| 现代侵蚀作用核素示踪研究新进展 |
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| 引用本文： | 白占国,万国江.现代侵蚀作用核素示踪研究新进展[J].地球科学进展,1998,13(3):232-237. |
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| 作者姓名： | 白占国 万国江 |
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| 作者单位： | 1. 中国农业科学院土壤肥料研究所农业部植物营养学重点实验室,北京,100081
2. 中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳,550002 |
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| 基金项目： | 国家自然科学青年基金,国家自然科学重点基金 |
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| 摘 要： | 利用放射性核素示踪环境地球化学过程是国际地球科学的前缘课题。介绍了利用宇宙线成因的短寿命散落核素7Be示踪土壤季节性侵蚀及其与湖泊沉积耦合关系的最新研究进展；证实了利用核爆炸散落核素137Cs示踪累计性土壤侵蚀和沉积计年的可靠性；阐述了226Ra和228Ra在土壤中比活度的形态变化分异具有很好的侵蚀－堆积示踪价值；揭示了在不同生物化学条件下，210Pb的行为特征和影响因素，并将210Pbex示踪碳酸盐岩区域土壤侵蚀速率结果与湖泊沉积速率相耦合，证明了利用210Pb示踪土壤侵蚀的可行性。
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| 关 键 词： | 环境地球化学 土壤侵蚀 核素示踪 云贵高原 |
| 收稿时间： | 1997-07-22 |
| 修稿时间： | 1997年7月22日 |
PROGRESS IN THE STUDY OF THE SOIL EROSION USING RADIONUCLIDES |
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| BAI Zhan-guo,WAN Guo-jiang.PROGRESS IN THE STUDY OF THE SOIL EROSION USING RADIONUCLIDES[J].Advance in Earth Sciences,1998,13(3):232-237. |
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| Authors: | BAI Zhan-guo WAN Guo-jiang |
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| Institution: | 1.Key Laboratory of Plant Nutrition of Ministry of Agriculture, Institute of Soils and Fertilizers,Chinese Academy of Agricultural Sciences, Beijing 100081；2.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002 |
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| Abstract: | In this paper, we described the latest progress in the study on seasonal surface soil erosion and its coupling relationship to lake sedimentation using 7Be. Meanwhile, 137 Cs reliability for tracing soil particle accumulation and for sediment dating was confirmed. Differentiation of 226 Ra/ 228 Ra activity ratios in different geochemical fractions in the soils could be used as a parameter to trace accumulation and/or erosion of soil particles. 210 Pb geochemical behaviour in the soils and sediments and its effecting factors was studied under different conditions. The coupling relationship between soil erosion rates traced by 210 Pb and lake sedimentation proved that 210 Pb was reliable for tracing accumulation rate of soil particles. |
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| Keywords: | Environmental geochemistry Soil erosion Radionuclide trace Yunnan Guizhou Plateau |
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