滇西和黔中表土中7Be与137Cs分布特征对比研究

doi:10.13249/j.cnki.sgs.2002.01.43

地理科学 ›› 2002, Vol. 22 ›› Issue (1): 43-48.doi: 10.13249/j.cnki.sgs.2002.01.43

滇西和黔中表土中⁷Be与¹³⁷Cs分布特征对比研究

白占国^1,2, 万国江²

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, 贵州, 贵阳, 550002

收稿日期:2001-01-05 修回日期:2001-06-30 出版日期:2002-01-20 发布日期:2002-01-20
基金资助:
国家自然科学基金(49971053,49773207,49894170,49333040)及瑞典国际科学基金(A/2704-1,IFSofSweden)部分资助.

A Comparative Study on Distribution of ⁷Be and ¹³⁷Cs in the Surface Soils in the Western Yunnan and the Central Guizhou Provinces

BAI Zhan-guo^1,2, WAN Guo-jiang²

1. Chinese Agricultural Ministry Key Laboratory of Plant Nutrition Research, Institute of Soil and Fertilizer, the Chinese Academy of Agricultural Sciences, Beijing 100081;
2. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, the Chinese Academy of Sciences, Guiyang, Guizhou 550002

Received:2001-01-05 Revised:2001-06-30 Online:2002-01-20 Published:2002-01-20

摘要/Abstract

摘要： 滇西和黔中28个表土剖面分层土样⁷Be、¹³⁷Cs比活度对比分析可见:滇西地区表土层顶部⁷Be/¹³⁷Cs为100～1 000,而黔中地区仅10～100;两地区表土层中⁷Be的表观比活度和最大渗透深度总体相近;¹³⁷Cs在黔中表土层中的比活度总体较滇西地区略高.而黔中表土中⁷Be累计值的偏低现象,映射了该地区强烈的水土流失.为解释滇西和黔中地区之间表土层顶部⁷Be/¹³⁷Cs的地区差异,需进一步讨论两核素的湖泊沉积物蓄积特征.

Abstract: The analytical results of ⁷Be and ¹³⁷Cs activities in the 28 surface soil profiles in the Yunnan Guizhou Plateau have shown that the ⁷Be/ ¹³⁷Cs activity ratios on the topsoils reached 100-1000 in the western Yunnan, but only 10-100 for the central Guizhou region. The apparent activities and Maximum penetrative depth of ⁷Be in the soils of the two regions are totally close. However, ¹³⁷Cs activities in the surface soils in the central Guizhou are overall a little higher than that in the western Yunnan. The phenomena that ⁷Be inventories in the soil cores at the most sampling sites in the central Guizhou were relatively low would just reflect the serious soil erosion in the region. ⁷Be inventories in the soil cores in the western Yunnan obviously differed from that in the central Guizhou, which mainly embodied that the ⁷Be inventories in the soil cores in the Lake Lugu watershed in Summer Autumn were apparently higher than that in Lake Hongfeng/Baihua watershed and also higher than that in Lake Erhai watershed as well. This could be related to ⁷Be high precipitation in summer and altitude. To explain the regional differences of ⁷Be/ ¹³⁷Cs activity ratio on the topsoils between the western Yunnan and the central Guizhou, the accumulative characteristics of ⁷Be and ¹³⁷Cs in the lake sediments should be further understood.

中图分类号:

白占国, 万国江. 滇西和黔中表土中⁷Be与¹³⁷Cs分布特征对比研究[J]. 地理科学, 2002, 22(1): 43-48.

BAI Zhan-guo, WAN Guo-jiang. A Comparative Study on Distribution of ⁷Be and ¹³⁷Cs in the Surface Soils in the Western Yunnan and the Central Guizhou Provinces[J]. SCIENTIA GEOGRAPHICA SINICA, 2002, 22(1): 43-48.

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滇西和黔中表土中⁷Be与¹³⁷Cs分布特征对比研究

A Comparative Study on Distribution of ⁷Be and ¹³⁷Cs in the Surface Soils in the Western Yunnan and the Central Guizhou Provinces

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