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利用树木年轮气候学方法，根据油松直径生长与气候因子的关系，计算了过去１０９ａ（１８８６～１９９４年）秦岭北坡夏季的平均气温及降水量。夏季平均气温和降水量的平均偏差分别为０．２６℃和４０．２ｍｍ，平均偏差百分率为１．５％和１０．８％，平均相对误差分别为０．４％和７．０％，重建效果较好。同时还建立了油松年轮指数与夏季平均气温和降水量双因素气候生长模型，复相关系数为０．９２，平均相对误差为３．３％
Based on the tree-ring climatological method and the relationship between the diameter growth of Pinus tabulaeformis and climatic factors, the average summer temperatures and precipitation in the northern slope of Qinling Mountains in the past 109a (1886 ~ 1994) were calculated. The mean deviation of summer mean temperature and precipitation were 0.26 ℃ and 40.2mm, the average percentage deviation was 1.5% and 10.8% respectively, and the average relative errors were 0.4% and 7.0% respectively. Reconstruction The effect is better. At the same time, a two-factor climatic growth model of Pinus tabulaeformis growth index and summer mean temperature and precipitation was established. The complex correlation coefficient was 0.92 and the average relative error was 3.3%