| 天气与气候 |
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| Response of Tree-Ring Width of Pinus tabulaeformis to Climate Factors in Luoshan Mountains of Ningxia |
| WANG Ya-jun1,2, MA Yu-zhen1, ZHENG Ying-hua1, LU Rui-jie1, SANG Yan-li1, MENG Hong-wei3 |
| 1.Key Laboratory of Environmental Changes and Natural Disaster under the Ministry of Education of China in Beijing Normal University; China Center of Desert Research of Beijing Normal University, Beijing 100875, China; 2.The Resource College of Hebei University of Engineering, Handan 056038, Hebei, China; 3.College of Earth and Environmental Science, Lanzhou University, Laznhou 730000, China |
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Abstract Tree-ring cores are sampled at lower and upper forest border of pure forests of Pinus tabulaeformis in Luoshan Mountains of Ningxia. The authors develop the tree-ring width index standard chronologies and analyze the statistical characters of two sites chronologies. After anglicizing the response relationship between tree-ring width and precipitation, temperature and moisture index (P/T), it is found out that the standard chronologies of two sites are all significantly related to March, May, spring and the annual precipitation and July temperature. There is a significant relation between the tree-ring width and the prior September precipitation, autumn precipitation and summer temperature at lower forest border. Based on the size of the correlation coefficient and the number of significant factors, it is pointed out that the tree-ring width index standard chronology at lower forest border is relatively sensitive to the precipitation and temperature than that at upper forest border. Furthermore the tree-ring width trends are all positively correlative with the humid index, and the correlation coefficient between the tree-ring width standard chronology at upper forest border and March to August moisture index reaches 99% level. The standard chronology at upper forest border is relatively sensitive to the combination of water and heat.
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Received: 27 September 2008
Published: 07 September 2009
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2009, Vol. 29 
