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应用生态学报 ›› 2022, Vol. 33 ›› Issue (7): 1747-1754.doi: 10.13287/j.1001-9332.202207.002

• 生物土壤结皮专栏 • 上一篇    下一篇

黄土丘陵区两种丛藓科植物展叶时长及关键影响因子

杨晓莉1,2, 赵允格2, 郭雅丽2,3, 梁银丽1,4*   

  1. 1西北农林科技大学林学院, 陕西杨凌 712100;
    2西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室, 陕西杨凌 712100;
    3西北农林科技大学资源环境学院, 陕西杨凌 712100;
    4中国科学院水利部水土保持研究所, 陕西杨凌 712100
  • 收稿日期:2021-09-27 接受日期:2022-01-26 出版日期:2022-07-15 发布日期:2023-01-15
  • 通讯作者: *E-mail: liangyl@ms.iswc.ac.cn
  • 作者简介:杨晓莉, 女, 1996年生, 硕士研究生。主要从事藓类植物生长发育研究。E-mail: 15753246558@nwafu.edu.cn
  • 基金资助:
    国家自然科学基金项目(41830758)资助。

Leaf spreading duration and its influencing factors for two Pottiaceae species in hilly Loess Plateau, Northwest China

YANG Xiao-li1,2, ZHAO Yun-ge2, GUO Ya-li2,3, LIANG Yin-li1,4*   

  1. 1College of Forestry, Northwest A&F University, Yangling 712100, Shaanxi, China;
    2State Key Laboratory of Soil Erosion and Dry-land Farming on the Loess Plateau, Institute of Soil and Water Conservation, Northwest A&F University, Yangling 712100, Shaanxi, China;
    3College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, Shaanxi, China;
    4Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling 712100, Shaanxi, China
  • Received:2021-09-27 Accepted:2022-01-26 Online:2022-07-15 Published:2023-01-15

摘要: 藓类植物是变水植物,展叶时长是影响其生长发育的关键。目前,干旱半干旱区藓类植物野外生长发育动态及其影响因子的研究鲜见报道。本研究以黄土丘陵区常见的土生对齿藓和扭口藓为对象,研究了9月5日—11月25日野外自然条件下两种藓类的展叶情况。结果表明: 9—10月,两种藓类叶片表现出有规律的“展开-闭合-展开”的日动态变化,并且土生对齿藓叶片在上午闭合时间较扭口藓平均提前0.68 h,下午叶片展开时间则推后了1.79 h。两种藓类在雨季时展叶时间较长,土生对齿藓展叶时长为251 min,较扭口藓(361 min)低30.4%。近地表大气相对湿度是影响藓株展叶时长的关键因子,藓种的形态结构也会影响展叶时长;相比于土生对齿藓,扭口藓植株较为低矮,中肋占叶片比例大,茎皮部细胞镶嵌结构更为突出,其展叶时的湿度阈值(54.3%)低于土生对齿藓(60.1%)。展叶时长主要受湿度的影响,扭口藓对环境的适应性更强。

关键词: 丛藓科, 形态结构, 展叶时长, 湿度, 藓结皮

Abstract: Mosses are poikilohydric plants. The duration of leaf spreading time is a key factor affecting their growth and development in the field. The dynamics of field growth and development and influencing factors of mosses in arid and semi-arid areas are largely unknown. In the study, we examined leaf spreading situation under natural conditions from September 5th to November 25th for Didymodon vinealis and Barbula unguiculata, two common species in hilly Loess Plateau. The results showed that the leaves of both species showed a regular diurnal dynamic change of ‘spreading-closing-spreading’ from September to October, and that the average leaf closing time of D. vinealis in the morning was 0.68 hours earlier than that of B. unguiculata, while leaf spreading time was delayed by 1.79 hours in the afternoon. Both species spread their leaves for longer time in the rainy season. The average leaf spreading duration of D. vinealis was 251 min, which was 30.4% lower than B. unguiculata of 361 min. The relative humidity near the surface was the key factor affecting leaf spreading duration. The morphological structure of moss species would affect leaf spreading duration. Compared with D. vinealis, B. unguiculata was relatively short, with a large proportion of costa in leaves, and the mosaic structure of stem cortex cells was more prominent. The humidity threshold during leaf spreading of B. unguiculata (54.3%) was lower than that of D. vinealis (60.1%). The leaf spreading duration was mainly affected by humidity. B. unguiculata was more adaptable to the environment than D. vinealis.

Key words: Pottiaceae, morphological structure, leaf spreading duration, humidity, moss crust