<正>利用从中国天目山和庐山采集的 4株树轮样 ,分析了树轮沿不同方位δ1 3C的变化特点 ,讨论了角分布的成因。结果表明 ,树轮在不同方位上的木质α 纤维素δ1 3C值不同 ,而且各方位上δ1 3C的差异与分析期间历年平均值的年际差异在量级上大致相当。对各方位δ1 3C作方差分析表明 ,各方位存在显著性差异 ,说明δ1 3C的角分布具有独立意义。对其中一棵柳杉树轮δ1 3C角分布与气候要素的相关分析表明 ,不同方位的δ1 3C值与年、季节和月降水及温度相关 ,从而使树轮可记录信息分辨率提高、信息量增大。用树轮δ1 3C的角分布重建的气候要素更能反映气候要素的实际变化情况

Studies on circumferential δ 13 C variability in tree ring have been reported.Despite a variety of species and localities,the range of δ 13 C around the circumference of tree ring is typically 0.1%～ 0.4% .However,studies on climatic implications for the difference among radii in tree rings have not yet been reported.In this paper,four trees sampled from different localities(three from Tianmushan Mount.and one from Lushan Mount.)were analysed.More than 7 radii with forty five degree interval from each tree were analyzed.The results showed that δ 13 C differences among radii reached 0.17%,but the directions for the lowest and the highest were different for each tree.The difference among radii in δ 13 C variance to the circumferential difference was in the same order of magnitude.By analyzing the δ 13 C climate relationship,the δ 13 C differences among radii may be used to study more climatic implications.