放射性核素137Cs 在土壤侵蚀研究中的应用

利用放射性核素铯-137(137Cs)进行土壤侵蚀研究能够简便、快速、准确地获取土壤流失、沉积和空间重新分布等详细信息。本文在简要总结该技术优越性和应用限制的基础上,重点讨论了区域137Cs输入背景值确定和定量转换模型选择等关键技术,同时对137Cs法应用的一些基本假设的合理性进行了探讨。认为改进取样方法,结合3S和航空测量技术,利用双核素或三核素同时示踪,可以使该技术在研究方法上更加成熟;加强137Cs与土壤碳和微生物以及其它土壤理化性质指标关系的研究,可以扩展该技术的应用领域。

Application of radioactive fallout cesium-137 for soil erosion measurement

Applying radioactive fallout cesium-137(()~(137)Cs) for soil erosion measurement,one can swiftly,accurately and conveniently acquire the detail information on soil erosion,sedimentation and spatial redistribution.This paper presented the fundamentals of this technique and summarized its advantages and limitations.Two key problems of()~(137)Cs technique,namely acquiring the reference value()~(137)Cs fallout in research area and selecting the quantitative model about the amount of()~(137)Cs lost from the erosion site and soil erosion rate,were discussed in detail.Some base assumptions of application()~(137)Cs technique are also discussed.Improving sampling method,integrating "3S" technique and aerial survey approach,using two or three nuclides as tracer at same time for soil erosion research can make the()~(137)Cs technique more perfect.Through Research on the relationship of()~(137)Cs with soil carbon,soil microorganism and other soil properties,the service fields of this technique will be extended.