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| Soil Moisture Characteristics and Analysis on Its Moving Mechanism in Central Gansu, a Part of the Semi-arid Loess Plateau |
| Li Deshuai1,2, Wang Jinyan1, Wang Shigong1, Li Zhenchao3, Shang Kezheng1, Bi Jianrong1 |
1. Key laboratory of Semi-Arid Climate Change and Reducing Disaster of Ministry of Education/College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;
2. Unit 94032 of PLA, Wuwei 733000, Gansu, China;
3. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract With the data collected at the Semi-Arid Climate Observatory and Laboratory of Lanzhou University (SACOL) in the whole year of 2010, we analyzed the annual and diurnal variations of soil moisture in Central Gansu, a part of the semi-arid Loess Plateau. The transport mechanism of soil moisture was explored by calculating water vapor flux and evaporation, too. The results showed that the seasonal changes of soil moisture were strongly influenced by precipitation, and the seasonal average data showed that the characteristics of surface and underlying layer was more obvious than that of middle layer. The highest value of soil moisture was found at about 10 cm under the surface. In the days without precipitation, the soil humidity changed in a waveform as it gradually reduced at night and rose gradually in the daytime. That change was in good agreement with soil water vapor flux and the direction of vapor flux was controlled by temperature gradient. In the daytime, water vapor flew to deeper soil and to air from the surface where the temperature was relatively high, and it flew to the surface with a lower temperature from deeper soil at night. So the evaporation of deeper soil occurred mainly at night, and it appeared in soil pores within 40 cm below the surface. In the day, the actual evaporation mainly came out in soil pores within 0-5 cm below the surface while the evaporation was very weak under 5 cm. Results of this study may have some certain reference value for improving the semi-arid area land surface model, and making the local ecological environment more beautiful.
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Received: 10 December 2012
Published: 20 January 2014
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Corresponding Authors:
王式功，wangsg@lzu.edu.cn
E-mail: wangsg@lzu.edu.cn
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2014, Vol. 34 
