中国西北C-3植物的碳同位素组成与年降雨量关系初探  

RELATIONS BETWEEN δ^(13) C VALUES of C-3 PLANTS IN NORTHWESTERN CHINA AND ANNUAL PRECIPITATION

作　　者：王国安[1] 韩家懋[1] 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质科学》2001年第4期494-499,共6页Chinese Journal of Geology(Scientia Geologica Sinica)

基　　金：国家自然科学基金项目 (编号 :40 0 72 0 5 9);国家自然科学基金重大项目 (编号 :498941 74)资助

摘　　要：本文对不同年降雨量环境下生长的藜、独行菜、魁蓟和平车前这 4种常见C 3植物的δ13 C进行了分析 ,发现这 4种C 3植物的δ13 C组成都表现出随年降雨量减少而变重的趋势 ,其中藜和独行菜的碳同位素组成对降水变化的响应相对要较其它 2种植物强烈得多。藜、独行菜和魁蓟的δ13 C组成与年降雨量有显著的线性关系 ,平车前碳同位素组成与年降雨量没有显著的相关性 ,表明藜、独行菜和魁蓟的δ13 C组成可作为年降雨量的替代性指标 ,平车前的δ13 C组成不能作为年降水的替代性指标。There is a tendency for precipitation in China that annual precipitation amount gradually decreases from the southeast to the northwest, and there is a obvious precipitation gradient zone in the middle latitude area in east Asia. Four C-3 plant species — Chenpodium album, Lepidium apetalum, Cirsium leo and Plantago depressa along the gradient zone were sampled, and their δ 13 C values were measured. δ 13 C values of all four plant species decrease with increasing the mean annual precipitation, and the responses of carbon isotopic compositions of Chenpodium album and Lepidium apetalum to precipitation change are much more intensive than that of Cirsium leo and Plantago depressa. Highly significant relations between carbon isotopic compositions of Chenpodium album , Lepidium apetalum and Cirsium leo , but Plantago depressa, and the mean annual precipitation are observed. These results suggest that δ 13 C values of Chenpodium album, Lepidium apetalum and Cirsium leo, but Plantago depressa, can be used as annual precipitation proxies, and that Chenpodium album , Lepidium apetalum may be more suitable than Cirsium leo.

关 键 词：C-3植物 碳同位素组成 年降雨量 藜 独行菜 魅蓟 平车前 

分 类 号：Q948.112.3[生物学—植物学]