摘要
系统介绍了7Be核素侵蚀示踪技术的原理和方法。7Be核素侵蚀示踪技术提供了短时期季节性或单次降水事件的水土流失信息,可为水土流失监测,土壤侵蚀模型试验研究提供重要信息数据。7Be核素侵蚀示踪技术具有不受场地限制、简便快捷,省时省力等特点。对工程建设弃土弃渣水土流失的监测,不用建立把口站或径流小区,只须在雨季后采一次样,或雨季(单次降雨)前后各采集一次样品,利用7Be核素侵蚀示踪技术就可精确估算出其水土流失量。
Cosmogenic environmental radionuclide 7Be, produced primarily by the bombardment of the earth＇s atmosphere by cosmic rays within the troposphere and stratosphere, has a similar environmental chemical behavior as 137Cs and 210Pb. With a half-life of 53.3 days, 7Be can be used to document short-term rates, patterns and seasonal variations of soil redistribution or sediment deposition representing the influences of a specific landuse or a particular event in a period of precipitation. Potential application of the information on soil erosion and redistribution provided by 7Be measurements can clearly include the validation and calibration of distributed event-induced soil erosion and sediment delivery models. 7Be technique, a potential alternative to 137Cs and 210pb in situations where information on short-term or event-based soil erosion is required, is considerably promising in soil erosion tracing, such as soil erosion on debris from project construction.
出处
《水土保持通报》
CSCD
北大核心
2006年第6期67-71,共5页
Bulletin of Soil and Water Conservation
基金
973项目(2003CB415201)
国家自然科学基金课题(40671120)
四川省科技攻关重要项目(05SG023007)
关键词
核素侵蚀示踪
7Be
弃渣弃土
水土流失监测
radionuclide tracing techniques
7Be
debris from construction
erosion monitoring
