关键词: 罗山, 树木年轮, 响应关系

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.

Key words: Luoshan Mountains, tree-ring width, response relationship