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油蒿光系统II光化学参数在生长季早期对降雪事件的响应

任才 贾昕 吴雅娟 马景永 田赟 查天山

任才, 贾昕, 吴雅娟, 马景永, 田赟, 查天山. 油蒿光系统II光化学参数在生长季早期对降雪事件的响应[J]. 北京林业大学学报, 2019, 41(12): 119-127. doi: 10.12171/j.1000-1522.20190058
引用本文: 任才, 贾昕, 吴雅娟, 马景永, 田赟, 查天山. 油蒿光系统II光化学参数在生长季早期对降雪事件的响应[J]. 北京林业大学学报, 2019, 41(12): 119-127. doi: 10.12171/j.1000-1522.20190058
Ren Cai, Jia Xin, Wu Yajuan, Ma Jingyong, Tian Yun, Zha Tianshan. Responses of PSII photochemical parameter to a snowfall event in early growing season in Artemisia ordosica[J]. Journal of Beijing Forestry University, 2019, 41(12): 119-127. doi: 10.12171/j.1000-1522.20190058
Citation: Ren Cai, Jia Xin, Wu Yajuan, Ma Jingyong, Tian Yun, Zha Tianshan. Responses of PSII photochemical parameter to a snowfall event in early growing season in Artemisia ordosica[J]. Journal of Beijing Forestry University, 2019, 41(12): 119-127. doi: 10.12171/j.1000-1522.20190058

油蒿光系统II光化学参数在生长季早期对降雪事件的响应

doi: 10.12171/j.1000-1522.20190058
基金项目: 国家自然科学基金项目(31670710、31670708),国家重点研发项目(2016YFC0500905),中央高校基本科研业务费专项(2015ZCQ-SB-02)
详细信息
    作者简介:

    任才,博士生。主要研究方向:光合生理生态学。Email:cairenbjfu@foxmail.com 地址:100083 北京市海淀区清华东路35号北京林业大学水土保持学院

    责任作者:

    查天山,教授,博士生导师。主要研究方向:生态系统过程、植物对气候变化的响应等。Email:tianshanzha@bjfu.edu.cn 地址:同上

  • 中图分类号: S717.19+3

Responses of PSII photochemical parameter to a snowfall event in early growing season in Artemisia ordosica

  • 摘要: 目的研究生长季早期降雪事件对于典型沙生灌木光合生理状态的影响,以及胁迫发生后植物适应胁迫的光合生理机制。方法在降雪前后,使用多通道连续监测荧光仪,通过原位连续监测当地建群种油蒿的叶绿素荧光参数和能量分配参数的变化,确定胁迫恢复期,并分析恢复期各参数与环境因子的关系。结果实际光化学量子效率(ΦPSII)在降雪当天达到最低值,且ΦPSII的日间均值比降雪前后分别下降了约40%和33%。调节性能量耗散(ΦNPQ)和非光化学淬灭(NPQ)均在降雪当天达到最高值,其中降雪当天ΦNPQ的日间均值比降雪前后分别升高了95%和48%,NPQ分别升高了94%和76%。降雪当天的最大光化学量子效率(Fv/Fm)降到了最低(0.69),比降雪前降低了约12%,并且低于了0.73的胁迫线。Fv/Fm经过3 d恢复到了降雪前的水平。在恢复过程中油蒿伴随着光照900 μmol/(m2·s)和温度10 ℃的阈值拥有不同的响应关系,可能是在阈值前后拥有不同的环境主导因子。土壤水分始终是油蒿恢复过程中的限制性因素。结论本次降雪对于油蒿产生了胁迫,胁迫的原因主要是由于融雪产生的低温和高光强的协同作用导致的。油蒿通过动态调节自身光系统II反应中心的能量分配机制,增大调节性热能耗散比重来适应低温胁迫。油蒿从一次胁迫中恢复约需3 ~ 4 d,低光照、较高温度和较高水分有利于植物恢复过程。

     

  • 图  1  降雪前后环境因子的动态变化

                     PAR是光合有效辐射。PAR is photosynthetically active radiation.

    Figure  1.  Dynamics of environmental factors during the snow event

    图  2  降雪前后叶绿素荧光参数的动态变化

    ΦPSIIΦNPQΦNO分别表示实际光化学量子效率、调节性能量耗散和非调节性能量耗散。NPQ为非光化学淬灭。下同。ΦPSII, ΦNPQ and ΦNO are actual photosynthetic quantum yield, regulatory energy dissipation, and non-regulatory energy dissipation, respectively. NPQ is non-photochemical quenching. Same as below.

    Figure  2.  Dynamics of chlorophyll fluorescence parameters before and after the snow event

    图  3  降雪前后叶绿素荧光参数的日动态

    Figure  3.  Diurnal dynamics of chlorophyll fluorescence before and after the snow event

    图  4  降雪前后的最大光化学量子效率

    Figure  4.  Maximal quantum yield of PSII photochemistry before and after the snow event

    图  5  降雪后叶绿素荧光参数与光合有效辐射的关系

    虚线处表示光合有效辐射为900 μmol/(m2·s)。The dotted line represents photosynthetically active radiation is 900 μmol/(m2·s).

    Figure  5.  Relationship between chlorophyll fluorescence parameters and photosynthetically active radiation (PAR) after the snowfall event

    图  6  降雪后叶绿素荧光参数与空气温度的关系

    Figure  6.  Relationship between chlorophyll fluorescence parameters and air temperature (Ta) after the snowfall event

    图  7  降雪后叶绿素荧光参数与10 cm土壤含水量的关系

    Figure  7.  Relationship between chlorophyll fluorescence parameters and soil water content at 10 cm depth (SWC10) after the snowfall event

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出版历程
  • 收稿日期:  2019-01-24
  • 修回日期:  2019-02-25
  • 网络出版日期:  2019-10-09
  • 刊出日期:  2019-12-01

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