| 天气与气候 |
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| Climate Evolvement and Response of Soil Moisture in Typical Semi-arid Region on Loess Plateau |
| WANG Xi-wen1,2, WANG Yi-rong3, ZHANG Cun-jie3 |
| 1.Lanzhou Central Meteorological Observatory, Lanzhou 730020, China; 2.Lanzhou Institute of Arid Meteorology, China Meteorological Administration; Key Laboratory of Arid Climate Change and Reducing Disaster of Gansu Province, Lanzhou 730020, China; 3.Lanzhou Regional Climate Center, Lanzhou 730020, China |
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Abstract Based on the rainfall and temperature data from 1937-2004 and soil moisture data from 1971-2004 in typical semi-arid area on Loess Plateau, we studied the rainfall and temperature changes and the response of soil moisture by applying the wavelet analysis method. Results showed that the annual rainfall and the annual temperature had decreasing trend in the nearly 70 years, but; the rainfall from March to June had increasing trend. In details, the change trend of rainfall and temperature existed difference among time stages. Precipitation before 1958 mainly showed negative anomaly, 1959-1979 was rainy period, since 1979 rainfall gradually decreased and after 1998 it again had increasing trend. The temperature before 1977 was decreasing on the whole, and gradually increased after 1977. The change of rainfall existed a shorter period of 4~6 years and a longer period of 14~16 years; the change of temperature had no remarkable period in warmer years, but had a period of 5~9 years in colder years. Soil moisture easily responded to the short-term rainfall change, the short-period oscillation of rainfall and temperature. The principal character of soil water in this region was arid. On the whole, soil moisture had a decreasing trend from 1971-2004, with a fluctuating decreasing trend in growth season and a fluctuating increasing trend in saturation season; for details, soil moisture was better in middle and late 1970s, worse in 1980s, became good since end of 1990s.
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Received: 12 July 2005
Published: 20 January 2007
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2007, Vol. 27 
