树轮δ^(13)C趋势地区差异的初步研究  

Preliminary Study on the Relationship between Trends of Tree-ring δ^(13)C Series and Site Conditions

作　　者：陈拓[1] 秦大河[1] 李江风 刘晓宏[1] 任贾文[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冰芯与寒区环境实验室,甘肃兰州730000 [2]新疆气象科研所,新疆乌鲁木齐830002

出　　处：《兰州大学学报（自然科学版）》2001年第6期107-111,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：中国科学院知识创新工程 (KZCX1- 10 - 0 2 ) ;中国科学院冰芯与寒区环境开放实验室知识创新工程项目 (2 10 5 0 6 );中国科学院阜康荒漠生态野外观测站基金联合资助项目

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 .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.

关 键 词：树轮 碳同位素组成 林冠效应 地区差异 序列趋势 树木年轮 古环境气候学 

分 类 号：P532[天文地球—古生物学与地层学] P461.7[天文地球—地质学]