中文摘要：

通过对大兴安岭北部樟子松树轮样品高向的年轮宽度和稳定碳同位素比率（δ^13C）进行测定,分析了高向上δ^13C的变化特征及其与年轮宽度的关系.结果表明：在木质部全轮、早材和树皮内皮3种成分中,样品高向δ^13C均呈现由顶部至基部先显著增加,在冠层底部达到最大值,再向下迅速减少至谷值的变化趋势.早晚材平均宽度比由基部至顶部增大.高向上δ^13C年均值序列与轮宽年均值序列呈现较为明显的反向对应关系,与早晚材宽度比年均值序列呈现在冠层以上较为一致的变化趋势.样本高向上年轮宽度序列及δ^13C序列均存在不同程度的显著差异,δ^13C值的高向变化与年际变化基本处于同一量级.树体高向δ^13C序列逐年变化趋势基本一致,同一高度盘的δ^13C序列与年轮宽度序列基本呈负相关,但不同高度的显著性有所差异.

英文摘要：

A measurement was made on the vertical direction tree ring stable carbon isotope ratio （δ^13C） and tree ring width of Pinus sylvestris var. mongolica in northern Daxing＇ an Mountains of Northeast China, with the relationship between the vertical direction variations of the tree ring δ^13C and tree ring width analyzed. In the whole ring of xylem, earlywood （EW） and bark endodermis, the δ^13C all exhibited an increasing trend from the top to the base at first, with the maximum at the bottom of tree crown, and then, decreased rapidly to the minimum downward. The EW and latewood （LW） had an increasing ratio of average tree ring width from the base to the top. The average annual sequence of the δ^13C in vertical direction had an obvious reverse correspondence with the average annual sequence of tree ring width, and had a trend comparatively in line with the average an- nual sequence of the tree ring width ratio of EW to LW above tree crown. The variance analysis showed that there existed significant differences in the sequences of tree ring δ^13C and ring width in vertical direction, and the magnitude of vertical δ^13C variability was basically the same as that of the inter-annual δ^13C variability. The year-to-year variation trend of the vertical δ^13C sequence was approximately identical. For each sample, the δ^13C sequence at the same heights was negatively correlated with the ring width sequence, but the statistical significance differed with tree height.