13kaBP以来滇池地区古环境演化

来源 :湖泊科学 | 被引量 : 0次 | 上传用户:kyd1472
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根据DC93一1孔孢粉组合、总有机碳(TOC)、总氮(TN)、碳氮比(C/N)、有机碳同位素δ13Corg、磁化率(χ)、频率磁化率(χfd)等资料,结合14C、210Pb和137Cs测年,滇池地区13ka以来的古环境演化历史经历了以下几个阶段:13—10.2kaBP.气候偏凉湿,湖水深度不大;10.2-7.5kaBP,气候向暖湿过渡.湖水渐深;7.5-4.0kaBP,气候暖湿,出热条件达到最佳配制,湖水也最深.6.5kaBP前后,气温最高,这一时段古气候状况存在次级波动;4.0-2.7kaBP,气候突转干旱.湖水最浅;2.7-1.7kaBP,气候温湿,湖面扩大,湖水变深;1.7kaBP,人类活动影响的加剧,使湖泊环境的变化更为复杂. According to the data of DC93-1 sporopollen assemblage, TOC, TN, C / N, δ13Corg, magnetic susceptibility (χ) and frequency magnetic susceptibility (χfd) Based on the dating of 14C, 210Pb and 137Cs, the paleoenvironment evolution history of Dianchi Lake since 13ka has experienced the following stages: 13-10.2kaBP. The climate is cool and wet, and the depth of the lake is not big; 10.2-7.5kaBP, the climate transitions to warm and wet. The lake is getting deeper; 7.5-4.0kaBP, the climate is warm and humid, the heat extraction conditions are the best and the lake is the deepest. Before and after 6.5kaBP, the temperature was the highest, and the paleoclimatic conditions in this period had secondary fluctuations; 4.0-2.7kaBP, the sudden arid climate. The most shallow lake; 2.7-1.7kaBP, warm and humid climate, the lake expanded, the lake deepened; 1.7kaBP, the impact of human activities intensified, changes in the lake environment more complicated.
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