Journal
ENVIRONMENTAL EARTH SCIENCES
Volume 71, Issue 12, Pages 4997-5006Publisher
SPRINGER
DOI: 10.1007/s12665-013-2891-0
Keywords
Sap flow; Willow tree; Salix matsudana; Meteorological factors; Water use
Funding
- Asia Facility for China project Partnership for education and research in water and ecosystem interactions
- Groundwater Circulation and Rational Development in the Ordos Plateau project [1212010634204]
- Groundwater monitoring in the Ordos Basin
- National Natural Sciences Foundation of China [4103752]
- Shaanxi Science and Technology Research and Development Program [2011KJXX56]
- Honor Power Foundation
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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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