三江平原不同生境下小叶章茎解剖结构的比较

采用解剖学方法观察了三江平原3种不同生境(典型草甸、沼泽化草甸和沼泽)下小叶章茎的解剖结构。对厚角细胞层数、薄壁细胞层数、厚角细胞壁厚度、皮层厚度、维管束厚度和导管腔大小等6个参数进行了比较分析。结果表明,3种生境下生长的小叶章茎的结构组成基本相同,没有因生境的差异而产生某些特异性的结构,但各结构参数在数量、大小等方面均呈现出显著差异,表明小叶章对环境变化具有一定的结构适应能力。

Anatomical structure of Deyeuxia angustifolia stem in different habitats of Sanjiang Plain

This paper studied the anatomical structure of Deyeuxia angustifolia stem in the representative meadow,swamp meadow,and swamp of Sanjiang Plain.Six parameters were determined,i.e.,cell layers of collenchyma and parenchyma,cell wall thickness of collenchyma,thickness of cortex layer and vascular bundle,and diameter of vessel lumen.The results showed that in the three habitats with different water conditions,the structural components of the stem were basically the same but showed significant differences in their amount and size,indicating that Deyeuxia angustifolia had definite adaptation abilities to the changes of environment.