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植物研究 ›› 2022, Vol. 42 ›› Issue (3): 502-511.doi: 10.7525/j.issn.1673-5102.2022.03.020

• 生理与生态 • 上一篇    下一篇

土壤水分和光强对景东翅子树幼苗生长及光合特性的影响

张珊珊, 袁春明()   

  1. 云南省林业和草原科学院,国家林业局云南珍稀濒特森林植物保护和繁育国家林业局重点实验室/云南省森林植物培育与开发利用重点实验室,昆明 650201
  • 收稿日期:2021-04-22 出版日期:2022-05-20 发布日期:2022-05-20
  • 通讯作者: 袁春明 E-mail:1162042782@qq.com
  • 作者简介:张珊珊(1984—),女,博士,副研究员,主要从事保护生物学的研究工作。
  • 基金资助:
    国家自然科学基金项目(31960278);科技基础资源调查专项(2017FYl00100)

Effects of Soil Moisture and Light Intensity on Growth and Photosynthetic Characteristics of Pterospermum kingtungense Seedlings

Shanshan ZHANG, Chunming YUAN()   

  1. Key Laboratory of Rare and Endangered Forest Plants of National Forestry and Grassland Administration/Yunnan Key Laboratory of Silviculture and Forest Resources Development,Yunnan Academy of Forestry and Grassland,Kunming 650201
  • Received:2021-04-22 Online:2022-05-20 Published:2022-05-20
  • Contact: Chunming YUAN E-mail:1162042782@qq.com
  • About author:ZHANG Shanshan(1984—),female,doctor,mainly engaged in the research of conservation biology.
  • Supported by:
    National Natural Science Foundation of China(31960278);National Science and Technology Fundamental Resources Investigation Project(2017FY100100)

摘要:

以1年生极小种群野生植物景东翅子树(Pterospermum kingtungense)实生苗为研究对象,通过双因子室内受控试验,设置6个土壤水分梯度(100%、90%、80%、60%、40%、30%田间持水量)和4个光强梯度(100%、75%、50%、25%自然光照),研究土壤水分和光强对其幼苗生长(地上部分生物量、地下部分生物量、叶片数量和株高)及光合特性[净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、胞间二氧化碳摩尔分数(Ci)、气孔限制值(Ls)和瞬时水分利用效率(WUE)]的影响。结果表明:①随着土壤水分的减少,景东翅子树幼苗的生长及光合指标呈现先升高后降低的趋势,一般会在田间持水能力W2(32.11%)或W3(28.54%)处理下达到峰值,W6(10.70%)条件下的生长状况最差。②随着光强的降低,除了Ls外,景东翅子树幼苗的4个生长指标及5个光合特性指标均表现出先增加后减少的趋势,且均在光强为L2(75%自然光照)或L3(50%自然光照)条件下表现最佳。③不同土壤水分和不同光强的综合评价得分显示,W2土壤水分和L2光强下的综合评价得分分别最高,证明适量的土壤水分环境和适度遮荫最适于景东翅子树幼苗的生长及其光合作用。④二元线性回归分析结果表明,土壤水分和光强这2个自变量分别对景东翅子树幼苗的生长和光合指标有较强的影响。研究结果可为景东翅子树的幼苗培育及其种群恢复与重建提供理论依据。

关键词: 景东翅子树, 土壤水分, 光强, 天然更新

Abstract:

One-year-old seedlings of Pterospermum kingtungense were selected as materials, effects of soil moisture and light intensity on growth(aboveground biomass, underground biomass, leaf number and plant height) and photosynthetic characteristics(net photosynthetic rate, transpiration rate, stomatal conductance, intercellular carbon dioxide concentration, stomatal limiting value and instantaneous water use efficiency) of P. kingtungense seedlings were investigated respectively. Two-factor of controlled test was analyzed. Six soil moisture gradients(100%, 90%, 80%, 60%, 40% and 30% field capacity) and four light intensity gradients(100%, 75%, 50% and 25%full light) were designed respectively. The results showed that: ①With the decrease of soil moisture, the growth index and photosynthetic characteristics of P. kingtungense seedlings first increased and then decreased, and generally reached the peak in W2(32.11%) or W3(28.54%) treatment. It performed worst under drought stress(W6). ②With the decrease of light intensity, except stomatic limitations(Ls), the four growth indexes and other five photosynthetic characteristics of P. kingtungense seedlings showed a trend of first increasing and then decreasing, and all of them performed best under the light intensity of L2(75% full light) or L3(50% full light). ③The comprehensive evaluation scores of different soil moisture and different light intensity showed that the comprehensive evaluation score of W2 soil moisture or L2 light intensity was the highest respectively, which proved that the appropriate soil water environment and moderate shading were the most suitable for the growth and photosynthesis of P. kingtungense seedlings. ④The results of binary linear regression analysis demonstrated that soil moisture and light intensity had significant effects on the growth and photosynthesis of P. kingtungense seedlings, respectively. This study elucidates the mechanism of soil water and light on regeneration of P. kingtungense seedlings, and could provide a theoretical basis for seedling breeding and population recovery and reconstruction in the future to a certain extent.

Key words: Pterospermum kingtungense, soil moisture, light intensity, natural regeneration

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