干旱区研究

干旱区研究 ›› 2011, Vol. 28 ›› Issue (5): 820-825.

• 植物生态与植物地理 • 上一篇    下一篇

旱生藓类植物——厚肋流苏藓（Crossidium crassinerve）

 刘永英1, 卜崇峰2,3, 孟杰2, 李敏1, 赵建成1   

    1.  河北师范大学 生命科学学院，河北 石家庄 050016
    2. 西北农林科技大学 资源与环境学院，陕西 杨凌 712100
    3. 中国科学院 水利部水土保持研究所，陕西 杨凌 712100
  • 出版日期:2011-09-15 发布日期:2011-10-16
  • 作者简介:刘永英(1969－)，女，河南淮阳人，副教授，主要从事苔藓植物学研究. E-mail: liuyongying981@sohu.com
  • 基金资助:

    国家自然科学基金资助项目（40701096）；河北省自然科学基金项目（C2010000381）

Xeromorphic Moss, Crossidium crassinerve (Pottiaceae, Musci),a Newly Recorded Species in Shaanxi Province and Its Ecological Functions

 LIU  Yong-Ying1, BU  Chong-Feng2,3, MENG  Jie2, LI  Min1, ZHAO  Jian-Cheng1   

    1. College of Life Science, Hebei Normal University, Shijiazhuang 050016, China
    2. College of Resources and Environment, Northwest A &F University, Yangling 712100, Shaanxi Province, China
    3. Institute of Soil and Water Conservation, Chinese Academy of Sciences & Ministry of Water Resources, 
      Yangling 712100, Shaanxi Province, China
  • Published:2011-09-15 Online:2011-10-16

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摘要： 首次记录了厚肋流苏藓〔Crossidium crassinerve (De Not.) Jur.〕及流苏藓属（Crossidium）在陕西省的分布，详尽描述了该种的形态结构，对叶片绿色丝体细胞、蒴齿、基膜、孢子、生殖苞、假根等重要结构进行了扫描电镜观察。从茎、叶结构、绿色丝体、群落、繁殖方式等方面分析了适应干旱环境的特征，讨论了厚肋流苏藓在固沙、保水和植被演替等方面的生态学作用。

关键词: 藓类植物, 厚肋流苏藓（Crossidium crassinerve）, 生态作用, 新纪录, 陕西

Abstract: As a xerophyte, Crossidium crassinerve (De Not.) Jur. is newly reported in Shaanxi Province based on the specimens collected from Shenmu County. The genus is recorded in Shaanxi Province for the first time. Its morphologic and anatomical characters are described and illustrated. Some important structures, such as cell of chlorophyllose filament on costae, peristome, basal membrane, spore, antheridium and relationship between rhizoid and sand fixation, are observed under a scanning electron microscopy. The species is one of the typical xerophytes growing in arid and semiarid areas. Moss forms gradually the following morphologic and anatomical features to adapt the extremely arid environment: plants dwarf and are in dense turfs or small cushions, have dense and branched rhizoids; stems have central strand and leaf costa with guide cells; stem leaves imbricate and are concave in distal half; upper part of the leaf margin is strongly recurved; costa excurrent is just like a long hyaline hair; filaments restrict the adaxial surface of costa; the species not only produces the sexual structure sporophyte, but also generates a lot of asexual structure gemmae in this area. The species is mainly distributed in desert, semiarid desert or hilly regions covered by sand sheet in the regions between 15°-50° N in the world. It plays the important ecological roles in sand fixation, water storage and vegetation succession. It is restricted in Inner Mongolia and Xinjiang of northwest China. The new record provides a reference for the flora in Shaanxi and even in China.

Key words: moss, Crossidium crassinerve, ecological role, new record, Shaanxi Province

中图分类号: 

  • Q949.352