基于从中国南部的亚山泥炭地获得的多代理记录,对Holocene期间环境变化的自然和人为控制
Xiaoxu Qu1, Chao Huang2, Zhiguo Rao3
1Laboratory for Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, Guangdong 524088, China.
The Science of the total environment
|December 30, 2023
概括
在过去的1000年里,人类活动对中国南部的环境产生了重大影响,超过了自然气候变化. 泥炭核心分析显示,人口增长导致土壤侵蚀和金属使用增加.
科学领域:
- 古气候学 古气候学
- 环境科学 环境科学
- 考古学的考古学
背景情况:
- 由于缺乏可靠的记录,了解中国南部亚热带山区过去的气候和人类相互作用是有限的.
- 这项研究通过检查Holocene气候演变和人类环境动态来解决这个差距.
研究的目的:
- 用多个代理记录重建了全新纪南中国的古水文变化.
- 研究东亚夏季季风 (EASM) 变化,自然气候驱动因素和区域人类活动之间的相互作用.
主要方法:
- 来自西旺古提安 (SWGT) 泥炭地的一块亚山泥炭核心的分析,使用10个AMS 14C日期进行日期.
- 使用的代理指标:碳同位素 (δ13C),点火损失 (LOI),磁性易感性 (MS),化学变化指数 (CIA) 和地化学元素.
主要成果:
- 重建的全新纪湿度水平显示一个干旱-湿-干旱的模式.
- 确定了三个气候阶段:弱EASM/干燥 (11,6009000 BP),强EASM/潮湿 (90004000 BP) 和相对干燥 (4000 BP之后).
- 在过去的1000年中观察到MS和重金属的增加,与湖南省的人口增长相关,表明土壤侵蚀和金属工具使用的增加.
结论:
- 全新时代EASM强度受到太阳晒照,ITCZ迁移和ENSO活动的影响.
- 人类的影响,由人口增长,耕地扩张和采矿驱动,成为过去1000年塑造环境的主导因素.
- 该地区的环境变化主要是由人类活动驱动的,超过了自然气候控制.
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