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。
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.
出处
《地球科学进展》
CAS
CSCD
1998年第3期232-237,共6页
Advances in Earth Science
基金
国家自然科学青年基金
国家自然科学重点基金
关键词
环境地球化学
土壤侵蚀
核素示踪
云贵高原
Environmental geochemistry, Soil erosion, Radionuclide trace, Yunnan Guizhou Plateau.
