| 宇宙线散落核素7Be在山区表土层中的分布特征及侵蚀示踪原理 |
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| 引用本文： | 白占国,万国江,P. H. Santschi,M. Baskaran. 宇宙线散落核素7Be在山区表土层中的分布特征及侵蚀示踪原理[J]. 土壤学报, 1998, 35(2): 266-275 |
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| 作者姓名： | 白占国 万国江 P. H. Santschi M. Baskaran |
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| 作者单位： | 中国农业科学院土壤肥料研究所 |
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| 基金项目： | * 国家自然科学青年基金,批准号:49503049;国家自然科学重点基金,批准号:49333040;美国国家科学基金US 82-50 |
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| 摘 要： | 宇宙线散落核素7Be具稳定的物质来源和53.3天的半衰期,提供了示踪环境微粒季节性迁移的必要条件;其在土粒中主要存在于Fe-Mn氧化物及有机质结合相,适应于季节性微粒迁移示踪;它在表土层中的垂直分布特征提供了示踪微粒季节性迁移的充分条件。7Be在表土层中的累计值、表观比活度、最大渗透深度及相对侵蚀(或堆积)速率是土粒迁移的示踪参数。
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| 关 键 词： | 地球化学相 土层分布 示踪模型 土壤侵蚀 |
| 收稿时间： | 1996-08-13 |
| 修稿时间： | 1997-08-04 |
DISTRIBUTION OF COSMOGENIC 7Be IN SURFACE SOILS OF MOUNTAIN REGION AND THE PRINCIPLES FOR EROSION TRACE |
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| Bai Zhan-guo,Wan Guo-jiang,P. H. Santschi and M. Baskaran. DISTRIBUTION OF COSMOGENIC 7Be IN SURFACE SOILS OF MOUNTAIN REGION AND THE PRINCIPLES FOR EROSION TRACE[J]. Acta Pedologica Sinica, 1998, 35(2): 266-275 |
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| Authors: | Bai Zhan-guo Wan Guo-jiang P. H. Santschi M. Baskaran |
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| Affiliation: | Instilitute of Soil and Fertilizer, Chinese Academy of Agricultural Sciences, Beijing 100081;State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Academia Sinica, Guiyang 550002;Department of Marine Sciences, Texas A&M University, Galveston, Texas 77551, USA;Department of Marine Sciences, Texas A&M University, Galveston, Texas 77551, USA |
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| Abstract: | Beryllium-7, a cosmogenic nuclide, has stable sources in origin and half-life of 53.3 days, which provide essential conditions as a geochemical tracer for seasonal particle transport in the environment. A major portion of 7Be (about 95%) in the soils is bound to organic, Fe-Mn oxides and residual fractions. It can be removed with soil particle transport and be used to trace suil erosion. The characteristics of 7Be vertical distribution in the soil profiles provide sufficient evidence for trace of seasonal particle transport. 7Be inventory, apparent activity and maximum penetrative depth in soil cores as well as relative erosion or accumulation rate can be taken as trace parameters for sail ernsion. |
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| Keywords: | 7Be Distribution in soils Geochemical speciation Seasonal surface soil erosion. Trace model |
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