| 生物土壤与生态 |
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| 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.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 |
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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.
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Received: 09 July 2010
Published: 20 November 2011
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Cite this article:
HAN Wei;Hamid Yimit;LI Li;LI Sheng-yu;ZHENG Ting-ting. Characterizations of Chlorophyll Fluorescence Parameters and Stem Water Potentials of Populus euphratica and Populus pruinosa Grown in the Hinterland of Taklimakan Desert. JOURNAL OF DESERT RESEARCH, 2011, 31(6): 1472-1478.
URL:
http://www.desert.ac.cn/EN/ OR http://www.desert.ac.cn/EN/Y2011/V31/I6/1472
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