摘要
针对新疆天山西部伊犁、博州三大山体北坡云杉上树线树木年轮资料,采用区域曲线、负指数曲线、样条函数三种不同生长去趋势方法,研制树轮宽度年表,分析不同采点和树轮去趋势方法对树轮宽度年表在不同频域的相关性及气候信号的影响发现:①采点间的距离和是否位于同一气候区是影响云杉上树线树轮宽度年表间相关性的首要因子。三个采点间的树轮宽度变化,在高频变化方面最为相似,低频变化存在着较大差异,表明它们在揭示和重建大范围的高频气候变化方面可能具有较大的应用潜力。②三种不同去趋势方法对天山西部山脉北坡上树线的云杉树轮宽度年表的研制具有一定影响,负指数和样条函数去趋势方法研制的树轮年表较为相似,而区域曲线去趋势方法研制的树轮宽度年表中则可保留较多的轮宽低频变化信息。③降水是天山西部云杉上树线的树轮宽度生长的主要限制因子,且树轮宽度生长对降水的响应具有显著的滞后性。④在天山西部的云杉上树线采点,使用区域曲线去趋势方法有利于在树轮宽度年表中保留较多的与水分有关的气候信息。
Based on the tree-ring width data of spruce from the upper tree lines on northern slope of western Tianshan Mountains in Yili and Bozhou region of Xinjiang, the tree-ring width chronologies were developed by using the three different detrending methods, i.e. regional curves, negative exponential curves （no posi- tive slope） and 300-year fixed splines. Analyses on the effect of different sampling sites and different de- trending methods on correlation between tree-ring width chronologies in different frequency domains and their climate signals showed： O Distance between two sampling sites and whether chronologies are in the same climate area are import factors that influence the correlation between two tree-ring width chronolo- gies. There are better similarity in the higher frequency domain and greater different in the lower frequency in the changes of tree-ring width at the three different sampling sites, which implies that the tree-ring width chronologies maybe possess large potential in application for disclosing and reconstructing the climate change of higher frequency domain on large scale. OThe tree ring width chronologies developed from Negative Ex- ponent and Spline Detrending methods are similar, but that developed from Regional Curve Detrending Method can remain more information of tree ring width change on lower frequency domain. （~）Precipitation is the first limiting factor that influences the tree ring width growth of spruce on upper tree line in the west- ern Tianshan Mountains and the effect has obvious hysteresis. ORegional curve detrending method can keep more moisture information in the tree ring width chronology of spruce on upper tree line in the western Tianshan Mountains of Xingjiang.
出处
《中国沙漠》
CSCD
北大核心
2008年第5期809-814,共6页
Journal of Desert Research
基金
科技部基础性工作专项(2007FY220200)
科技部气象行业专项(GYHY(QX)2007-6-8)
中国气象局项目(新疆天山北坡树木年轮气候研究
基于树轮分析与遥感技术的干旱山地森林长势监测研究)共同资助
关键词
新疆天山西部
云杉树轮宽度
不同采点
不同去趋势方法
气候信号
western Tianshan Mountains of Xinjiang
tree-ring width chronology of spruce
sampling site
detrending method
climate signal
