关键词: 柳杉, 年轮宽度指数, 气候变化, 多重对应分析

Abstract: [Objective] Dendroclirnatological approach has important significance in global climatic change and is regarded as a very good reference to climate factors. The aim of this study was to examine the relationship between tree-ring width index of Cryptomeria fortune and climatic factors. [Method] ARIMA model was employed to estimate the radial growth of C. fortune. Moreover, the tree-ring width index chronology of C. fortune in SW Sichuan was established. Multiple correspondence analysis(MCA) was used to analyze the relationship between radial growth and climates. [Results] The results showed a separation phenomenon between tree-ring width index and temperature change but tree-ring index increased with precipitation. The tree-ring width index of C. fortune was correlated significantly with the mean monthly temperature of April and August(P<0.05). Similar relationships were found in precipitation of last growing season, especially for precipitation in July(P<0.05). Nevertheless, tree-ring width index was negetively correlated with accumulative total sunshine time of current June(P<0.05) and October of last growing season(P<0.05). The temperature of current growing season(from June to August) was beneficial to increase tree-ring width. However, when the temperature and precipitation of growing season(from May to September) exceeded the threshold, they were conducive to the increase of tree-ring width. [Conclusion] Temperature, total precipitation are related closely to tree-ring width index of C. fortune. Additionaly, radial growth is significantly affected by temperature from June to August and total precipitation from May to September.

Key words: Cryptomeria fortune, tree-ring width index, climate change, multiple correspondence analysis