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林草资源研究 ›› 2025›› Issue (3): 27-37.doi: 10.13466/j.cnki.lczyyj.2025.03.004

• 科学研究 • 上一篇    下一篇

不同光照强度对桫椤幼苗生理特性的影响

李腾敏1,2(), 饶丹丹1, 陈彧1, 韩豫1, 田蜜1,2()   

  1. 1.海南省林业科学研究院(海南省红树林研究院),海口 571100
    2.海南省热带林业资源监测与应用重点实验室,海口 571100
  • 收稿日期:2025-04-14 修回日期:2025-06-11 出版日期:2025-06-28 发布日期:2026-01-07
  • 通讯作者: 田蜜,高级工程师,主要研究方向为森林培育。Email:mitian@hnaf.ac.cn
  • 作者简介:李腾敏,助理研究员,主要研究方向为森林培育。Email:hainanltm0602@163.com
  • 基金资助:
    海南省省属科研院所技术创新项目“海南热带雨林国家公园桫椤EST-SSR分子标记开发与遗传多样性研究”(KYYSLK2023-008)

Effects of different light intensities on the physiological characteristics of Alsophila spinulosa seedlings

LI Tengmin1,2(), RAO Dandan1, CHEN Yu1, HAN Yu1, TIAN Mi1,2()   

  1. 1. Hainan Academy of Forestry(Hainan Academy of Mangrove),haikou 571100,China
    2. Key Laboratory of Tropical Forestry Resources Monitoring and Application of Hainan Province,haikou 571100,China
  • Received:2025-04-14 Revised:2025-06-11 Online:2025-06-28 Published:2026-01-07

摘要: 为探究不同光照强度对桫椤幼苗生理特性的影响,设置不同遮阴梯度控制光照强度,对桫椤幼苗进行盆栽试验。经棚内自然光强(透光率约70%,CK)、60%棚内光强(T1)、30%棚内光强(T2)、10%棚内光强(T3)、2%棚内光强(T4)处理后,测定桫椤幼苗叶片生长、光合色素、抗氧化酶活性、膜稳定性及渗透调节物质,通过相关性分析和模糊综合评价法分析光照强度对桫椤幼苗的影响。结果表明:1)T1—T4处理下的地上生物量(AGB)、地下生物量(BGB)和总生物量(TB)均显著大于CK处理下的(P<0.05),根冠比(R/S)均显著小于CK处理下的(P<0.05);2)T3处理下,桫椤幼苗生长最佳,叶片数、叶长、叶宽均显著大于其他处理(P<0.05);3)T4处理下,叶绿素a(Chl a)、叶绿素b(Chl b)、总叶绿素[Chl(a+b)]均显著高于其他处理下的(P<0.05),T3处理下的类胡萝卜素(Car)最高;4)随着光照强度的降低,桫椤幼苗的部分抗氧化酶活性逐渐增强,其超氧化物歧化酶(SOD)活性在T2遮阴处理下达到最大,丙二醛(MDA)质量分数、相对电导率(EC)、可溶性糖(SS)质量分数逐渐降低,可溶性蛋白质(SP)质量分数逐渐增加;5)通过相关性和模糊综合评价,桫椤幼苗适宜在较低光照条件下生长,相对于其他光照处理,T3处理(10%棚内光强)最适合桫椤幼苗生长。该结果为国家二级重点保护野生植物桫椤的种群恢复提供了可量化的关键参数,有助于提升其保育成功率。

关键词: 桫椤, 光照强度, 光合色素, 生理指标, 幼苗

Abstract:

To investigate the effects of different light intensities on physiological characteristics of Alsophila spinulosa seedlings,a pot experiment was conducted under varying shading gradients to control light intensity.Seedlings were exposed to five treatments:Natural greenhouse light intensity(70% transmittance,CK),60% greenhouse light(T1),30% greenhouse light(T2),10% greenhouse light(T3),and 2% greenhouse light(T4).Parameters measured included leaf growth,photosynthetic pigments,antioxidant enzyme activities,membrane stability,and osmotic adjustment substances.The impacts of light intensity were analyzed using correlation analysis and fuzzy comprehensive evaluation.The results showed that:1)The aboveground biomass,underground biomass,and total biomass under T1-T4 treatments were significantly greater than those under CK treatment(P<0.05),while the root-shoot ratio(R/S)was significantly lower than that of CK treatments(P<0.05);2)Under T3 treatment,seedling growth was optimal,with leaf number,leaf length,and leaf width significantly greater than those under other treatments(P<0.05);3)Under T4 treatment,chlorophyll a(Chl a),chlorophyll b(Chl b),and total chlorophyll[Chl(a+b)]were significantly higher than those under other treatment(P<0.05),while carotenoid(Car)content was highest under the T3 treatment;4)As light intensity decreased,the activities of some antioxidant enzyme in the seedlings gradually increased,with superoxide dismutase(SOD)activity reaching its maximum under the T2 treatment;malondialdehyde(MDA)mass fraction,relative electrical conductivity(EC),and soluble sugar(SS)mass fraction gradually decreased,while soluble protein(SP)mass fraction gradually increased;5)Correlation analysis and fuzzy comprehensive evaluation indicated that A.spinulosa seedlings thrived under lower light conditions,with T3 treatment(10% greenhouse light intensity)identified as the optimal growth environment for them.These findings provide quantifiable key parameters for the population restoration of A.spinulosa,a Nationally Key Protected Wild Plant(Class II)in China-thereby enhancing its conservation success.

Key words: Alsophila spinulosa, light intensity, photosynthetic pigment, physiologic index, seedlings

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