The stable carbon isotope composition of total organic matter (δ¹³C_org) in loess deposits has been widely used as a valuable proxy for reconstructing terrestrial paleovegetation. Aeolian loess is widely distributed on the high Tibetan Plateau (TP); however, little is known about the variability and paleoenvironmental implications of the δ¹³C_org of Tibetan loess. We conducted detailed δ¹³C_org and total organic carbon analyses of the Ganzi loess sequence on the eastern TP since the last interglacial (LIG). Our results indicate that the δ¹³C_org values of loess during glacial periods were lower than those during interglacial periods, with more negative values associated with the cold stages since the LIG on the eastern TP. The reconstruction of vegetation from the δ¹³C_org data indicated that C₃/C₄ mixed vegetation was dominated by C₃ vegetation, and that the relative abundance of C₄ vegetation during the glacial stages was much lower than that during MIS 5 and MIS 3. The high relative abundance of C₄ plants during MIS 5 and MIS 3 suggested an increased proportion of C₄ plants during the warm period. Since the LIG, the change in the abundance of C₃/C₄ vegetation in the Ganzi region has been mainly controlled by climate change at the glacial–interglacial scale. The combined effect of temperature, precipitation, and atmospheric CO₂ caused changes in the paleovegetation on the eastern TP.

的总有机物质（δ稳定的碳同位素组合物¹³ Ç_有机黄土沉积物）已被广泛地用作用于重建地面古植被一个有价值的代理。风沙性黄土广泛分布在青藏高原（TP）上。然而，鲜为人知的是，该δ的变化和古环境的影响¹³ Ç_组织藏族黄土。我们进行了详细的δ ¹³ C ^_组织和自末次间（LIG）甘孜黄土上东部TP序列的总的有机碳的分析。我们的研究结果表明，δ ¹³ C ^_组织自东部TP以来的LIG以来，冰川期的黄土值低于冰川期的值，而与寒冷期相关的负值更大。植被的从δ重建¹³ Ç_组织数据表明是c ₃ / C ₄混合植被被C支配₃植被，以及C的相对丰度₄植被在冰阶段被多比MIS 5和MIS过程中降低3.在MIS 5和MIS 3期间C ₄植物的相对丰度高，表明在温暖时期C ₄植物的比例增加。自LIG以来，C ₃丰度的变化甘孜地区的/ C ₄植被主要受冰川-冰川间规模的气候变化控制。温度，降水和大气CO ₂的综合作用导致了东部TP上古植被的变化。