珍稀树种红花玉兰在华北地区的最适光环境

杨杨; 贾忠奎; 陈发菊; 桑子阳; 马履一

doi:10.11913/PSJ.2095-0837.2015.30377

珍稀树种红花玉兰在华北地区的最适光环境

1. 北京林业大学教育部森林培育与保护重点实验室, 北京 100083;
2. 三峡大学生物技术研究中心, 湖北宜昌 443002;
3. 五峰土家族自治县林业局, 湖北五峰 443400

详细信息

作者简介:
杨杨(1984-),男,博士,主要从事红花玉兰引种栽培生理生态学研究(E-mail:jiufengqujingren@163.com)。

通讯作者:
马履一,E-mail:maluyi@bjfu.edu.cn

中图分类号: Q945.11;S685.15
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出版历程
- 收稿日期: 2014-11-16
- 网络出版日期: 2022-10-31
- 发布日期: 2015-06-27

Optimal Light Regime for the Rare Species Magnolia wufengensis in Northern China

1. Ministry of Education Key Laboratory for Silviculture and Conservation, Beijing Forestry University, Beijing 100083;
2. Biotechnology Research Center, Three Gorges University, Yichang, Hubei 443002, China;
3. Forestry Bureau of Wufeng County, Wufeng, Hubei 443400, China

摘要

摘要: 珍稀树种红花玉兰对其华南原产地的自然环境有良好的适应性, 但在华北地区却生长不良。通过对红花玉兰在华北地区一个生长季内对三种光照水平(100%、70%、40%全光照)的光合和生长响应分析, 结果表明:在70%全光照条件下, 红花玉兰幼苗的净光合速率、光饱和点、株高、基径、根生物量和茎生物量均达到最高水平。随着光照强度的减弱, 暗呼吸速率、光补偿点、比叶重量、叶片厚度和密度显著降低, 表观量子效率、最大荧光Fm、可变荧光Fv、Fm/Fo(Fo为初始荧光)、Fv/Fo、Fv/Fm、叶绿素含量、叶面积和叶柄角度均显著增大。说明70%全光照最适于一年生红花玉兰幼苗在华北地区的生长, 全光照和40%全光照条件下幼苗则因光量的过剩和不足而生长不良。因此建议将红花玉兰栽植在林缘或林窗地带, 可为这一珍稀濒危树种在华北地区的引种提供有利的适生光照环境。
- 红花玉兰 /
- 光适应 /
- 光合作用 /
- 叶绿素荧光 /
- 生长
Abstract: The rare species Magnolia wufengensis, which is adapted to the natural conditions of its native habitat in southern China, has shown poor growth in northern regions. We analyzed the photosynthetic and growth responses of M. wufengensis grown in northern China under three light levels (100%, 70%, and 40% sunlight) during one growing season. Under 70% sunlight, plants had a maximum net photosynthetic rate (P_max), light saturation point (LSP), seedling height, basal diameter, root biomass and stem biomass. With decreasing light level, the dark respiration rate (R_d), light compensation point (LCP), specific leaf weight, leaf thickness and leaf density significantly decreased, and apparent quantum yield (AQY), maximum fluorescence (Fm), variable fluorescence (Fv), Fm/initial fluorescence (Fo), Fv/Fo, Fv/Fm, chlorophyll content, leaf area and petiole angle significantly increased. We concluded that 70% sunlight was the optimum light level for 1-year-old M. wufengensis seedlings grown in northern China. Poor growth responses were observed under full and 40% sunlight, resulting from excessive and insufficient light energy, respectively. For the successful introduction to northern China, microsites at forest edges or gaps should be favored to provide an optimal light environment for M. wufengensis.
- Magnolia wufengensis /
- Light adaptation /
- Photosynthesis /
- Chlorophyll fluorescence /
- Growth

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