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OALib Journal期刊
ISSN: 2333-9721
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云南抚仙湖近现代沉积速率变化研究
DOI: 10.11821/xb201111011, PP. 1551-1561
Keywords: 210Pb计年,137Cs计年,抚仙湖,沉积速率,人类活动
Abstract:
借助GPS定位,采集了云南抚仙湖不同区域的7个沉积物柱芯。通过对抚仙湖沉积物柱芯样品的放射性核素210Pb和137Cs测试分析,发现所有柱芯中均存在3个公认的137Cs计年时标(1954年137Cs首次沉降、1963年全球公认的137Cs最大沉降蓄积峰和1986年前苏联切尔诺贝利核事故产生的137Cs沉降蓄积峰),部分柱芯中存在20世纪70年代中期中国大气核试验形成的1975/1976年次级蓄积峰,分析了该次级定年时标存在的合理性。借助210PbCRS计年模式获得了抚仙湖过去百余年来的沉积年代,与137Cs时标计年结果相比较存在一定偏差,对两种计年结果产生差异的可能原因进行了探讨。基于210Pb和137Cs计年结果,结合历史文献记载得出,自19世纪中期以来,抚仙湖各个沉积物柱芯(FX6除外)的沉积速率变化规律具有相似性,大致可以划分为3个阶段A自然演化阶段,B人为扰动阶段,C人为改造阶段。这种不稳定的沉积环境与抚仙湖地区相应历史时期的人类活动有密切关系,表明人类活动是影响短时间尺度下环境变化的主要驱动力。
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