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| Xylem Sap Flow of Populus euphratica in Relation to Environmental Factors in the Lower Reaches of Heihe River |
| Zhao Chunyan1,2, Si Jianhua1, Feng Qi1, Yu Tengfei1, Li Wei1 |
1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
2. University of Chinese Academy of Sciences, Beijing 100039, China |
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Abstract Sap flow of Populus euphratica and its relationship with environmental factors were analyzed based on the experimental data of sap flow and environmental factors in the lower reaches of Heihe River from April to October, 2012. The results showed that, the diurnal change of sap flow velocity showed minor fluctuations during the growing season. At night, the ascent of sap flow could be observed in the above main tree species owning to the existence of root pressure. In different weather condition, the sap flow velocity of P. euphratica presented that in overcast and rainy day the start time of sap flow was delayed, the stop time of sap flow was advanced, the time of sap flow was shortened and the peak significantly reduced. The seasonal variation of sap flow velocity of P. euphratica presented that the summer was sooner than spring and autumn in starting time, peak time and rapid-falling time.Transpiration of P. euphratica showed distinct seasonal patterns, April and October late water consumption is low, From May to August, and more than 70 percent occupied the average transpiration during the growing season, as the main water consumption.The sap flow velocity of P. euphratica is mainly affected by soil moisture, vapor pressure deficit, photosynthetically active radiation, relative humidity and temperature in daytime, vapor pressure deficit and relative humidity in nighttime, and photosynthetically active radiation, soil moisture, air temperature and relative humidity during the growing season. Multiple linear equation of sap flow velocity and environmental factors is established through stepwise regression.
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Received: 27 March 2013
Published: 20 May 2014
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Corresponding Authors:
司建华（Email：jianhuas@lzb.ac.cn）
E-mail: jianhuas@lzb.ac.cn
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2014, Vol. 34 
