摘要
【目的】树木年轮作为一种代用的气候资料有着重要的科学意义,探讨了柳杉年轮宽度指数与气候要素之间的关系,为气候变化是如何影响树木的生长过程研究提供一定的依据。【方法】以川西南40a柳杉为研究对象,采用ARIMA模型拟合柳杉(Cryptomeria fortune)的径向生长,同时建立川西南地区柳杉年轮宽度指数年表,利用多重对应分析(MCA)柳杉径向生长与气候要素之间的关系。【结果】柳杉年轮宽度指数的变化趋势与温度的变化趋势呈现"分离现象",与降水量的变化趋势一致;柳杉年轮宽度指数与当年生长季4、8月份温度呈显著相关关系(P<0.05),柳杉年轮宽度指数与上个生长季的降水量呈正相关关系,与当年生长季7月份降水量呈显著正相关(P<0.05),与上个生长季10月份及当年生长季6月份累计日照时间呈显著负相关关系(P<0.05);当年生长季6-8月份适宜的温度有利于年轮宽度的增加,当年生长季5-9月份的温度和降水量达到一定的指标时不利于年轮宽度的增加。【结论】温度、降水总量与柳杉年轮宽度指数总体关系密切,生长季6-8月份的温度、5-9月的降水总量对柳杉径向生长影响明显。
【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.
出处
《四川农业大学学报》
CSCD
北大核心
2012年第3期293-299,共7页
Journal of Sichuan Agricultural University
基金
四川省教育厅项目(11ZA290
11ZA291)
关键词
柳杉
年轮宽度指数
气候变化
多重对应分析
Cryptomeria fortune
tree-ring width index
climate change
multiple correspondenceanalysis
