| 青藏高原东部表土磁化率特征与环境意义 |
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| 引用本文： | 陈慧,杨胜利,成婷,刘楠楠,李帅,梁敏豪,唐国乾.青藏高原东部表土磁化率特征与环境意义[J].冰川冻土,2018,40(6):1187-1194. |
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| 作者姓名： | 陈慧 杨胜利 成婷 刘楠楠 李帅 梁敏豪 唐国乾 |
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| 作者单位： | 兰州大学 资源环境学院 西部环境教育部重点实验室,甘肃 兰州,730000;兰州大学 资源环境学院 西部环境教育部重点实验室,甘肃 兰州,730000;兰州大学 资源环境学院 西部环境教育部重点实验室,甘肃 兰州,730000;兰州大学 资源环境学院 西部环境教育部重点实验室,甘肃 兰州,730000;兰州大学 资源环境学院 西部环境教育部重点实验室,甘肃 兰州,730000;兰州大学 资源环境学院 西部环境教育部重点实验室,甘肃 兰州,730000;兰州大学 资源环境学院 西部环境教育部重点实验室,甘肃 兰州,730000 |
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| 基金项目： | 国家自然科学基金项目（41472147）；兰州大学中央高校基本科研业务费专项资金项目（lzujbky-2017-ct05；lzujbky-2015-k10）；兰州大学西部环境教育部重点实验室开放基金项目（lzujbky-2015-bt01）资助 |
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| 摘 要： | 现代表土磁化率与气候因子关系的研究是黄土古气候重建的重要内容，在黄土高原地区取得了重要进展，但在青藏高原地区相对不足。在青藏高原东部系统采集了106个表土样品，分析了其磁化率的变化特征；并通过表土磁化率与气候因子的相关分析，讨论了气候因子对高原东部现代表土低频磁化率和频率磁化率的影响。结果表明：研究区表土磁化率特征主要受到温度和降水量的影响，水热组合差异影响表土磁化率值的高低。低频磁化率与气候因子的相关性较弱，总体上与温度的相关性优于降水量，可能表明其与气候因子的关系比较复杂；频率磁化率百分比与降水呈较好的正相关关系，表明该指标对降水量的变化更为敏感，可以用于青藏高原东部的古降水定量重建。
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| 关 键 词： | 青藏高原东部 表土 磁化率 环境意义 |
| 收稿时间： | 2018-01-25 |
| 修稿时间： | 2018-10-23 |
The magnetic susceptibility of top soil in the eastern Tibetan Plateau: features and environmental implications |
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| CHEN Hui,YANG Shengli,CHENG Ting,LIU Nannan,LI Shuai,LIANG Minhao,TANG Guoqian.The magnetic susceptibility of top soil in the eastern Tibetan Plateau: features and environmental implications[J].Journal of Glaciology and Geocryology,2018,40(6):1187-1194. |
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| Authors: | CHEN Hui YANG Shengli CHENG Ting LIU Nannan LI Shuai LIANG Minhao TANG Guoqian |
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| Institution: | Key Laboratory of West China's Environmental System(Ministry of Education), College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | The relationship between magnetic susceptibility (MS) and climatic factors in modern topsoil is of great importance for regional magnetic enhancement mechanisms and paleoclimate reconstruction, which has had significant advancement in the Loess Plateau but not in the Tibetan Plateau. 106 samples of topsoil have been collected in the eastern Tibetan Plateau and variations of their MS have been analyzed by using Bartington Instruments MS2 Magnetic Susceptibility Meter. In addition, the effects of climatic factors on the low-frequency magnetic susceptibility (χlf) and frequency-dependent magnetic susceptibility (χfd) of modern topsoil in the eastern plateau were discussed based on the correlations between surface magnetic susceptibility and climatic factors. Climate data of topsoil were calculated by ARCGIS-interpolation of the mean annual temperature (MAT) and precipitation (MAP) from 1981 through 2010 from 274 meteorological stations. The results showed that MS of topsoil in the study area is mainly depended on temperature and precipitation, as well as the difference in hydrothermal composition which affected the MS value of topsoil. χlf has a little relation with climatic factors also. In addition, the correlation of χlf with temperature is better than that with precipitation. χfd is more sensitive to the change of precipitation and has a positive correlation with precipitation. This has clear indication significance and can be used for quantitative reconstruction of paleo-precipitation in the eastern part of the Tibetan Plateau. |
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| Keywords: | Tibetan Plateau topsoil magnetic susceptibility environmental significance |
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