| 天气与气候 |
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| Establishment of Tree-ring Chronology and its Response to Climate Factors in Nanmulin Region, Southern Tibetan Plateau |
| LIU Jing-jing, YANG Bao |
| Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract The Tibetan Plateau, located in subtropical latitudes and having a very special topography, is very sensitive to climate changes. In this study, a new tree-ring chronology of Tibetan juniper (Sabina tibetica) spanning the period of 1375—2008, was established in the Rikaze region on southern Tibetan Plateau. Correlation and response analysis was applied for relation between ring-width index and climate factors. Results showed that positive correlation was found between the tree-ring width and the monthly temperature preceding growth seasons, whereas negative correlation was found between the tree-ring width and the summer temperature of the current year. There was a correlation coefficient of 0.66 (P<0.01) between annual precipitation (prior July to current June) and the ring-width index, indicating that annual precipitation could be the controlling factor for tree growth on southern Tibetan Plateau. The tree-ring chronology in Nanmulin region can be regarded as an indicator of annual precipitation and can reflect the wet-dry fluctuations over the period of 1560—2008 A.D. Abrupt changes around 1627 and 1829 were detected using the methods of Mann-Kendall and moving t-test at multi-decadal scale. Power spectrum analysis revealed significant cycles of 150 a, 100 a, 75 a, 60 a, 50 a, 3.7 a and 3.06 a over the past 499 years.
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Received: 18 April 2011
Published: 20 November 2011
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2011, Vol. 31 
