绒毛白蜡对城市夜间光照的光合响应及其生理生化适应性特征  

Photosynthetic response and physiological and biochemical adaptability characteristics of Fraxinus velutinus to urban nighttime lighting

作　　者：吉子彧 刘艳红[1] 秦倩倩 Ji Ziyu;Liu Yanhong;Qin Qianqian(Beijing Key Laboratory of Forest Resources and Ecosystem Processes,School of Ecology and Nature Conservation,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学森林资源与生态系统过程北京市重点实验室,北京林业大学生态与自然保护学院,北京100083

出　　处：《北京林业大学学报》2025年第2期58-65,共8页Journal of Beijing Forestry University

基　　金：国家重点研发计划项目(2017YFC0504004)。

摘　　要：【目的】探讨园林绿化植物在不同强度城市夜间光照的响应特征,可以评估其对城市环境中光污染的耐受性和适应能力。研究旨在揭示绒毛白蜡对不同强度城市夜间光照的光合响应和生理生化适应性特征,进而为城市园林绿化树种选择及科学调控路灯开放时长等管理工作提供科学依据,促进城市生态环境的可持续发展。【方法】以北京市行道树常用树种绒毛白蜡为试验材料,通过野外实地监测和实验室分析,研究其叶片光合参数、光合色素含量和抗逆生理生化指标在城市夜间不同光照强度梯度下的变化和适应特征。【结果】(1)绒毛白蜡叶片的净光合速率、气孔导度和蒸腾速率可积极响应城市夜间光照,与夜间光照强度成正相关。(2)随着夜间光照强度增加,叶绿素总量显著升高,叶绿素a/b显著下降。(3)随着城市夜间光照强度增加,绒毛白蜡叶片的可溶性糖含量、超氧化物歧化酶活性、过氧化酶活性均升高,一定程度上缓解了城市夜间光照对叶片造成的胁迫。【结论】绒毛白蜡可以通过调整超氧化物歧化酶活性、过氧化酶活性、可溶性糖含量来积极的响应夜间光照,保证光合作用正常进行。绒毛白蜡表现出适应和响应夜间光照的特性,可作为城市道路绿化树种。[Objective] Exploring the response characteristics of landscape plants to different intensities of urban nighttime lighting can assess their tolerance and adaptability to light pollution in urban environments.The study aimed to reveal the photosynthetic response and physiological and biochemical adaptability of Fraxinus velutinoides to different intensities of urban nighttime lighting.This will provide a scientific basis for the selection of urban landscape tree species and scientific regulation of streetlight duration,and promote the sustainable development of urban ecological environments.[Method] Using the commonly used tree species F.velutina as the experimental material for roadside trees in Beijing,the changes and adaptation characteristics of leaf photosynthetic parameters,photosynthetic pigment content,and stress resistance physiological and biochemical indicators under different lighting intensity gradients at night in the city were studied through field monitoring and laboratory analysis.[Result](1) The net photosynthetic rate,stomatal conductance,and transpiration rate of F.velutina leaves can actively respond to urban nighttime lighting and are positively correlated with nighttime lighting intensity.(2) With the increase of nighttime lighting intensity,the total amount of chlorophyll significantly increased,while chlorophyll a/b significantly decreased.(3) With the increase of nighttime lighting intensity in urban areas,the soluble sugar content,superoxide dismutase activity,and peroxidase activity of F.velutina leaves all increased,which to some extent alleviated the stress caused by urban nighttime lighting on leaves.[Conclusion] F.velutina can actively respond to nighttime lighting by adjusting the activity of superoxide dismutase,peroxidase,and soluble sugar content,ensuring normal photosynthesis.F.velutina exhibits adaptability and response to nighttime lighting,and can be used as a tree species for urban road greening.

关 键 词：绒毛白蜡 城市夜间光照 光合节律 光合参数 抗逆 

分 类 号：S792.41[农业科学—林木遗传育种]