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许爱祝,秦惠珍,唐健民,梁惠,罗亚静,邓振海,柴胜丰.光照强度对贵州地宝兰光合特性的影响[J].广西科学院学报,2022,38(2):163-171. [点击复制]
- XU Aizhu,QIN Huizhen,TANG Jianmin,LIANG Hui,LUO Yajing,DENG Zhenhai,CHAI Shengfeng.Effects of Light Intensity on Photosynthetic Characteristics of Geodorum eulophioides[J].Journal of Guangxi Academy of Sciences,2022,38(2):163-171. [点击复制]
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| 光照强度对贵州地宝兰光合特性的影响 |
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许爱祝1,2, 秦惠珍2, 唐健民2, 梁惠2, 罗亚静3, 邓振海3, 柴胜丰2
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| (1.桂林理工大学旅游与风景园林学院, 广西桂林 541006;2.广西壮族自治区中国科学院广西植物研究所, 广西桂林 541006;3.广西雅长兰科植物国家级自然保护区管理中心, 广西百色 533209) |
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| 摘要: |
| 为探讨极危植物贵州地宝兰(Geodorum eulophioides)对光照强度的适应性，以贵州地宝兰成年盆栽植株为材料，通过人工遮阴的方法设置不同光照强度处理(8%、20%、45%和100%自然光照)，测定不同光照强度下贵州地宝兰的气体交换参数日变化、光合-光响应曲线、叶绿素荧光参数，并对其叶片叶绿素含量及生长指标进行测定。结果表明：(1) 20%、45%和100%光照强度下贵州地宝兰的日均净光合速率(Pn)呈“双峰”型曲线，有明显的“午休”现象，而8%光照强度下的Pn呈“单峰”型曲线，20%光照强度下的日均Pn值最高，为(1.922±0.453) μmol·m-2·s-1；(2)贵州地宝兰叶片的最大净光合速率(Pmax)、光饱和点(LSP)、表观量子效率(AQY)在20%光照强度下最高,在此光照强度下的光合能力最强；(3)叶绿素荧光参数Fm、Fv、Fv/Fm和Fv/F0在100%光照强度处理下显著低于其他3个处理，100%光照强度下贵州地宝兰遭受了严重的光抑制；(4)叶片叶绿素a (Chl a)、叶绿素b (Chl b)、类胡萝卜素(Car)含量和叶绿素(a+b)[Chl (a+b)]含量均随着光照强度的增大而逐渐降低，而Car/Chl (a+b)呈相反趋势；(5) 20%光照强度下贵州地宝兰的株高、基径、最大叶长和最大叶宽均最大，8%光照强度下次之，100%光照强度下最低。研究表明，贵州地宝兰对不同光环境有一定程度的适应性，20%光照强度最适宜其生长；在迁地保护中，可选择相对开阔且具有一定遮阴效果的环境进行苗木种植；在种群恢复过程中，可适当间伐上层乔灌木，增加林下透光率，提高贵州地宝兰的生长速度，促进其自然更新。 |
| 关键词: 贵州地宝兰|极危植物|光照强度|光合特性|生长 |
| DOI：10.13657/j.cnki.gxkxyxb.20220622.008 |
| 投稿时间：2022-02-11 |
| 基金项目:中央财政林业草原项目，广西林业科技推广示范项目(桂林科字[2021]第28号)和中央引导地方专项科技创新基地建设类项目(桂科ZY21195035)资助。 |
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| Effects of Light Intensity on Photosynthetic Characteristics of Geodorum eulophioides |
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XU Aizhu1,2, QIN Huizhen2, TANG Jianmin2, LIANG Hui2, LUO Yajing3, DENG Zhenhai3, CHAI Shengfeng2
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| (1.College of Tourism and Landscape Architecture, Guilin University of Technology, Guilin, Guangxi, 541006, China;2.Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin, Guangxi, 541006, China;3.Guangxi Yachang Orchid National Nature Reserve Management Center, Baise, Guangxi, 533209, China) |
| Abstract: |
| In order to explore the adaptability of an extremely endangered plant Geodorum eulophioides to light intensity,the potted adult plants of G.eulophioides were used as materials,different light intensity treatments (8%,20%,45% and 100% natural light intensity) were set by artificial shading method. The diurnal variation of gas exchange parameters,photosynthetic light response curve and chlorophyll fluorescence parameters of G.eulophioides under different light intensities were measured,and the chlorophyll content and growth indexes of plants were also measured. The results showed that:(1) Under 20%,45% and 100% light intensity,the Pn of G.eulophioides showed a 'double peak' curve with an obvious 'siesta' phenomenon,while the Pn showed a 'single peak' curve under 8% light intensity. Under 20% light intensity,the daily average Pn value was the highest,which was (1.922±0.453) μmol·m-2·s-1.(2)The maximum net photosynthetic rate (Pmax),light saturation point (LSP) and apparent quantum efficiency (AQY) of G.eulophioides leaves were the highest under 20% light intensity,and the photosynthetic capacity was the strongest under this light intensity. (3) Chlorophyll fluorescence parameters Fm,Fv,Fv/Fm and Fv/F0 under 100% light intensity treatment were significantly lower than the other three treatments. G.eulophioides suffered severe photoinhibition under 100% light intensity. (4) The contents of chlorophyll a (Chl a),chlorophyll b (Chl b),carotenoid (Car) and chlorophyll (a+b)[Chl (a+b)] contents decreased gradually with the increase of light intensity,while Car/Chl (a+b) showed the opposite trend. (5) Under 20% light intensity,plant height,base diameter,maximum leaf length and maximum leaf width of G.eulophioides were the highest,followed by 8% light intensity,and the lowest under 100% light intensity. Studies showed that G.eulophioides had a certain degree of adaptability to different light environments,and it was most suitable to grow under 20% light intensity. In ex situ conservation,it can choose a relatively open environment with certain shading effect for seedling planting. In the process of population restoration,trees and shrubs in the upper layer can be thinned appropriately to increase the light transmittance under the forest,improve the growth rate of G.eulophioides and promote its natural regeneration. |
| Key words: Geodorum eulophioides|extremely endangered plants|light intensity|photosynthetic characteristics|growth |
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