中文摘要：

本文对陕西凤翔孙家南头秦墓出土的春秋战国时期人骨中C和N稳定同位素组成进行了测试分析。结果表明：人骨样品均可用于食谱分析；由δ13C和δ15N值综合分析可知，春秋战国时期陕西凤翔地区秦先民是以C4类植物为主食、辅以少量肉食的杂食性食谱；经济模式可能为农业与畜牧兼营，以种植黍、粟类等旱地作物的农业形式为主，并辅以驯养牲畜；根据墓主与殉人的δ13C和δ15N值对比分析，推测殉人可能是与墓主饮食方式较为相近的姬妾或仆从之类的人；春秋中期至战国晚期秦先民的食物结构较为稳定，C4植物比例与δ15N发生变化的原因可能与当时历史的变迁与社会的发展有一定的关系。

英文摘要：

In this research, carbon and nitrogen stable isotopes in human bones dating from the Spring and Autumn periods were analyzed from the Sunjianantou site, Fengxiang, Shaanxi Province. All samples were well preserved and could be clearly used as dietary indicators. During these periods, the ancient Qin peoples＇ diet mainly relied on C4 plants and some meat, based on the comprehensive analysis of δ13C and δ15N values. From this analysis, we suggest that the substance strategy was a mixture of agriculture and herding. According to the comparative analysis of δ13C and δ15N values, the human as funerary objects probably represent concubines or attendants whose diet was similar to their owners. Obviously the diet of Qin ancestors was stable from Spring and Autumn period through to the Warring States period, and any change in the proportions of C4 and value of δ15N were related to the historical transition of the society.