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地球科学进展  2001, Vol. 16 Issue (4): 520-525    DOI: 10.11867/j.issn.1001-8166.2001.04.0520
综述与评述     
7Be在土壤侵蚀示踪中的应用研究进展
唐翔宇,杨浩,李仁英,赵其国
中国科学院南京土壤研究所,江苏 南京 210008
A REVIEW ON PROGRESSES ON APPLICATION OF THE 7Be TRACER TECHNIQUE IN THE ESTIMATE OF SOIL EROSION
TANG Xiangyu,YANG Hao,LI Renying,ZHAO Qiguo
Institute of Soil Science,  Chinese Academy of Sciences, Nanjing 210008,China
 全文: PDF(302 KB)  
摘要:

7Be是一种自然产生的放射性核素,由对流层和同温层大气中的氧和氮在宇宙射线作用下分裂生成,其半衰期为53.3天。7Be通过连续的干湿沉降作用到达土表,被土壤颗粒紧密吸附,其土壤环境化学行为与137Cs相似,因此,可以用于示踪某种特定土地利用方式或侵蚀事件下的土壤侵蚀作用的强度、空间分配以及季节性变化。7Be技术可与其它反映中长期土壤侵蚀的放射性核素(137Cs、210Pb)示踪技术相结合,共同表征某个流域的土壤侵蚀状况。对7Be示踪技术现有的土壤侵蚀速率定量估算模型进行了简述,并提出了各自的局限性及今后的研究方向。

关键词: 7Be土壤侵蚀速率示踪定量模型    
Abstract:

7Be is a cosmogenic radionuclide (half-life, 53.3 days) produced by spallation of oxygen and nitrogen atoms within the troposphere and stratosphere. Subsequently, it is transported to the soil surface by wet and dry deposition, and fixed by the soil particles rapidly and strongly. It has a similar environmental chemical behavior as 137Cs. Therefore, it can be used to document the short-term rates, patterns and seasonal variations of soil redist ribution representing the influences of specific land use or particular event, such as a storm. The 7Be tracer technique can be used as a complement to ot her alternative radioactive tracer techniques (such as 137Cs and 210Pb), which can be employed to examine the medium or long term rate soil erosion, in the investigation on the characteristics of soil erosion occurred, especially, in the analysis of the dominant type of erosion process, within the specific catchment. The existing quantitative models for soil erosion estimate using 7Be tracer technology was reviewed in this paper, and some additional intensive works were also suggested.

Key words: Rate of soil erosion    7Be    Quantitative model
收稿日期: 2000-11-16 出版日期: 2001-08-01
:  S157.1  
基金资助:

国家重点基础研究发展规划项目“土壤质量时空演变规律与持续利用”子课题“红壤侵蚀示踪与侵蚀动态监测与预测研究”(编号:G1999011801)资助.

通讯作者: 唐翔宇(1972-),男,浙江省江山县人,博士研究生,主要从事土壤侵蚀的示踪研究.     E-mail: xytang@issas.ac.cn
作者简介: 唐翔宇(1972-),男,浙江省江山县人,博士研究生,主要从事土壤侵蚀的示踪研究. E-mail:xytang@issas.ac.cn.
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引用本文:

唐翔宇,杨浩,李仁英,赵其国. 7Be在土壤侵蚀示踪中的应用研究进展[J]. 地球科学进展, 2001, 16(4): 520-525.

TANG Xiangyu,YANG Hao,LI Renying,ZHAO Qiguo. A REVIEW ON PROGRESSES ON APPLICATION OF THE 7Be TRACER TECHNIQUE IN THE ESTIMATE OF SOIL EROSION. Advances in Earth Science, 2001, 16(4): 520-525.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2001.04.0520        http://www.adearth.ac.cn/CN/Y2001/V16/I4/520

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