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JOURNAL OF DESERT RESEARCH  2009, Vol. 29 Issue (1): 101-107    DOI:
生物土壤与生态     
Ecological Adaptability of Photosynthesis and Water Metabolism for Tamarix Ramosissima and Nitraria Sphaerocarpa in Desert-Oasis Ecotone

LIU Bing, ZHAO Wen-zhi

Linze Inland River Basin Research Station & Laboratory of Basin Hydrology and Ecology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
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Abstract  

The photosynthesis and water metabolism of Tamarix ramosissima were studied in comparison with Nitraria sphaerocarpa at desert-oasis ecotone. Results are as follows: ①Responding to the environments, the net photosynthetic rate (Pn) exhibited so-called “photosynthetic descent” phenomenon and its curve was accorded with Gauss model. ②The respective maximum values of the net photosynthetic rate were 20.2 and 23.8 μmol CO2·m-2·s-1. The light compensation and saturation points of Pn were 244.62 and 1 180.31, 73.67 and 1 467.85 μmol·m-2·s-1, and the CO2 compensation and saturation points were 27.3 and 670.34, 65.89 and 643.5 μmol CO2·mol-1, respectively. Moreover, the optimum temperature were 35.79 and 35.75 ℃, and the optimum humidity were 17.05% and 14.60%, respectively. ③The curves of the net photosynthetic rates were both approximately accorded with double-peak parabola, whereas the light use efficiency (LUE) presented a unimodal curve. The curves of the transpiration rate (E) and water use efficiency(WUE) were unimodal banner shape for Tamarix ramosissima and wave shape for Nitraria sphaerocarpa. ④Employing relatively high Pn, E and WUE for Nitraria sphaerocarpa and high LUE for Tamarix ramosissima, they adapted themselves to desert ecological environment. Therefore, the “photosynthetic descent” phenomenon induced by light restraint was exactly the photoprotection mechanism for Tamarix ramosissima and Nitraria sphaerocarpa in the possess of coping with water intimidation, which reflected the ecological adaptability of the desert plants in the course of cooperative evolution with the environment, and the lower WUE was the adaptability mechanism of the desert plants prevalent in response to the environment.

Key words:  desert-oasis ecotone      desert plant      photosynthesis      water metabolism      ecological adaptability     
Received:  05 April 2008      Published:  20 January 2009
ZTFLH:  Q945  
Articles by authors
LIU Bing
ZHAO Wen-zhi

Cite this article: 

LIU Bing;ZHAO Wen-zhi. Ecological Adaptability of Photosynthesis and Water Metabolism for Tamarix Ramosissima and Nitraria Sphaerocarpa in Desert-Oasis Ecotone. JOURNAL OF DESERT RESEARCH, 2009, 29(1): 101-107.

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http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2009/V29/I1/101

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