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Journal of Arid Land

Abstract

Based on the analysis of the correlation between the tree-ring width of Pinus tabulaeformis and the climate factors in the western Hedong sandy land of Ningxia, a conversion equation between the annual precipitation and the tree-ring width since 1899 was reconstructed. The results of cross veri-fication indicated that the conversion equation is stable and the reconstructed results are reliable. The result of reconstructed annual precipitation showed the remarkable fluctuation of precipitation and dry-to-wet variation before the 1940s. The smaller fluctuation and high frequent changes of precipita-tion occurred during the period of 1940s1980s and after the 1980s the change trend of the precipi-tation became high periodic extent and low frequent. The study found that there were some coinci-dences with the climate change in Changling Mountains, Helan Mountains and the east of Qilian Mountains. The relatively dry periods in the beginning of 20th century, 1920s to 1930s, the end of the 20th century and 2004 to 2006 in the western Hedong sandy land of Ningxia accelerated the deserti-fication, while the relatively humid period during the periods of the 1910s1920s, 1930s1940s and 1990s is favorable to prevent and control the desertification, and to weaken the climate warming and drying. The periods of annual precipitation variation in the western Hedong sandy land of Ningxia since 1899 are approximately 24 years, 57 years and 10 years.

Keywords

Hedong sandy land of Ningxia; tree-ring width; annual precipitation; correlation

First Page

286

Last Page

294

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