过去2000年科尔沁沙地演化过程研究

The Horqin dunefield is located in the marginal region of the East Asian Summer Monsoon, and is therefore sensitive to the monsoon variation. Human occupation in this area began in the Neolithic period and has been continuous since then. These characteristics make the Horqin dunefield a valuable laboratory for exploring the response of historical environmental change to natural and anthropogenetic impacts. In the current study, multiple aeolian sand-paleosol sections distributed in the interior of the Horqin dunefield will be dated systematically using the quartz OSL dating method. Combining with OSL chronology and the proxy analysis of representative lake sediments, the evolution process of the Horqin dunefield during the last 2000 years will be reconstructed and the environmental events will be recognized. Then, we will explore the relative roles of climatic change and human activity of the last 2000 years in the evolution of the Horqin dunefield, which may provide valuable insight into the environmental change in future and policy decision for environmental protection.

科尔沁沙地位于东亚夏季风北缘的半湿润-半干旱区，对气候变化响应敏感，从新石器时代开始频繁的人类活动就已存在并持续至今，是研究环境变化过程及其自然与人文背景的理想区域。本申请计划对科尔沁沙地的风成沉积剖面和湖泊沉积岩芯分别进行系统的光释光测年和AMS14C测年以建立可的靠年代标尺；此基础上，结合风成沉积地层分析和湖泊沉积环境代用指标的解读，重建过去2000年较高分辨率的科尔沁沙地演化过程并识别其中的重要环境事件；结合已有的历史时期气候重建结果和历史文献及考古资料记录的人类活动特征，探讨过去2000年气候变化和人类活动对科尔沁沙地演化过程的可能影响。研究结果将为正确认识全球变暖背景下本区环境变化趋势及环境治理决策提供历史借鉴。

科尔沁沙地位于东亚夏季风北缘的半湿润-半干旱区，对气候变化响应敏感，从新石器时代开始频繁的人类活动就已存在并持续至今，是研究环境变化过程及其自然与人文背景的理想区域。本项目基于科尔沁沙地内部不同地貌位置25个风成沉积剖面的68个风成沙样品的光释光年代，结合历史文献记录，重建了过去2000 年科尔沁沙地的演化过程，识别出了四次沙丘活化事件；结合已有的历史时期气候重建结果和历史文献及考古资料记录的人类活动特征，分析了气候变化和人类活动对科尔沁沙地演化过程的可能影响。研究结果可以为正确认识全球变暖背景下本区环境变化趋势及环境治理决策提供历史借鉴。