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对采自青藏高原东南部林芝地区的喜马拉雅冷杉进行交叉定年后,分析了喜马拉雅冷杉年轮δ~(13)C序列与气候要素之间的关系。去除大气CO_2浓度升高导致大气CO_2中δ~(13)C下降和生长趋势的影响后,建立树轮δ~(13)C值的残差序列△~(13)C。利用附近林芝气象站的气象资料,分析了树轮△~(13)C序列对气候要素的响应。结果表明:冷杉δ~(13)C的高频振荡与该地区前一年的9～11月降水和相对湿度存在较好的相关性,并存在强的滞后效应。通过建立回归方程重建了该区域的秋季(9～11)月相对湿度序列,解释方差达37.9％。重建相对湿度序列表明1800年前相对湿度变化周期较短、变幅较小,1800～2000年则相反。
After the cross dating of Himalayan fir collected from the Nyingchi area in southeastern Tibet Plateau, the relationship between the δ 13 C sequences and the climatic elements of the fir in the Himalayas was analyzed. After the removal of atmospheric CO 2 concentration, which led to the decrease of δ ~ (13) C and the growth trend in atmospheric CO_2, the residual sequence Δ ~ (13) C of δ ~ (13) C value was established. Using the meteorological data of Nyingchi meteorological station nearby, the response of tree ring △ ~ (13) C sequence to climatic elements was analyzed. The results show that there is a good correlation between the δ ^ (13) C high frequency oscillation and the precipitation and relative humidity from September to November in the previous year, and there is a strong hysteresis effect. The regression equation was established to reconstruct the relative humidity in autumn from September to November in this region, and the explained variance was 37.9%. The reconstructed relative humidity sequence shows that the relative humidity has a relatively short period of change 1800 years ago, with a small amplitude and the opposite from 1800 to 2000.