摘要
本文对敦煌西湖荒漠湿地与内蒙古额济纳绿洲河岸林的胡杨叶片进行解剖结构数量化研究,比较了两种不同生境中胡杨叶片的适应对策。结果表明:上、下角质层厚度与叶片结构紧密度在两种生境中无显著差异,除叶片结构疏松度外,荒漠湿地中的胡杨叶片各解剖结构厚度及面积等特征显著大于绿洲河岸林;0~30 cm土壤全氮含量对荒漠湿地与绿洲河岸林的胡杨叶片解剖结构特征具有显著影响,而0~30 cm土壤全钾含量对两种生境中的胡杨叶片解剖结构发育均无显著影响;荒漠湿地中的胡杨叶片各结构变异系数及多数结构的可塑性指数均大于绿洲河岸林,其中主脉木质部面积的变异系数和可塑性指数在两种生境中均较大。与生境中物种丰富度更高的额济纳绿洲河岸林相比,敦煌西湖荒漠湿地的胡杨以更大的叶片解剖结构厚度或面积等特征来适应更加恶劣的生境。叶片解剖结构的可塑性是胡杨适应荒漠区脆弱生态系统的重要方式和策略。
The study of Populus euphratica in desert-wetland in Dunhuang and oasis-riparian forest in Ejina,Inner Mongolia of northern China was carried out by the quantitative analysis of the anatomical structure.We compared the adaptation strategies of Populus euphratica in two habitats and the results showed that：there was no significant difference in the thickness of the upper and lower stratum corneum and the compactness of the leaf structure in the two habitats. In addition to the leaf structure porosity,the thickness and area of the anatomical structures of the Populus euphratica leaves in desert-wetland were significantly larger than those in oasis-riparian forest. 0-30 cm soil total nitrogen content had a significant effect on the anatomical structure of Populus euphratica in both desert-wetland and oasisriparian forest,and 0-30 cm soil total potassium had no significant effect on the leaf anatomical structure of Populus euphratica in the two habitats. The coefficient of variation of the structure and the plasticity index of the majority of the leaves in desert-wetland were larger than those of the oasis-riparian forest,and the coefficient of variation and plasticity index of the xylem area of the main veins were larger in both habitats. Compared with oasis-riparian forest,Populus euphratica in desert-wetland is adapted to the dryer habitat with larger leaf anatomical thickness or area. The plasticity of leaf anatomical structure is an important way and strategy for Populus euphratica to adapt to vulnerable ecosystems in desert areas.
出处
《北京林业大学学报》
CAS
CSCD
北大核心
2017年第10期53-61,共9页
Journal of Beijing Forestry University
基金
科技部基础工作专项(2012FY111700)
国家自然科学基金项目(31570610
31070553)
关键词
胡杨
叶片
解剖结构
可塑性
土壤全氮
Populus euphratica
leaf
anatomical structure
plasticity
soil total nitrogen
