›› 2010, Vol. 18 ›› Issue (5): 622-628,635.DOI: 10.11733/j.issn.1007-0435.2010.05.003

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Effects of Enhanced UV-B Radiation and Temperature Variation on the Response of Photosynthesis and Related Physiological Parameters of Straw-Yellow Gentian (Gentiana straminea Maxim.) to changing in Photosynthetical Active Radiation

WU Jian-guo   

  1. Chinese research academy of environmental sciences, Beijing 100012, China
  • Received:2009-10-14 Revised:2010-09-19 Online:2010-10-15 Published:2010-10-15

UV-B辐射增强和温度变化对麻花艽光响应的影响

吴建国   

  1. 中国环境科学研究院, 北京, 100012
  • 作者简介:吴建国(1971- ),男,博士,研究员,主要从事气候变化生态影响及其适应研究,E-mail:wujg9298@yahoo.com.cn
  • 基金资助:
    中国环境科学研究院公益性院所基金项目(2007KYYW05)资助

Abstract: This study describes the effects of temperature changes and enhanced UV-B radiation on net photosynthesis and related physiological parameter of straw-yellow gentian(Gentiana straminea Maxim.).Samples were analyzed using 20 W and 40 W UV-B lamps to increase UV-B radiation and with LI-6400 portable photosynthesis systems to change air temperature.Results show that net photosynthetic rate(Pn),stomata conductance(Gs),intercellular CO2 concentration(Ci),transpiration rate(E) and water use efficiency(WUE) of straw-yellow gentian was higher under control than that under 20W or 40 W UV-B lamp treatments,while Pn at 25℃ was higher than that at 15℃ under increasing UV-B radiation treatments in August or under controls in September.Additionally,E of straw-yellow gentian at 25℃ was higher than that at 15℃,while Gs,Ci or WUE of straw-yellow gentian at 25℃ was lower than that at 15℃ under increasing UV-B radiation treatments.Results also show that Pn of straw-yellow gentian increased with increasing photosynthetic active radiation(PAR) when the PAR ranged from 0~800 μmol·m-2·s-1,while maximizing when PAR ranged from 800~2200 μmol·m-2·s-1,but no change when the PAR ranged from 2200~3000 μmol·m-2·s-1.The Gs or E of straw-yellow gentian increases with increased the PAR.The Ci of straw-yellow gentian decreases with increased PAR when the PAR ranged from 0~800 μmol·m-2·s-1,but did not change when the PAR ranged from 800~3000 μmol·m-2·s-1.The WUE of straw-yellow gentian increases with increased the PAR when the PAR ranged from 0~800 μmol·m-2·s-1,and it decreases slowly when PAR ranged from 800~3000 μmol·m-2·s-1.Results indicate that enhanced UV-B radiation results in decreased Pn,Gs,Ci,E and WUE of alpine meadows leaves that would be influenced by temperature variation.

Key words: UV-B radiation change, Photosynthesis, Alpine Meadows, Straw-Yellow Gentian, Qinghai-Tibet Plateau

摘要: 为了确定UV-B辐射增强和温度变化对高寒草甸植物生理过程的影响,以LI-6400便携式光合测定系统控制温度和紫外灯UV-B辐射增强方法,测定分析了UV-B辐射增强和温度变化对麻花艽(Gentiana straminea Maxim.)叶片光合作用及相关生理参数的影响。结果显示:麻花艽叶片净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)、蒸腾速率(E)和水分利用效率(WUE)在对照下较高,UV-B辐射为20W和40W处理下较低;8月,Pn在25℃下比15℃下显著高;9月,对照处理下Pn在25℃下比15℃下高。同时,E在25℃比15℃下高;Gs、WUE和Ci在25℃下比15℃下低。另外,麻花艽叶片Pn在光合有效辐射强度为0~800μmol·m-2·s-1时随光合有效辐射强度增加而增加幅度较大,800~2200μmol·m-2·s-1时增幅较小;Gs和E随光合有效辐射强度增加而增加;Ci在光合有效辐射强度0~800μmol·m-2·s-1时随光合有效辐射强度增加而呈现下降趋势,800~3000μmol·m-2·s-1变化不大;WUE在光合有效辐射强度0~800μmol·m-2·s-1时随光合有效辐射强度增加而呈现增加趋势,800~3000μmol·m-2·s-1时呈现下降趋势。说明UV-B辐射增强将对高寒草甸植物-麻花艽叶片光合作用及相关参数将产生极大影响,影响与温度变化有一定的关系。

关键词: UV-B辐射变化, 高寒草甸, 光合作用, 麻花艽, 青藏高原

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