【摘要】 比较了新疆昭苏地区、阿勒泰地区和青海祁连地区 3棵树树轮碳同位素组成的长期趋势 .研究发现 ,新疆昭苏和青海祁连序列有较为相似的趋势 ,而均与新疆阿勒泰序列有明显的不同 .分析表明 ,树轮δ13 C序列趋势之间的地区差异主要与树轮δ13 C的“林冠效应”有关 .说明在利用树轮碳同位素序列来重建大气 CO2 中的δ13 C变化历史时应选择森林郁闭度低或树冠伸出了整个林冠的树木样品 .更多还原

【Abstract】 The long-term trends of tree-ring δ 13C series, taken respectively from Qilian of Qinghai and Zhaosu and Aleitai of Xinjiang were compared. The results showed that a similar trend existed between Qilian series and Zhaosu series, while there was a significant difference between them and Aleitai series. Our analysis indicated that the site difference of the trends of tree-ring δ 13C series was mainly associated with "canopy effects" of tree growth. It is suggested that tree samples should be selected from sparse forests or the sampled tree foliage high above the whole canopy when the history of δ 13C of atmospheric CO 2 was reconstructed by tree-ring series.更多还原