摘要
为分析香格里拉油麦吊云杉(Picea brachytyla)径向生长对气候变化的响应及其动态,在普达措国家公园和石卡雪山油麦吊云杉分布的海拔上限采集年轮样品,建立油麦吊云杉年轮宽度差值年表,将年轮宽度指数与不同时段温度和降水进行响应分析。结果表明:1961—2011年,当年7份月和上年10月份的月平均气温是影响香格里拉海拔上限油麦吊云杉生长的主要气候因子;1985—2011年,树木生长仅与温度变化有关,具体表现为树木生长与上年9、10月份平均气温和最低气温呈显著负相关,与当年7月份平均气温和最低气温呈显著正相关;1961—1984年,气温和降水共同影响树木生长,树木生长与当年5月份降水和当年10月份平均气温呈显著负相关。
To explore the relationship between radial growth of Picea brachytyla and climatic factors in Shangri-La and temporal dynamics,we collected tree ring cores of the species at its upper distributional limits in Potatso National Park and Shika Snow Mountain,and established residual chronologies by using tree ring width data.We further analyzed relationships between the residual chronologies and climatic factors(temperature and precipitation) in different periods by using response function analysis.The mean temperature in July of current year and October of previous year was the main factor affecting the radial growth of P.brachytyla in 1961-2011,and this phenomenon was even more pronounced after the occurrence of abrupt warming in 1984.Tree growth was only affected by temperature in 1985-2011,by showing a significant and negative correlation with the monthly mean and minimum temperature of previous September and October,but a significant and positive correlation with July monthly mean and minimum temperature of current year.From 1961 to 1984,tree growth was affected by both temperature and precipitation,showing a significant and negative correlation with current May precipitation and current October mean temperature.
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