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中国沙漠 ›› 2011, Vol. 31 ›› Issue (6): 1472-1478.

• 生物土壤与生态 • 上一篇    下一篇

胡杨和灰杨的叶绿素荧光参数及茎水势对塔克拉玛干沙漠腹地生境的响应

韩 炜1,2, 海米提·依米提3*, 李 利4, 李生宇4, 郑婷婷4   

  1. 1.新疆大学 资源与环境科学学院, 新疆 乌鲁木齐 830046; 2.新疆大学 绿洲生态教育部重点实验室, 新疆 乌鲁木齐 830046; 3.新疆师范大学, 新疆 乌鲁木齐 830054; 4.中国科学院新疆生态与地理研究所, 新疆 乌鲁木齐 830011
  • 收稿日期:2010-07-09 修回日期:2010-10-07 出版日期:2011-11-20 发布日期:2011-11-20

Characterizations of Chlorophyll Fluorescence Parameters and Stem Water Potentials of Populus euphratica and Populus pruinosa Grown in the Hinterland of Taklimakan Desert

HAN Wei1,2, Hamid Yimit3, LI Li4, LI Sheng-yu4, ZHENG Ting-ting4   

  1. 1.School of Resources and Environment Sciences, Xinjiang University, Urumqi 830046, China; 2.Ministry of Education Key Laboratory of Oasis Ecology, Xinjiang University, Urumqi 830046, China; 3.Xinjiang Normal University, Urumqi 830054, China; 4.Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
  • Received:2010-07-09 Revised:2010-10-07 Online:2011-11-20 Published:2011-11-20

摘要: 通过测定胡杨(Populus euphratica)、灰杨(Populus pruinosa)叶绿素荧光参数和茎水势,研究了二者成龄叶片样本的电子传递和光能的吸收、分配和耗散对塔克拉玛干沙漠腹地生境的适应特征。结果表明,无论清晨弱光下还是正午强光下,胡杨茎水势均比灰杨低,胡杨具有更强的吸水能力;在光合有效辐射不十分高的晴天内,胡杨的光系统Ⅱ的电子传递速率ETR对时间的积分面积大于灰杨,表明胡杨的日能量积累量大于灰杨;胡杨的非光化学淬灭系数NPQ呈单峰状,灰杨呈双峰态,正午的光合有效辐射对灰杨造成了一定程度的光抑制;午后14时(光合有效辐射最大,PAR=1216 μmo·m-2·s-1),胡杨Y(NO)∶Y(NPQ)∶Y(Ⅱ)=18%∶50%∶32%,主动耗散能量的比例占到50%,表现了极强的抗性,而灰杨3者比例为Y(NO)∶Y(NPQ)∶Y(Ⅱ)=16%∶19%∶65%,通过提高主动散热(NPQ机制)比例,胡杨较灰杨具有更强的强光适应能力。胡杨与灰杨皆可通过提高激发能热耗散比例适应较高光合有效辐射,但胡杨较灰杨具有更强的调节能力和抗性。

关键词: 热耗散, 电子传递, 能使用策略, 抗逆

Abstract: The characteristics of acclimation in photochemistry, thermal energy dissipation and electron transport in leaves of Populus euphratica and Populus pruinosa trees in the hinterland of Taklimakan Desert were studied by measuring chlorophyll-a fluorescence and stem water potentials. The stem water potentials of P. euphratica were lower than that of P. pruinosa no matter in the weak light in the morning or in the high light at noon, which indicated the bigger water absorbing of P. euphratica. The integral area of P. euphratica at daytime was bigger than that of P. pruinosa in moderate light days, which suggested the more energy accumulation of P. euphratica. PAR at noon inhibited a little to the electron transport of P. euphratica, formed double-peak curves of NPQ in P. pruinosa but single-peak curves in P. euphratica. The energy utilizing proportions of P. euphratica presented as Y(NO)∶Y(NPQ)∶Y(Ⅱ)=18%∶50%∶32%; for P. pruinosa, Y(NO)∶Y(NPQ)∶Y(Ⅱ)=16%∶19%∶65%, which showed P. euphratica had a stronger stress-tolerance. The results indicated that both P. euphratica and P. pruinosa grown in the hinterland of Taklimakan Desert could acclimate to high light intensity at noon by increasing the fractions of thermal energy dissipation, but P. euphratica had more regulating capacity than P. pruinosa.

Key words: thermal energy dissipation, photosynthetic electron transport, energy utilizing strategies, stress-tolerance

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