CAJ | 학술논문

天然放射性核素7Be具有沉降的连续性、能被土壤颗粒强烈吸附及较短半衰期等特性,近年来逐渐被应用于土壤侵蚀的研究,可示踪短期内和次降雨的土壤侵蚀速率,定量化描述坡面土壤侵蚀空间分布,也可与137Cs、210pb、226Ra和228Ra等相结合研究土壤侵蚀过程,表征流域土壤侵蚀状况.本文就7Be示踪土壤侵蚀的依据、目前的应用现状及研究中存在的问题加以简述,并探讨了今后研究的主要方向.
천연방사성핵소7Be구유침강적련속성、능피토양과립강렬흡부급교단반쇠기등특성,근년래축점피응용우토양침식적연구,가시종단기내화차강우적토양침식속솔,정양화묘술파면토양침식공간분포,야가여137Cs、210pb、226Ra화228Ra등상결합연구토양침식과정,표정류역토양침식상황.본문취7Be시종토양침식적의거、목전적응용현상급연구중존재적문제가이간술,병탐토료금후연구적주요방향.
7Be is a natural cosmogenic radionuclide with a relative short half-life of 53.3 d.It is mainly produced in the upper atmosphere as the product of the spallation of oxygen and nitrogen nuclei by cosmic rays.Through continuously wet and dry deposition,7Be is absorbed strongly by soil particle once it deposits onto the earth's surface.Therefore,it has been regarded as a valuable tracer to document short-term and individual-event soil erosion in recent years.Moreover,It also can be combined with other radionuclides (such as 137Cs,210pb,226Ra) to study soil erosion process.This paper reviewed the previous researches results,including the principle of using 7Be measurement to document soil erosion and the conversion models of soil erosion rates from 7Be data.The problems,suggestions and.prospects for further application of 7Be measurement were also discussed.