5kaB.P.鄱阳湖地区古气候演化的有机碳稳定同位素记录

Organic carbon stable isotope records of dimate evolution in Poyang Lake in the past 5 k a years

根据鄱阳湖沉积岩芯ZK01有机碳同位素以及沉积特征等环境指标的综合分析,并同鄱阳湖湖口地区孢粉组合特征相结合,重建鄱阳湖地区5kaB.P.以来的古气候演变.结果表明:5.0～4.2kaB.P.,气候以暖湿为主;4.2～3.9kaB.P.以冷湿为主;3.9～3.2kaB.P.,气候转温和,以温偏干气候为主;3.2～3.0kaB.P.,气候凉偏干;3.0～2.8kaB.P.,暖偏干气候为主;2.8～2.2kaB.P.,以凉偏湿为主;2.2～1.2kaB.P.,较长时期的温暖湿润气候;1.2～0.2kaB.P.,对应的冷湿气候特征;0.2kaB.P.到现在,气候又开始变得越来越温暖,可能是人类活动的影响所致.

This paper, based on the data of organic carbon stable isotope ratios, reconstructed the sequences of climate evolution in the past 5 k a years in Poyang Lake (in Jiangxi province). The results of the research indicated that the climate evolution in the past 5 k a years can be divided into nine stages. 5.0～4.2 k a B.P., the climate was inclined to warmtemperate condition and organic carbon stable isotope ratios of lake sediment in Poyang Lake were highest; 4.2～3.9 k a B.P., the cold and wet climate became prevailing, followed by the warm and dry climate in 3.9～3.2 k a B.P., and cool and dry climate in 3.0～2.8 k a B.P.. Since 2.8 k a B.P., the climate changed to be cool and wet, warm and wet in 2.2～1.2 k a B.P., cold and wet in 1.2～0.2 k a B.P., from 0.2 k a B.P. to now, the climate became warmer due to intensively impact of human activities.