| 生物土壤与生态 |
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| Characteristics of Surface Albedo and Soil Heat Conductivity in Sparse Vegetation Site |
| WANG Sheng; ZHANG Qiang; ZHANG Hong |
| 1.Lanzhou Arid Meteorology Institute of China Meteorological Administration; Key(Open) Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province(China Meteorological Administration), Lanzhou 730020, China; 2.Gansu Provingce Weather Modification office, Lanzhou 730020, China |
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Abstract In this paper, the two parameters that are close related to surface energy balance: surface albedo and soil heat conductivity are analyzed based on the data observed on clear day of year 2002 at the station in sparse vegetation site in Dunhuang. Being different from the former research results in gobi or desert regions the diurnal variation of surface albedo in sparse vegetation site shows remarkable asymmetry; calculated by two different methods the mean albedo on typical clear day is about 0.25. The value is close to that on gobi in Dunhuang but larger than that in \!HEIFE\" experiment, which in some respects reflects that the sparse region is a sensitive climate region. The soil heat conductivity of dry soil on clear day is 0.164~0.24 W\5m-1\5K-1 and the mean is 0.20 W\5m-1\5K-1, which is close to the value in gobi of Dunhuang, but only about an half of the value in ‘HEIFE’ and smaller than that in dry desert from some authoritative references.
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Received: 18 May 2007
Published: 20 January 2008
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2008, Vol. 28 
