| 生物土壤与生态 |
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| Study of Sap Flow in Stem of Populus Euphratica in Lower Reaches of Tarim River |
| ZHOU Xiao-ming, CHEN Ya-ning, LI Wei-hong, HE Bin, HAO Xing-ming |
| Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, The key Laboratory of Oasis Ecology and Deserter Environment, Urumqi 830011, China |
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Abstract Sap flow of Populus euphratica and its relationship with environmental factors were studied based on the experimental data of sap flow and environmental factors in the lower reaches of Tarim River from May to September, 2005. Results show that the flux of sap flow differs greatly from day to night, it starts at about 7:30, then rise rapidly and reaches its peak value at about 10:30, from 10:30 to 20:00, the sap flow remained at high level with a minor fluctuation, at night the sap flow is slow. In its growing season from May to September, the sap flow is weak in May, relatively strong in June, very strong in July to September. The seasonal change of sap flow of P. euphratica, closely relates to its pentad phenomenon. There is close relationship between stem sap flow of Populus euphratica and climatic factors. The results of Pearson Correlation Analysis show that the photosynthetic active radiation (PAR) is the most important factor, which is followed by relative humidity (H), then atmosphere temperature (Ta) and then wind speed(S).
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Received: 29 April 2007
Published: 20 July 2008
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2008, Vol. 28 
