三峡库区紫色土~7Be剖面分布及季节变化
Depth Distribution and Seasonal Variability of ~7Be in Purple Soils at Three Gorges Reservoir Region
查看参考文献26篇
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文摘
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~7Be是一种宇宙成因放射性核素.由于其来源明确、半衰期短、测试相对容易,可用于<1 a时间尺度内的环境过程示踪和定量研究.~7Be在土壤中的剖面分布特征及其本底值是建立定量模型、估算侵蚀沉积速率和调查表土迁移过程的基础.对三峡库区为期1a的无扰动紫色土~7Be浓度的测定结果表明,~7Be主要分布于质量深度0~ 20.0 kg/m~2(0~1.5cm)的表层土壤,其中0~3.0 kg/m~2(0~2 mm)的最表层~7Be比活度最高,向下随深度增加呈指数减少,20.0 kg/m~2以下土层基本不含7~Be.采样期间土壤7~Be总面积活度介于172.4~328.6 Bq/m~2,平均246.1 Bq/m~2,并呈现春季最高,秋季最低;春夏高,秋冬低的季节性变化特征.植被截留可能是减少土壤7~Be浓度的重要因素 |
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其他语种文摘
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~7Be is a naturally occurring radionuclide of cosmogenic origin. Due to its well-defined source term, short half-life, and relative ease of measurement,~7Be serves as a useful tool for tracing and quantifying environmental processes on the <1 a timescale. The characters of its depth distribution and reference inventory in soils are the basis of developing soil redistribution models and investigating movement of topsoil. Measurements of ~7Be concentration in undisturbed soils were carried out at Three Gorges Reservoir region over 1 year. The results show that ~7 was predominantly distributed in the surface soil of 0~20.0 kg/m~2 mass depth (0~1.5 cm).The highest 7~Be content was found in the surface horizon of 0~3.0 kg/m~2 mass depth (0~2 mm) and declined exponentially with depth. The soil horizon below 20.0 kg/m~2 mass depth contained little ~7Be.The local 7~Be reference inventories over the sampling period were 172.4~328.6 Bq/m~2 with a mean of 246.1 Bq/m~2.The reference inventories were high in spring and summer and low in autumn and winter, which were highest in summer and lowest in autumn. The interception of vegetation may be an important factor in reducing ~7Be flux to soils |
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来源
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山地学报
,2010,28(6):674-679 【核心库】
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关键词
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放射性核素
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~7Be
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紫色土
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三峡库区
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地址
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中国科学院水利部成都山地灾害与环境研究所, 四川, 成都, 610041
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1008-2786 |
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学科
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农业基础科学 |
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基金
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国家科技支撑计划项目
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中国科学院知识创新工程西部行动计划项目
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文献收藏号
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CSCD:4061473
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