| 天气与气候 |
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| Spatial-temporal Changes of Available Precipitation for 50 Years in Ningxia and Its Effect on Environment |
CHEN Yu-ying1,2, CHEN Nan1, WAND Shi-gong2, CHEN Xiao-guang1, MU Jian-hua1
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| 1.Key Laboratory of Preventing and Reducing Meteorological Disaster of Ningxia, Yinchuan 750002, China; 2.College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China |
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Abstract Each variable component of water resources in Ningxia was calculated based on the precipitation and temperature data from 1955 to 2006, which combined with the NDVI data from 1982 to 2002 the effect of water resources variation on eco-environment was analyzed. The spatial-temporal distribution of each variable component of water resources in Ningxia was much asymmetric; it was the largest in summer and the smallest in winter, and the more abundant in south than that in north. In recent 52 years, precipitation and available precipitation in Ningxia showed a downtrend, and the evaporation showed an uptrend; each variable component experienced four variational stages on the whole. The saltation characteristic of available precipitation was most remarkable in autumn and the saltation year is in 1978, after the saltation the available precipitation reduced evidently especially in the middle arid area. Each variable component has remarkable changing periods of 16a, 8a and 4a. In recent 20 years, the vegetation coverage rate was improved, and more analysis showed that the variation of NDVI value in Ningxia closely related with natural environment and water resources.
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Received: 22 May 2007
Published: 20 July 2008
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2008, Vol. 28 
