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大果青杄幼苗对不同光照强度的生理响应
Physiological responses of Picea neoveitchii seedlings to different light intensities
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摘要: 以5年生大果青杄幼苗为研究对象,设置6种不同透光率处理,60d后测定生理指标并进行相关性分析和隶属函数分析,揭示不同光照强度对大果青杄幼苗生理特征的影响,分析其对光照环境的适应策略。结果表明:在不同透光率条件下,大果青杄幼苗的可溶性糖含量、可溶性蛋白含量、过氧化物酶活性、过氧化氢酶活性、超氧化物歧化酶活性和叶绿素a含量差异显著,而脯氨酸含量、丙二醛含量和叶绿素b含量差异不显著。超氧化物歧化酶活性、过氧化氢酶活性、可溶性糖含量和过氧化物酶活性之间相关性较强,表明这些生理调节是大果青杄对光照强度变化的主要响应策略。隶属函数分析显示,透光率约为63.74%时,大果青杄幼苗的生理指标表现最佳。可见,在幼苗栽培管理中采用透光率约为60%的光照环境;幼苗野外回归时,宜选择林边缘或林窗等中郁闭度生境。Abstract: To reveal the effects of different light intensities on the physiological characteristics of Picea neoveitchii seedlings and analyze their adaptive strategies to light environments, this study took 5-year-old Picea neoveitchii seedlings as the research object, set six different light transmittance treatments, and measured physiological indices after 60 days, followed by correlation analysis and membership function analysis. Under different light transmittance conditions, significant differences were observed in the contents of soluble sugar, soluble protein, Peroxide Enzyme (POD) activity, Catalase (CAT) activity, Superoxide Dismutase (SOD) activity, and chlorophyll a content in Picea neoveitchii seedlings. However, no significant differences were found in Pro Proline (Pro) content, Malondialdehyde (MDA) content, and Chlorophyll b (Chlb) content.Correlation analysis showed strong correlations among SOD activity, CAT activity, soluble sugar content, and POD activity, indicating that these physiological regulations are the main response strategies of Picea neoveitchii to changes in light intensity. Membership function analysis revealed that the physiological indices of Picea neoveitchii seedlings performed best at a light transmittance of approximately 63.74%. Therefore, in seedling cultivation and management, a light environment with a transmittance of about 60% is recommended. When returning seedlings to the wild, habitats with moderate canopy density such as forest edges or forest gaps are suitable choices.