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2种树龄巴山榧对光照的响应

高岚 乐佳兴 张文 吴焦焦 田秋玲 刘芸

高岚, 乐佳兴, 张文, 吴焦焦, 田秋玲, 刘芸. 2种树龄巴山榧对光照的响应[J]. 北京林业大学学报, 2018, 40(10): 34-42. doi: 10.13332/j.1000-1522.20180208
引用本文: 高岚, 乐佳兴, 张文, 吴焦焦, 田秋玲, 刘芸. 2种树龄巴山榧对光照的响应[J]. 北京林业大学学报, 2018, 40(10): 34-42. doi: 10.13332/j.1000-1522.20180208
Gao Lan, Yue Jiaxing, Zhang Wen, Wu Jiaojiao, Tian Qiuling, Liu Yun. Response to light intensity of Torreya fargesii in two kinds of tree age[J]. Journal of Beijing Forestry University, 2018, 40(10): 34-42. doi: 10.13332/j.1000-1522.20180208
Citation: Gao Lan, Yue Jiaxing, Zhang Wen, Wu Jiaojiao, Tian Qiuling, Liu Yun. Response to light intensity of Torreya fargesii in two kinds of tree age[J]. Journal of Beijing Forestry University, 2018, 40(10): 34-42. doi: 10.13332/j.1000-1522.20180208

2种树龄巴山榧对光照的响应

doi: 10.13332/j.1000-1522.20180208
基金项目: 

重庆市林业重点科技攻关项目 渝林科研2016-7

国家自然科学基金项目 31370602

详细信息
    作者简介:

    高岚。主要研究方向:植物生理生态。Email:gaolan199614@163.com 地址:400715 重庆市北碚区天生路2号西南大学资源环境学院林学系

    责任作者:

    刘芸,博士,教授。主要研究方向:植物生理生态。Email:utrecht@swu.edu.cn 地址:同上

  • 中图分类号: S718.43; S791.53;Q945.79

Response to light intensity of Torreya fargesii in two kinds of tree age

  • 摘要: 目的通过对2种树龄的巴山榧光合作用特性的研究,初步探讨光照条件对不同树龄巴山榧的影响,为深入揭示巴山榧濒危机制提供科学依据。方法本研究选址重庆市南川金佛山周家石窖次生林地,随机选取样地中生长良好的3年生和15年生巴山榧各3株,做好标记并测定其光合参数日变化、光响应曲线、CO2响应曲线以及叶绿素含量。结果15年生巴山榧的叶绿素a、叶绿素b、类胡萝卜素含量均大于3年生巴山榧,其中叶绿素a和b的差异显著;3年生巴山榧的叶绿素a/b大于15年生巴山榧,差异不显著。15年生巴山榧净光合速率(Pn)、蒸腾速率(Tr)日均值显著大于3年生日均值;胞间CO2浓度(Ci)日均值显著低于3年生日均值。15年生巴山榧光饱和时最大净光合速率(Pnmax)大于3年生;表观量子效率(AQY)、暗呼吸收速率(Rd)、光补偿点(LCP)小于3年生,光饱和点(LSP)大于3年生;3年生巴山榧CO2饱和时Pnmax、羧化效率(CE)、光呼吸速率(Rp)、CO2补偿点(CCP)、CO2饱和点(CSP)小于15年生。结论3年生巴山榧光合系统结构完整,已具备较好的光合能力,在温度高、光照强的环境中,能及时启动“午休现象”以此来保护光合机构免于被破坏;但其不适应强光照射,在光合作用过程中能通过提高光呼吸速率以及对弱光较强的利用能力,以保持较高的光能转化效率。15年生巴山榧则对光照、CO2利用幅度较宽,尤其在强光照射下,能及时启动“午休现象”,增大蒸腾速率来使叶片免于灼伤;在弱光环境中还能通过降低暗呼吸作用的消耗以积累更多的有机物质,表现出对周围环境变化更强的适应性。

     

  • 图  1  不同树龄巴山榧的株高

    Figure  1.  Plant height of T. fargesii in two different tree ages

    图  2  2种树龄巴山榧环境因子日变化

    Figure  2.  Diurnal variations of environmental factors of T. fargesii in two different ages

    图  3  2种树龄巴山榧光合参数的日变化

    Figure  3.  Diurnal variations in photosynthetic parameters of T. fargesii in two different tree ages

    图  4  2种树龄巴山榧Pn-PAR响应曲线的拟合

    Figure  4.  Simulation of Pn-PAR response curves of Torreya fargesii in two different tree ages

    图  5  2种树龄巴山榧Pn-CO2响应曲线的拟合

    Figure  5.  Simulation of Pn-CO2 response curves of T. fargesii in two different tree ages

    表  1  2种树龄巴山榧叶绿素含量

    Table  1.   Chlorophyll content of Torreya fargesii in two different ages

    树种
    Species
    叶绿素a
    Chl a/(mg·g-1)
    叶绿素b
    Chl b/(mg·g-1)
    叶绿素a/b
    Chl a/Chl b
    类胡萝卜素
    Carotenoid/(mg·g-1)
    15年生巴山榧15-year-old Torreya fargesii 3.36±0.15a 1.21±0.08a 2.80±0.12a 1.68±0.03a
    3年生巴山榧3-year-old Torreya fargesii 2.66±0.05b 0.89±0.1b 2.98±0.13a 1.25±0.03a
    注:不同字母表示同一列差异显著(P<0.05)。Note: Different letters indicate significant differences in same column at P < 0.05 level.
    下载: 导出CSV

    表  2  2种树龄巴山榧的光合作用相关参数

    Table  2.   Relevant photosynthetic parameters of T. fargesii in two different tree ages

    树种
    Species
    Pnmax/
    (μmol·m-2·s-1)
    AQY/
    (mol·mol-1)
    Rd/
    (μmol·m-2·s-1)
    LCP/
    (μmol·m-2·s-1)
    LSP/
    (μmol·m-2·s-1)
    R2
    15年生巴山榧
    15-year-old Torreya fargesii
    18.07a 0.104b 2.15a 21.52b 194.12a 0.999
    3年生巴山榧
    3-year-old Torreya fargesii
    15.62a 0.138a 2.36a 33.62a 181.24a 0.997
    下载: 导出CSV

    表  3  2种树龄巴山榧的CO2响应曲线相关参数

    Table  3.   Relevant parameters of CO2 response curves s of T. fargesii in two different tree age

    树种
    Species
    Pnmax/
    (μmol·m-2·s-1)
    CE/
    (mol·ml-2·s-1)
    RP/
    (μmol·m-2·s-1)
    CCP/
    (μmol·mol-1)
    CSP/
    (μmol·mol-1)
    R2
    15年生巴山榧
    15-year-old Torreya fargesii
    45.11a 0.106a 8.53a 85.99a 1353.02a 0.996
    3年生巴山榧
    3-year-old Torreya fargesii
    34.53b 0.103a 8.03a 84.81a 1148.65b 0.972
    下载: 导出CSV
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