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林业科学 ›› 2013, Vol. 49 ›› Issue (10): 7-16.doi: 10.11707/j.1001-7488.20131002

• 论文与研究报告 • 上一篇    下一篇

色木槭与辽东栎幼苗对森林光环境的形态及生理响应

王芳, 刘宁, 姚延梼   

  1. 山西农业大学林学院 太谷 030801
  • 收稿日期:2013-05-02 修回日期:2013-08-26 出版日期:2013-10-25 发布日期:2013-11-05
  • 通讯作者: 刘宁
  • 基金资助:

    林业公益性行业科研专项经费项目(201304326);山西农业大学科技创新基金项目(201310)。

Morphological and Physiological Responses of Acer mono and Quercus liaotungensis Seedlings to a Forest Light Gradient

Wang Fang, Liu Ning, Yao Yantao   

  1. College of Forestry, Shanxi Agricultural University Taigu 030801
  • Received:2013-05-02 Revised:2013-08-26 Online:2013-10-25 Published:2013-11-05

摘要:

以萌发后2周的色木槭和辽东栎2种幼苗为试验材料,在森林光环境下根据实际测量值设置4个相对透光率水平:100%,51%,22%和12.8%,观测1个生长季后2种幼苗的存活率、光合能力、光合色素含量、高生长、根系形态以及生物量积累和分配等指标,从而了解2种幼苗在第1个生长季中的存活、生长表现及对不同光环境响应的差异。结果表明: 萌发后,色木槭和辽东栎幼苗的整体存活情况相近,但色木槭的最大光合效率、光饱和点及光合色素含量低于辽东栎,苗高、总根长、侧根长和根表面积以及各器官生物量积累等绝对生长量高于辽东栎,且将生物量更多地分配到叶,与之相比,辽东栎幼苗的根生物量分配比重较大; 遮荫处理后,在22%和12.8%的相对透光率下,色木槭的存活率下降,辽东栎的存活率增加,且在12.8%的相对透光率下2种幼苗的存活率无显著差异; 遮荫处理导致色木槭幼苗的光补偿点和暗呼吸速率显著下降,叶绿素含量增加,光合生理响应大于辽东栎,根系形态响应以及生物量积累和分配的变化响应显著,但小于辽东栎。

关键词: 色木槭, 辽东栎, 光响应, 光适应, 幼苗, 存活和生长策略

Abstract:

To investigate the acclimation of Mono Maple (Acer mono) and East-liaoning Oak (Quercus liaotungensis) seedlings under the forest light gradient and the relationship of the acclimation to seedling banks in the oak forests, two-week-old seedlings of these two species were assigned to four various radiance levels: 100%, 51%, 22%,and 12.8% of natural light in the forest environment. We measured their survival, photosynthesis, photosynthetic pigment content, growth, root morphology and biomass accumulation and allocation after one growing season to provide evidences for dynamics of understory seedling bank and succession of temperate oak forests. The results showed that the survival of Mono Maple and East-liaoning Oak seedlings was similar after germination. However, Mono Mample seedlings had smaller maximum photosynthetic capacity, light saturation point and pigment content than that of East-liaoning Oak seedlings, but higher seedling height, total root length, secondary root length, root surface area and biomass accumulations of all organs.Mono Maple seedlings invested more biomass to foliage while East-liaoning Oak seedlings invested more biomass to underground. At 22% and 12.8% relative transmittance levels, survival of Mono Maple seedlings decreased significantly compared with those growing under 100% transmittance level. Under the lower radiation regimes, survival of East-liaoning Oak seedlings increased. However, there was similar survival of two seedlings under 12.8% transmittance condition. When growing under shades, mono maple seedlings lowered light compensation point and dark respiration rate and increased chlorophyll contents significantly, and they had relatively greater physiological responses and but relatively smaller morphological responses, such as biomass accumulation and allocation, than East-liaoning Oak seedlings.

Key words: Acer mono, Quercus liaotungensis, light response, light acclimation, seedlings, survival and growth strategies

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