【摘要】 在简单了解研究区的植被、气候状况的基础上 ,分析了内蒙古锡林郭勒和青海海北两种典型草地食草动物牙齿的δ1 3C值 ,测定了采样点表土有机质的δ1 3C值。锡林郭勒的表土有机质碳同位素组成略分散 ,且与植被和微环境密切相关。海北的表层土壤有机质碳同位素组成比较集中。两地的碳同位素组成都偏轻 ,是植被中C4植物含量少的反映。两地放牧动物的珐琅质δ1 3C值分别比当地植物偏重 12 .9‰和 13.5‰ ,或 14 .1‰和 14 .7‰。火灾等高温过程对动物牙齿的碳同位素组成可能没有显著影响更多还原

【Abstract】 The δ 13 C value of fossil enamel is used for studying the paleovegetation all of the world, but the relationship between the δ 13 C values of enamel and vegetations in China is undetermined. In this research, the δ 13 C values of the tooth enamel of mammals in Xilinguole and Haibei have been analyzed, and the δ 13 C values of organic matters in topsoil have also been determined, in order to illustrate the relationship between the δ 13 C values of enamel and vegetations in Northern China. We find that the δ 13 C values of organic matters in topsoil in Xilinguole and Haibei are all light. This reflects that the C4 biomass is few in the vegetations. The δ 13 C values of the tooth enamel of mammals in Xilinguole and Haibei are 12.9‰ and 13.5‰,or 14.1‰ and 14.7‰ heaver than their diets, respectively. The results in China and other countries are essenfially identical .This indicates that it womol be reliable to use it to study the paleovegetation in China. At the same time, the high temperature course such as fire probably does not have the notable influence on the δ 13 C values of enamel.更多还原