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中国沙漠  2020, Vol. 40 Issue (4): 10-17    DOI: 10.7522/j.issn.1000-694X.2020.00012
王梓莎1,2(), 苗运法1,2(), 赵永涛1, 李芳1, 雷艳1,2, 向明星1,2, 邹亚国1,2
1.中国科学院西北生态环境资源研究院 沙漠与沙漠化重点实验室,甘肃 兰州 730000
2.中国科学院大学,北京 100049
Characteristics of microcharcoal in the lake surface sediments in the northern margin of Qaidam Basin of China and its environmental significance
Zisha Wang1,2(), Yunfa Miao1,2(), Yongtao Zhao1, Fang Li1, Yan Lei1,2, Mingxing Xiang1,2, Yaguo Zou1,2
1.Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
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关键词: 柴达木盆地炭屑表层沉积物火(灾)植被人类活动    

Microcharcoal in the surface sediments is of great significance in exploring the basic characteristics of fire and its relationship with vegetation and human activities. Here we analyzed the microcharcoal extracted with the pollen methodology from the surface sediments of lakes in the northern margin of Qaidam Basin to explore its spatial distribution and relationship with regional vegetation and modern human activities. Results showed that the microcharcoal concentration of different grain-size groups has a similarity trend of increasing from northwest to northeast of the basin, which can be coupled with the trend of increasing regional vegetation coverage from west to east. The microcharcoals with the small grain-size (<50 μm) are mostly in the shape of sub-round, which indicates that there is more woody vegetation burning in fires with longer distances. And the sub-long grains microcharcoal with large grain size (>50 μm) is dominant, indicating that the burning of herbaceous plants increased gradually to the east, which consistent with the distribution of herbaceous plants, and the distance from the fire to the sedimentary area of microcharcoal is reduced. Additionally, the population of this area also has a tendency to increase from west to east. Human activities also have a certain impact on the microcharcoal concentration, our analyses show that the microcharcoal concentration has a good correspondence with the population density. Therefore, the spatial variation characteristics of microchacoal in surface sediments not only reflect the fire information of the corresponding areas but also have a good indication for regional vegetation and human activities.

Key words: Qaidam Basin    microcharcoal    surface sediments    fire    vegetation    human activities
收稿日期: 2019-10-30 出版日期: 2020-09-01
:  Q944.571  
基金资助: 中国科学院“西部之光”人才培养计划项目;国家自然科学基金项目(41772181);甘肃省自然科学基金项目(18JR3RA395);国家“万人计划”青年拔尖人才项目和中国科学院青年创新促进会优秀会员项目
通讯作者: 苗运法     E-mail:;
作者简介: 苗运法 (E-mail:
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王梓莎, 苗运法, 赵永涛, 李芳, 雷艳, 向明星, 邹亚国. 柴达木盆地北缘湖泊表层沉积物炭屑特征及其环境意义[J]. 中国沙漠, 2020, 40(4): 10-17.

Zisha Wang, Yunfa Miao, Yongtao Zhao, Fang Li, Yan Lei, Mingxing Xiang, Yaguo Zou. Characteristics of microcharcoal in the lake surface sediments in the northern margin of Qaidam Basin of China and its environmental significance. Journal of Desert Research, 2020, 40(4): 10-17.


图1  采样点位置及植被类型图(数据来源于国家自然科学基金委“中国西部环境与生态科学数据中心”
表1  采样点情况[24]
图2  光学显微镜下炭屑、石松孢子和有机质
图3  扫描电镜下的炭屑及能谱分析A:扫描电镜下的炭屑;B:该图像碳元素面分布图像,越红代表碳元素含量越高;C:该炭屑能谱图,打点位置见A,其中Au源于镀金涂膜
图4  炭屑浓度变化
图5  炭屑“大小比”和“长圆比”
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