川西南柳杉早材、晩材年表与温度和降雨的关系

年轮宽度和气候要素的相关或响应分析已大量应用在气候 树木生长的相互作用研究中。以川西南区瓦屋山自然保护区速生树种柳杉（Cryptomeria fortunei）的71个样芯，探讨了温度和降雨与柳杉早材、晩材年表的关系，结果表明早材径向生长对温度变化比较敏感，早材年轮指数序列与当年4月的平均温度、4月平均最高温度、上年9、10月平均最高温度间呈显著正相关关系，与当年7月平均温度以及上年11月最低温度间均存在显著负相关关系；晚材年轮序列与当年10月的平均最高温度呈显著正相关关系。柳杉早材年轮的生长过程中气温“滞后效应”表现明显，特别是在上个生长季的9～10月，最高温度的变化对柳杉当年生长季节形成较宽的年轮有重要的作用。不同的季节温度、降水量变化影响早材、晚材年轮的形成与生长

RELATIONSHIP BETWEEN RADIAL GROWTH OF EARLYWOOD, LATEWOOD OF CRYPTOMERIA FORTUNE WITH TEMPERATURE AND PRECIPITATION CHANGE IN SOUTHWEST SICHUAN PROVINCE，CHINA

Tree ring width has been widely used to investigate relationships between wood formation and environmental factors, but this proxy can be associated with high autocorrelation and it represents the integrated response to many environmental factors, which may interfere with the climatic signal. Climate growth interactions have been mostly investigated by correlation/response analysis between ring width and climatic factors. The tree ring width chronologies of Cryptomeria fortune of 71 tree cores in Wawushan Nature Reserve in the southwest Sichuan Province, according to international tree rings database standard, were developed to investigate relationships between radial growth of earlywood, latewood and temperature, precipitation. The results showed that earlywood width was more sensitive to climate than latewood width, which was insignificant with temperature．And earlywood radial growth was significantly positively correlated with average temperature of April, average maximum temperature in April, maximum temperature of September and October of the last year（ρ＝0352，p<005；ρ＝0297，p<005；ρ＝0298， p<005；ρ＝0309，p<005）, and negatively correlated with mean temperature in July and the minimum temperature in November of the last year（ρ＝-0356，p<005；ρ＝-0293， p<005）. Radial growth of latewood and mean maximum temperature in October presented significantly positive correlation（ρ＝0296， p<005）. However, radial growth of earlywood and latewood did not have significant correlation with precipitation. Radial growth of earlywood was particularly influenced on “lag effect” especially from September to October in the last year; monthly mean temperatures in April，October promote the accumulation of nutrients in plants, which is conducive to the formation of earlywood wide rings. Since lower temperature in early spring, early summer, and superabundant precipitation in growing season (especially in June and July), earlywood was easy to form narrow rings. Change of the highest temperature on growing season affected its wide ring formed. The results revealed that changes of different seasonal temperature and precipitation were acted on tree ring formation and radial growth of early wood and late wood, and precipitation is not a major limiting factor to radial growth of Cryptomeria fortune. Overall tree ring chronology of earlywood and latewood can reflect regional climate change to some extent