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利用天山中部北坡头屯河及三屯河流域4个天山云杉采点的树轮样本,研制样条函数不同步长的树轮宽度标准化年表,分析样条函数不同步长对树轮宽度标准化年表与气候的相关性的影响发现:①随着样条函数步长的增加,位于森林中下部林缘的庙尔沟煤矿和三屯河的树轮宽度标准化年表与小渠子气象站上年7月至当年6月的降水量的相关系数曲线均呈现出先增后减小的变化形式,但在局部有差异,最佳步长分别为40a和30a。②随着样条函数步长的增加,处于森林上限的东南沟和小渠子的树轮宽度标准化年表与大西沟气象站当年2—3月的月平均气温的相关系数的曲线都呈现光滑的先升后平的对数曲线型,最终确定220a、185a分别作为东南沟和小渠子树轮宽度标准化年表的样条函数步长。③通过分析发现最佳的样条函数步长比传统方法给定的样条函数步长和按树轮宽度序列公共区间长度的1/2的样条函数步长所含的气候信息多。
Based on the tree-ring samples collected from 4 Tianshan spruce trees in Toutun River and the northern part of Tiantang River basin on the northern slope of Tianshan Mountains, the tree-ring width standardization chronology with different spline functions was developed. The results of the correlation between width-normalized chronology and climate show that: (1) With the increase of spline function steps, the tree-ring width standardization chronology of the Miaolugou coal mine and the Situn River, The correlation coefficient curves of precipitation from July last year to June of last year of the weather station all showed the first increase and then the decrease, but there were differences in the local, the best step was 40a and 30a respectively. (2) As the spline function step increases, the curve of the correlation coefficient between the tree-ring width standardization chronology of the southeast channel and the small canal in the forest upper limit and the monthly mean temperature of February to March of the Daxigou weather station are all smooth Of the first logarithmic curve of the first increase after the flat, and ultimately determine 220a, 185a, respectively, as the southeast channel and small canal tree wheel width standardization chronology spline step. (3) It is found through analysis that the best spline function step contains more climatological information than the spline function step given by the traditional method and the spline function step length of 1/2 of the common section length of the tree wheel width sequence.