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宇宙线成因的短寿命核素7Be在土粒中与有机质及铁-锰氧化物相结合;在表土层中随深度呈对数递降,显示出7Be具土壤季节性侵蚀与湖泊沉积作用耦合关系的良好示踪价值。红枫湖沉积物中绝大部分137Cs处于固定态,揭示了其计年时标的可靠性;沉积物中1975年137Cs次级蓄积峰的存在,增加了其计年价值。沉积物中210Pb-210Po的再迁移性受铁-锰界面循环的控制,并可能影响210Pbex计年。
The short lived nuclear 7Be in cosmic ray was combined with organic matter and iron-manganese oxide in soil particles and decreased logarithmically with depth in the topsoil, indicating a coupling relationship between 7Be soil seasonal erosion and lacustrine sedimentation Good tracer value. Most of the 137Cs in the sediments of Hongfeng Lake were in a fixed state, which revealed the reliability of the chronometer; the existence of the 137Cs secondary accumulation peak in sediments in 1975 increased their annual value. Re-migration of 210Pb-210Po in sediments is controlled by the iron-manganese interface cycle and may affect 210Pbex years.