近2万年来豫西黄土堆积揭示的植被演替、气候变化与古人类活动

Western Henan province located in southern part of loess plateau, human activities since late pleistocene were very frequent, earth has experienced a mediaeval warm period and a extremely cold period in recently 20 ka. Further study of loess and environmental change in this area is helpful to understanding the relationship of human activity and environmental change. However, for a long time，this area lacking high resolution environment record. In this project, we will sampling three representative loess sections in the western Henan province, then establish time scale by optically stimulated luminescence(OSL).Combined with investigations of organic matter δ13C, pollen, grain size, organic matter content and magnetic susceptibility we will reconstruct the paleovegetation and paleoenvironmental changes since 20 ka. On this basis,we collection information of ancient human activities in this area, and comparative analysis with reconstructed paleovegetation and paleoenvironmental records. The results above will provide theoretical basis for understanding the relationship between human activity and environment.

晚更新世以来河南省西部地区古人类活动非常频繁，该地区地处黄土高原东南缘，2万年以来经历了一次极冷和全新世大暖期的巨大变化，对这一地区黄土-环境记录的深入研究，有助于理解晚更新世古人类活动与环境变化之间的关系。然而，长期以来由于测年、沉积记录等因素的限制，本区缺乏高分辨率的古气候变化记录，制约了环境变化与人类适应的理解。本项目拟选取河南省西部3个代表性黄土剖面，采集晚更新世以来的黄土-古土壤样品，通过光释光（OSL）测年建立年代标尺。通过测试黄土有机质 δ13C，结合孢粉、粒度、有机质含量和磁化率等环境指标分析，建立2万年以来的植被、气候变化序列。在此基础上，收集整理该区域古人类活动资料，将古植被、古气候重建结果和该区古人类活动记录对比，为理解中原地区2万年以来人类活动与环境之间的关系提供科学依据。