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Dynamics of willow tree (Salix matsudana) water use and its response to environmental factors in the semi-arid Hailiutu River catchment,Northwest China |
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| Authors: | Lihe Yin Yangxiao Zhou Jinting Huang Jochen Wenninger Guangcai Hou Eryong Zhang Xiaoyong Wang Jiaqiu Dong Jun Zhang Stefan Uhlenbrook |
| Institution: | 1. Xi’an Center of Geological Survey, China Geological Survey, No. 438, Youyidong Road, Xi’an, 710054, China 2. UNSCO-IHE Institute of Water Education, P.O. Box 3015, 2601 DA, Delft, The Netherlands 3. Key Laboratory of Groundwater and Ecology in Arid and Semiarid Zones of China Geological Survey, No. 438, Youyidong Road, Xi’an, 710054, China 4. Department of Water Resources, Delft University of Technology, P.O. Box 5048, 2600 GA, Delft, The Netherlands 5. China Geological Survey, No. 45, Fuwai Street, Beijing, 100037, China |
| Abstract: | Sap flow (SF)of a willow tree, meteorological variables, soil water content, and water table depth were measured during the growing period from mid-April to October, 2011 in the semi-arid Hailiutu River catchment, Northwest China. The measurements of SF showed diurnal fluctuations in sunny days and seasonal changes from 1.65 l/h in mid-April to 33 l/h in July. At hourly scale, SF is significantly correlated with net radiation, followed by air temperature, relative humidity, and wind speed. At daily scale, air temperature affects the dynamics of SF significantly. Daily SF correlates positively with net radiation and negatively with relative humidity. There is no correlation observed between daily SF and wind speed. The measurements of SF do not indicate water stress although the experimental period is dry. Correlation analysis shows that SF is strongly correlated with soil moisture and water table depth, indicating the willow tree uses both soil water and groundwater for transpiration. |
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