河南全新世黄土黑碳记录中自然与人为信号的分析与提取

As a proxy of fire, black carbon（BC）is an important tool to reconstruct the history of natural and anthropogenic fire. Based on lots of research done by scientists, BC has been an important basis for the study of ancient fire . However, how to identify natural and anthropogenic signals in black carbon record has been an unsolved important issue. In the project, the Holocene loess sections located in Xiangcheng, Henan are chosen to develop the method to identify natural and anthropogenic signals in BC records because there are both continous human activity and loess deposition during the Holocene in the region. Based on a variety of BC results measured by two different methods, BC sequence will be reconstructed. Natural fire usually has a biger scale and can affect a large region. Its BC material can be spread farther distance and the its occurrence is often accidental. While anthropogenic fire is usually controled by people and in turn is small scale. It is also a continuous fire-used activcity. According to these significantly difference of characteristics of natural and anthropogenic fire, and the research of pollen record and the ：As a proxy of fire, black carbon（BC）in sediments produced by natural fire and human activity, is an important tool to reconstruct the history of natural and anthropogenic fire. Based on lots of research done by scientists, BC has been an important basis for the study of ancient fire . However, how to identify natural and anthropogenic signals in black carbon record has been an unsolved important issue. In the project, the Holocene loess sections located in Xiangcheng, Henan are chosen to develop the method to identify natural and anthropogenic signals in BC records because there are both continous human activity and loess deposition during the Holocene in the region. Based on a variety of BC results measured by two different methods, BC sequence will be reconstructed. Natural fire usually has a biger scale and can affect a large region. Its BC material can be spread farther distance and the its occurrence is often accidental. While anthropogenic fire is.usually controled by people and in turn is small scale. It is also a continuous fire-used activcity. According to these significantly difference of.characteristics of natural and anthropogenic fire, the comprehensive BC index may be obtained from different BC records, which can be used to distinguish the type of fire, and identify the natural and anthropogenic signals in BC. It will help us to analyze the relation between anthropogenic fire and the evolution of ancient civilization, the comprehensive BC index may be obtained from different BC records, which can be used to distinguish the type of fire, and identify the natural and anthropogenic signals in BC. It will help us to analyze the relation between anthropogenic fire and the evolution of ancient civilization.

黑碳作为火的代用指标，是记录自然火灾与人类用火的重要载体。前人已经对沉积物黑碳做了大量的研究，使其成为古火灾研究的重要依据，但有一个重要科学问题亟待解决，即如何识别和提取黑碳记录中的自然与人为信号。本项目拟选择位于河南襄城及附近地区的全新世黄土剖面，利用不同的黑碳测量方法测定多种黑碳定量指标，获取该地区沉积物黑碳序列记录。利用自然火灾发生规模大、影响范围广、具有区域性和偶然性，而人类用火发生规模小、具有长期性和持续性等特点，再根据不同性质黑碳指标，结合孢粉记录和古文化遗址研究，构建能够区分自然火与人类用火的黑碳综合指标，分析和提取黑碳记录中自然和人为信号，帮助我们探讨人类用火与中原文明发展的关系。

沉积物中的黑碳是火的替代指标，火的发生往往与人类活动密切相关。黑碳含量变化指示了气候变化和人类活动强度的变化特征。.我们的研究主要是全新世黑碳研究在淮河流域半湿润区的应用以及对其自然与人为信号提取的尝试。主要内容如下：.淮河流域是全新世人类活动十分活跃的地区。通过实验获取淮河流域全新世剖面的黑碳记录，对比研究前人已有的气候变化特征、人类文化发展特征以及人口增长趋势特征，分析黑碳与火灾发生、气候变化、人类活动之间的关系。