植物生态学报

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羊草根茎储藏功能对克隆分株出现、存活和生长的影响

李兵飒1,2,马望2,白龙3,王正文2   

  1. 1. 沈阳农业大学
    2. 中国科学院沈阳应用生态研究所
    3. 沈阳农业大学园艺学院草业科学系
  • 收稿日期:2024-08-12 修回日期:2024-11-14 发布日期:2025-01-20
  • 通讯作者: 王正文

The Effects of rhizome storage on the emergence, survival and establishment of new clonal ramets in Leymus chinensis

Bing-Sa LI1,1,wang ma2, Zhengwen Wang   

  • Received:2024-08-12 Revised:2024-11-14
  • Contact: Zhengwen Wang

摘要: 在自然界中,植物生长所需的非资源和资源环境条件在时间和空间上的分布都是异质性的,且这种异质性存在普遍性。克隆植物进化出了克隆整合、克隆形态可塑性等各种策略来应对环境异质性,其中物质储藏功能尚未受到应有关注。本研究以包含1个具芽根茎节的不同初始长度(0.5 cm、1 cm、2 cm、3 cm、4 cm和5 cm)的根茎片段为材料,埋置于营养钵土壤中并观察根茎芽的萌生及其生成的克隆分株的出土和生长情况。结果表明,随着初始根茎长度增加,根茎芽萌生率、出土率和成苗率以及所生成的克隆分株的重量均呈增加趋势,但只有初始长度为4 cm和5 cm的根茎形成的克隆分株能够存活至自养状态。这些结果表明,物质储藏功能是克隆植物应对外界环境变化和干扰的重要策略,对于其生长和繁殖具有重要意义,同时在草地恢复和生产实践中也具有潜在应用前景。

关键词: 根茎长度, 根茎芽, 萌生率, 出土率, 成苗率

Abstract: Aims In nature, the non-resource and resource environment conditions essential for plant growth are heterogeneously distributed, and such heterogeneity is ubiquitous. Clonal plants have evolved various strategies such as physiological integration and clonal morphological plasticity to deal with environmental heterogeneity, but the role of the resource storage capacity has been scarcely studied. Methods Here, we buried rhizome fragments of different lengths (0.5, 1, 2, 3, 4 and 5 cm), each containing one bud-bearing node, in pots filled with local soil, and recorded the sprouting status of the rhizomatous buds and the emergence and growth of the bud-forming clonal ramets. Important findings The bud sprouting rate and the emergence, establishment, weight of newly produced clonal ramets increased with increasing length of the initial rhizome fragments, but only those clonal ramets forming on the rhizome fragments of 4 and 5 cm long could establish (i.e., grow to a self-sustaining state). These results suggest that storage of resources is an important strategy for clonal plants to deal with environmental changes and disturbances, and thus is of great significance for their growth and propagation. Additionally, our findings are potentially useful for restoring degraded grassland and for promoting grassland production and sustainability.

Key words: rhizome length, rhizome buds, bud sprouting rate, emergence rate, establishment rate