中国北方C_3植物碳同位素组成与年均温度关系  

The annual average temperature in northern China

作　　者：王国安[1] 韩家懋[2] 周力平[1] 

机构地区：[1]北京大学城市与环境学系,北京100871 [2]中国科学院地质与地球物理研究所,北京100029

出　　处：《中国地质》2002年第1期55-57,共3页Geology in China

基　　金：国家自然科学基金项目(40072059);国家自然科学基金重大项目(49894174)联合资助。

摘　　要：本文对不同温度条件下生长的藜、独行菜、魁蓟和平车前4种常见C3植物的δ13C进行了分析,结果发现这4种C3植物的δ13C组成都表现出随年均温度下降而变重的趋势,其中藜和独行菜的碳同位素组成对温度变化的响应相对要较其他两种植物强烈得多,同时还发现藜、独行菜和魁蓟的δ13C组成与年均温度有显著线性相关,平车前碳同位素组成与年均温度没有显著的相关性。表明藜、独行菜和魁蓟的δ13C组成可作为年均温度的替代性指标,平车前的δ13C组成不能作为年均温度的替代性指标。Four common C 3 plant species—Chenpodium album,Lepidium apetalum,Cirsium leo and Plan-tago depressa—were sampled and theirδ 13 C values were measured.Theδ 13 C values of all the four plant species decrease with increasing annual average temperature,and the responses of the carbon iso topic com positions of Chenpodium album and Lepidium apetalum to temperature change are much more in tense than those of Cirsium leo and Plantago depressa.Highly significant linear re lationships between carbon iso-topic compositions of Chenpodium album,Lepidium apetalum and Cirsium leo,but Plantago depressa,with an nual tem perature are observed.These results suggest that theδ 13 C values of Chenpodium album,Lepidi -um apetalum and Cirsium leo,but Plantago depressa,can be used as annual temperature proxies,and that Chenpodium album and Lepidium apetalum may be more suitable than Cirsium leo.

关 键 词：C3植物 碳同位素组成 年均温度 中国北方 独行菜 藜 魁蓟 平车前 

分 类 号：P597.2[天文地球—地球化学]