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| An Analysis of the Adaptability of Populus euphratica and Elaeagnus angustifolia to Changes in Environmental Factors |
| Wang Zhongli, Zhao Xue, Liu Linde, Bai Xinfu, Zhu Jainjun |
| College of Life Sciences, Ludong University, Yantai 264025, Shandong, China |
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Abstract The diurnal changes in transpiration and photosynthesis in two broadleaved desert plants, Populus euphratica and Elaeagnus angustifolia were measured and analyzed in relation to the changes in the environmental factors. The results showed that:(1)the changes in diurnal patterns of transpiration and photosynthesis in P. euphratica were very similar, but the transpiration rate exhibited a lag of about 2 hours. The transpiration rate of P. euphratica was positively correlated to the temperature and water potential of the air, but did not show apparent relationship to the light intensity. P. euphratica maintained high level of transpiration and photosynthesis when both the light intensity and temperature were continuously high for several hours, no sign of regulation in water consumption was observed. The fact that the photosynthetic rate was almost linearly related to the light intensity showed that P. euphratica was a typical sun plant, since no photo-inhibition appeared to the plant. (2)In contrast, the patterns of the diurnal changes in transpiration and photosynthesis in Elaeagnus angustifolia were almost fully parallel, indicating that the photosynthesis was highly dependent on the opening of stomata and gas exchange. At high temperature and high light intensity, both the transpiration and photosynthesis in E. angustifolia declined continuously, showing that the stomata in E. angustifolia were more sensitive to changes in light intensity and temperature, and more capable of regulating the consumption of water when the water stress was severe. The transpiration and photosynthesis both showed fluctuations in the afternoon in E. angustifolia, which seemed to be due the result of stomata oscillations. (3)In terms of ecological adaptability, P. euphratica may have taken the strategy of maintaining a high level in both transpiration and photosynthesis under high temperature stress, thus have a high productivity, at the expense of high water consumption; while E. angustifolia may have taken the strategy of having asteriated scales on their leaves to reflect the excessive light to avoid radiation injury, and sensitively regulating the stomata to prevent excessive water loss. In this sense, E. angustifolia is a water-saving species among the broadleaved trees.
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Received: 25 December 2013
Published: 20 January 2015
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2015, Vol. 35 
