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《Earth Science Frontiers》 2006-01
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An experimental study of day and night trends of soil temperature and moisture in the shallow unsaturated zone

ZENG Yi-jian, WAN Li , WANG Xu-sheng, CAO Wen-bing Beijing Key Laboratory of Water Resources and Environment Engineering, China University of Geosciences , Beijing100083,China  
In desertification areas of northwest China, the water content in the unsaturated zone originates from atmospheric precipitation and from water condensation. Condensation water plays an important role in sustaining the vegetation and eco-environment in the desertification areas. The development of condensation water may be influenced by day and night trends of temperature and moisture in the vadose zone. An experiment was conducted in a sand-filled bunker at a field site. The variable moisture content of the soil was measured in situ, rather than sample measurement using indoor specimen-weighing method, in order to avoid uncertainties and disturbances caused by traditional methods. The temperature profile across a depth of 0 to 30 cm was recorded hourly. The temperature gradient plays an important role in the transport of vapor in the unsaturated zone. The increase or decrease in moisture contents in buried soil depends on increasing or decreasing temperature gradients. Based on the analytical solution of heat conduction equation, an equation of temperature wave of the type of Fourier series was derived to predict the response of temperature at variable depths to ground surface condition. The micro-meteorological factors in the air and matrix suction in the soil were observed and reported.
【Fund】: 国家自然科学基金资助项目(90302003)
【CateGory Index】: S152
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