生物学杂志

生物学杂志 ›› 2022, Vol. 39 ›› Issue (1): 69-.doi: 10. 3969/ j. issn. 2095-1736. 2022. 01. 069

• 研究报告 • 上一篇    下一篇

不同生境密蒙花光合生理特性及光合曲线最适模型

  

  1. 1. 西华师范大学 生命科学学院, 南充637000; 2. 西华师范大学 环境科学与工程学院, 南充637000
  • 出版日期:2022-02-18 发布日期:2022-02-15
  • 通讯作者: 肖娟,博士,副教授,研究方向为植物学,E-mail: xiaojuanhj@163.com
  • 作者简介:陈兰英,硕士,助教,研究方向为植物生态学,E-mail: yunxiangshangqiqi@126.com
  • 基金资助:
    国家青年科学基金项目(31700387);西华师范大学基本科研业务费(18D049)

Effects of different habitats on photosynthetic characteristics and the optimal model of light response curves of Buddleja officinalis Maxim.

  1. 1. College of Life Science; 2. College of Environmental Science and Engineering,China West Normal University, Nanchong 637000, China
  • Online:2022-02-18 Published:2022-02-15

PDF (PC)

28

摘要：

以川东北丘陵地区林内(生境Ⅰ)、林窗(生境Ⅱ)和林缘(生境Ⅲ)下的密蒙花(Buddleja officinalis Maxim.)为研究对象,测定其盛花期株高、基径、花序长、叶面积、黄酮类化合物含量和叶片叶绿素含量、光响应曲线及光合日变化,分析密蒙花对不同生境的适应性,运用5 个常用模型对3 个生境下的密蒙花光响应曲线进行拟合对比,探讨适合用于拟合密蒙花光响应曲线的模型。研究结果表明:3 个生境中林窗的株高、基径、花序长和叶面积均显

著高于林内和林缘生境林窗(P<0. 05),黄酮类化合物含量林窗显著高于林内和林缘,林内最低(P<0. 05);叶绿素a、叶绿素b 和总叶绿素含量林窗显著高于林内和林缘,林内最低(P<0. 05);光合日进程中,林内和林窗生境的净光合速率呈“单峰”曲线,林缘呈“双峰”曲线;5 个模型中直角双曲线修正模型为密蒙花光响应曲线最适拟合模型,在盛花期内,密蒙花林内、林窗和林缘饱和光强分别为1 424. 70、1 725. 76 和1 608. 85 μmol/ (m2·s),最大净光合速率分别为14. 07、17. 54 和16. 30 μmol/ (m2·s),光补偿点分别为26. 59、19. 08 和20. 89 μmol/ (m2·s),符合半阴性至半阳性植物的特点。林窗生境中的密蒙花光补偿点低,光饱和点高,对光适应的生态幅较宽。因此,密蒙花适宜种植在林窗生境下,如在林内生境中种植需及时调控乔冠层的透光率,在林缘中种植需要进行适度遮荫处理。


关键词: 密蒙花, 叶绿素含量, 光响应曲线, 光合日变化

Abstract:

To reveal the photosynthetic physiological characteristics and select the best fitting model to analyze the photosynthetic-light response curve of Buddleja officinalis Maxim. in different habitats, the plant high, basal diameter, leaf area, inflorescence ength,flavonoids,photosynthetic characteristics (using a portable photosynthesis system LI-6400 to measure photosynthetic light response curves and diurnal variations of photosynthesis) and chlorophyll contents in canopy gap, forest edge and forest understory were measured and compared. The results showed that the plant high, basal diameter, leaf area, inflorescence length and flavonoids were the highest in the canopy gap (P<0. 05). The chlorophyll-a, chlorophyll-b, and total chlorophyll contents were the highest in the canopy gap, and the lowest in the understory (P<0. 05). The diurnal variation of the net photosynthesis rates in the leaves of B. officinalis in the canopy gap and understory showed one-peak curve, whereas at the forest edge it showed a double-peak curve with remarkable midday depression. The modified rectangular hyperbola model was the best fitting model for the light response curve of B. officinalis, and the light saturation intensity in three different habitats were 1 424. 70, 1 725. 76, and 1 608. 85 μmol/ (m2·s), respectively; the maximum net photosynthetic rates were 14. 07, 17. 54, and 16. 30 μmol/ (m2·s), respectively; and the light compensation points were 26. 59, 19.08 and 20. 89 μmol/ (m2·s), respectively; which were consistent with the characteristics of semi-negative to semi-positive plants. The lower light compensation point and higher light saturation point occurred in the canopy gap, indicating that B. officinalis in canopy gaphad wider ecological amplitude to light than that other habitats. B. officinalis had the characteristics of combining shade plant and heliophyte,and the canopy gap habitat might be helpful to accumulation of organic materials and more suitable for the growth. Planting in the understory habitat needs to improve canopy light penetration in time, then at the forest edge, the appropriate shading is required.

Key words: Buddleja officinalis Maxim. , chlorophyll content, light response curve, diurnal variation of photosynthesis

中图分类号: