| 生物土壤与生态 |
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| Stem Sap Flow of Caragana korshinskii and Its Influence Factors in a Revegetated Desert Area |
| HUANG Lei1, ZHANG Zhi-shan1, ZHOU Xiao-kun2 |
| 1.Shapotou Desert Research and Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; 2.Department of Mathematics, Northeastern University, Shenyang 110004, China |
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Abstract Stem sap flows of 18-year-old Caragana korshinskii plants were monitored continuously with Dynamax stem flow recorder for the entire growing season under nature conditions in a revegetated desert area. Environmental factors such as solar radiation, air temperatures, relative humidity, wind speed, and precipitation were measured meanwhile with eddy correlation system. Results show that the curves of stem sap flow rate in the whole growing season are obviously single-peak. Sap flow usually starts at 00:00 and increases gradually, reaches peak point at about 08:30—11:30, then gradually decreases to the minimum point at the middle night. Sap flow rate is significantly correlated with solar radiation, vapour pressure deficit, relative humidity, air temperature and wind speed, among which the solar radiation and relative humidity are two main factors that affect the sap flow rate of Caragana korshinskii. The close correlation between daily sap flow rate and meteorological factors in the whole growing season provides us an accurate estimation of the transpiration of Caragana korshinskii and rational water carrying capacity of sand dunes in the revegetated desert areas. Lastly, multiple linear equation of sap flow rate and environmental factors is established through stepwise regression.
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Received: 26 July 2010
Published: 20 March 2011
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2011, Vol. 31 
