Characterization of Photosynthesis of Populus euphratica Oliv and Its Microclimate Explanation in Lower Tarim River

JOURNAL OF DESERT RESEARCH

2008, Vol. 28

Issue (4): 665-672 DOI:

生物土壤与生态

Characterization of Photosynthesis of Populus euphratica Oliv and Its Microclimate Explanation in Lower Tarim River

ZHOU Hong-hua^1,2, CHEN Ya-ning^1,2, LI Wei-hong^1,2, CHEN Ya-peng^1,2

1.Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China; 2.Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China

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Abstract Net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (gs), intercellular CO₂ concentration (Ci), air CO₂ concentration (Ca), stomatal limitation (Ls), water use efficiency (WUE), photosynthetically active radiation(Par), leaf temperature(Tl), air temperature(Ta), and air relative humidity(RH) of Populus euphratica Oliv grown at different groundwater depths in the Tarim River were measured. With the increasing of groundwater depth the presenting time of the maximum Pn and Tr were advanced. The double-peak curve of Pn is more and more obvious with the increasing of groundwater depth. Tr was double-peak curve when the groundwater depths ≤4.37 m, but it was single-peak curve when the groundwater depth ≥5.91 m. With the increasing of groundwater depth, the predominant cause of restricting photosynthesis from stomatal limitation turned into non-stomatal limitation. Moderate water stress conduced to improve the water use efficiency of Populus euphratica Oliv. The study also showed: 4 m was the rational groundwater table of Populus euphratica Oliv, and when the groundwater depth was 4~5 m, it encountered mild water stress, and if the groundwater depths ≤6 m, the water stress became severe.

Key words: gas exchange groundwater depths microclimate factors Populus euphratica Oliv Tarim River

Received: 25 June 2007 Published: 20 July 2008

ZTFLH:

Q945.19



	Articles by authors
	ZHOU Hong-hua
	CHEN Ya-ning
	LI Wei-hong
	CHEN Ya-peng

Cite this article:

ZHOU Hong-hua;CHEN Ya-ning;LI Wei-hong;CHEN Ya-peng;. Characterization of Photosynthesis of Populus euphratica Oliv and Its Microclimate Explanation in Lower Tarim River. JOURNAL OF DESERT RESEARCH, 2008, 28(4): 665-672.

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http://www.desert.ac.cn/EN/ OR http://www.desert.ac.cn/EN/Y2008/V28/I4/665

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