埋藏古木的树轮碳同位素作为古气候变化代用指标的可能性  

The Possibility of Using the δ ^(13)C Sequence of α-Cellulose of the annual ring of Buried Ancient Timbers as Substituting Indices for Paleo-climate Change Research

作　　者：孙艳荣[1] 崔海亭[2] 刘鸿雁[2] 李平日[3] 谭惠忠[3] 

机构地区：[1]北京大学物理学院实验中心,北京100871 [2]北京大学环境学院,北京100871 [3]广州地理研究所,广州510070

出　　处：《地球学报》2006年第6期577-582,共6页Acta Geoscientica Sinica

基　　金：国家自然科学基金项目(编号:40071082)资助。

摘　　要：本文对广东不同时代、不同树种的埋藏古木树轮纤维素碳同位素序列研究发现:樟树和山桐子分别在相对炎热潮湿的气候环境中,其树轮δ13C值相对越偏正。结论如下:(1)古山桐子反映冰后期的冷凉气候;(2)古樟代表中全新世的潮湿热带气候;(3)古水松的大批死亡代表了晚全新世和历史时期几次寒冷事件。上述结论说明了古树树轮同位素可以作为古气候变化代用指标的可能性。通过古今对比,丰富了树轮气候学的研究内容。The tree-ring α-cellulose △δ 13C sequences of various sorts of buried ancient timber belonging to different epochs and different tree species in Guangdong Province were respectively measured. The analyses show that the δ 13C of ancient Cinnamomum camphora trees and ancient Idesia polycarpa trees which grew in a relatively warm and humid environment was more positive than the δ 13C of the trees which grew in a relatively cool and dry environment. Here are some conclusions: (1) the ancient Idesia polycarpa trees reflect the cool climate after the ice age;(2) the ancient Cinnamomum camphora trees reflect humid climate in tropical region during the mid- Holocene; and (3) the death of ancient Glyptostrobus pensilis trees in large quantities reflect several cold events during the late-Holocene and some other historic periods. These conclusions indicate the possibility of using the tree-ringδ 13C α-cellulose sequence of the buried ancient timber as the substituting index for paleo-climate change research in the tropical zone. The contrast between ancient times and modern ages has enriched the contents of dendro-climatology.

关 键 词：埋藏古木 树轮碳同位素 气候变化 

分 类 号：P5[天文地球—地质学]