| Temporal and spatial characteristics of dry climate in rain-fed farming area of the Loess Plateau |
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| DOI：10.7606/j.issn.1000-7601.2011.02.38 |
| Key Words: Loess Plateau rain-fed farming area dry climate |
| Author Name | Affiliation | | FENG Yongzhong | College of Agronomy, Nortwest A & F University， Yangling, Shaanxi 712100，China
Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province， Yangling, Shaanxi 712100，China | | LIU Zhichao | Yan’an Bureau of Meteorology，Yan’an，Shaanxi 716000，China | | LIU Qiang | College of Agronomy, Nortwest A & F University， Yangling, Shaanxi 712100，China
Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province， Yangling, Shaanxi 712100，China | | CHENG Min | College of Agronomy, Nortwest A & F University， Yangling, Shaanxi 712100，China
Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province， Yangling, Shaanxi 712100，China | | YANG Gaihe | College of Agronomy, Nortwest A & F University， Yangling, Shaanxi 712100，China
Research Center for Recycling Agricultural Engineering Technology of Shaanxi Province， Yangling, Shaanxi 712100，China |
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| Abstract: |
| Studying the evolution of regional dry climate is the premise of drought resistance and disaster alleviation. To study the drought evolution trend during interannual change，seasonal variation and spatial diversity， 38 year’s meteorological data from 42 observation stations in the rainfed farming area of the Loess Plateau was used by means of a-mended palmer drought index， wavelet analysis, and EOF (empirical orthogonal function decomposition). The results showed that drought intensified during interannual change and seasonal variation which was significant after 2003. The frequency of drought period was diminished with interannual change and seasonal variation. During the four seasons， the highest effect on annual drought was found in spring which followed by summer and autumn. On the whole, the Loess Plateau tended to get increasingly drier, but there was intensity and phase differences between north and south, east and west，and the central plateau and the surrounding area. In the area north of Hengshan and Jiaxian counties, drought was
alleviating and showed normal change，while in the south region drought tended to intensified, particularly in Suide and Wubu counties . This study has certain theoretical significance and practical values for guiding the cropping system of drought resistance and disaster alleviation on the Loess Plateau. |
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