature,annual precipitation,and solar radiation.The response of plant height,area of leaf,and angle of leaf to environmental changes is relatively sensitive,while at the cellular level,area of leaf cell and cell wall thickness are preferred as measurement indicators.We consider that plant height,leaf area and leaf inclination are more sensitive to environmental changes,while leaf cell area and cell wall thickness are preferred as measures at the cellular level.In summary,the various morphological traits of moss plants are closely related and moss plan

关 键 词：尖叶对齿藓 苔藓形态 环境因子 响应策略 西藏 

分 类 号：Q94[生物学—植物学]