论文部分内容阅读
通过对鄱阳湖中大汊湖DCH孔沉积物粒度、磁化率、孢粉、有机碳含量等指标的综合分析,恢复了鄱阳湖2000年来环境演化过程。研究表明,鄱阳湖经过多次扩张,形成如今的格局。约在1500aB.P.前后水面由北向南扩张至大汊湖附近。大汊湖由古赣江河流洼地(1500aB.P.前)发展为赣江三角洲分流间洼地。该地区气候的变化经历了多次波动,900aB.P.以前偏干,气温略高于后期;900aB.P.以后偏湿,在450aB.P.前后温度偏低。鄱阳湖人类活动出现较早,人类活动随自然环境的变化在湖泊沉积物中有所反映。
Through the comprehensive analysis of the sediment grain size, magnetic susceptibility, sporopollen and organic carbon content of DCH hole in Poyang Lake, the environmental evolution of Poyang Lake was restored in 2000. Research shows that Poyang Lake has been expanded many times to form today’s pattern. About 1500aB. P. Before and after the water surface expansion from north to south near the lake. Dalai Lake from the ancient Ganjiang River depression (1500aB.P. Front) developed into the delta in the delta of the Ganjiang River. The climate change in the region has undergone several fluctuations, 900aB. P. Dry before, the temperature slightly higher than the late; 900aB. P. After partial moisture, at 450aB. P. Before and after the temperature is low. Human activities in Poyang Lake occur earlier, and human activities are reflected in sediments of lakes as their natural environment changes.