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    宁宇, 董树斌, 张志翔, 崔丽娟, 赵良成. 扁秆荆三棱球茎萌苗种群的大小级及生长速率研究[J]. 北京林业大学学报, 2015, 37(2): 107-112. DOI: 10.13332/j.cnki.jbfu.2015.02.013
    引用本文: 宁宇, 董树斌, 张志翔, 崔丽娟, 赵良成. 扁秆荆三棱球茎萌苗种群的大小级及生长速率研究[J]. 北京林业大学学报, 2015, 37(2): 107-112. DOI: 10.13332/j.cnki.jbfu.2015.02.013
    NING Yu, DONG Shu-bin, ZHANG Zhi-xiang, CUI Li-juan, ZHAO Liang-cheng. Growth rate dynamics and size variation of Bolboschoenus planiculmis population from tuber sprouting[J]. Journal of Beijing Forestry University, 2015, 37(2): 107-112. DOI: 10.13332/j.cnki.jbfu.2015.02.013
    Citation: NING Yu, DONG Shu-bin, ZHANG Zhi-xiang, CUI Li-juan, ZHAO Liang-cheng. Growth rate dynamics and size variation of Bolboschoenus planiculmis population from tuber sprouting[J]. Journal of Beijing Forestry University, 2015, 37(2): 107-112. DOI: 10.13332/j.cnki.jbfu.2015.02.013

    扁秆荆三棱球茎萌苗种群的大小级及生长速率研究

    Growth rate dynamics and size variation of Bolboschoenus planiculmis population from tuber sprouting

    • 摘要: 产生不同大小的后代通常被视为对环境风险的一种两面下注策略,而研究也发现克隆植物远端构件可能具有生长优势。为了研究不同球茎类型和水分条件是否对球茎萌苗形成的分株种群的大小级产生影响,以及远端分株在生长速率上是否也存在优势,本文以扁秆荆三棱为对象开展了研究。设计了基于球茎类型(原生、次生和新生)和水分条件(湿润无积水、1~2 cm薄积水、10 cm水深)的区组实验,通过监测其分株高度和数目变化来进行比较。结果显示:1) 球茎类型和水分条件对扁秆荆三棱分株种群的大小有显著影响,但对克隆之间大小的变异没有显著影响;2) 随着水深的增加,分株数和高度都呈增加趋势,新生球茎萌苗形成的分株高度较低,但分株数在球茎类型间无显著差异;3) 分株生长速率只和克隆生长阶段有关,随着分株数增加,克隆和分株的生长速率都呈增大趋势,但是远端分株的生长速率并没有显著优势。因此,克隆植物大小级独立于环境条件的稳定性可以视作对资源的有效利用以及对环境风险进行缓冲的策略,而克隆规模对生长速率的促进可能是由于生理整合作用而导致的。远端分株生长速率无明显优势则说明远端分株可能更偏向于储藏和向克隆外探索。

       

      Abstract: The production of variable sized offspring is considered as the optimal solution to the trade-off between size and number and a bet-hedging strategy to environmental risks. It has been suggested that distal modules in clonal plants tend to have superiority in growth. In order to understand whether tuber types and water conditions affect size variation of ramet population, and whether the growth of distal modules is faster than proximal ones, we conducted an experiment with Bolboschoenus planiculmis, in which there were three types of tubers (primary, secondary and new) and three water conditions (wet, 1-2 cm and 10 cm depth of flooding) in a random block design. The height and number of ramets were recorded and GLM model was used to test the effects. Results are shown as follows. 1) Tuber type and water condition had significant effects on the height and number of B. planiculmis ramet population, but not on size variation. 2) Increase in water depth improved the ramet height and the total number of ramets. Ramet height of new tubers was significantly smaller, but no significant difference was observed in ramet number. 3) Ramet growth rate was positively correlated with growth phase, and the growth rate of clones and ramets tended to increase with the increase of ramet number.Nevertheless, distal ramets did not show a significantly higher growth rate than proximal ramets. Therefore, the independence of size variation to external environmental factors may interpret that clonal plants use resources efficiently and it is their strategy to mitigate environmental risks. Physiological integration may play an important role in promoting growth rate of clones by clone size. The fact that there were no advantages in growth rate of distal ramets illustrates that that distal ramets prefer to be the resource sink and the explorer of open area.

       

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