苏北梁王城遗址地层记录的环境演变与人类活动

ENVIRONMENTAL EVOLUTION AND HUMAN ACTIVITIES RECORDED IN THE LIANGWANGCHENG SITE,NORTHERN JIANGSU PROVINCE

梁王城遗址地层孢粉、质量磁化率、粒度和Rb/Sr等多环境替代指标分析结果表明该区在大汶口文化产生之前是冷湿的气候环境,大汶口文化时期气候与环境条件好转,略显温暖湿润,但也有较大的波动。西周文化时期,气候整体上较温暖湿润。但在中期出现冷干事件,之后又变暖湿,到晚期又转为冷干,体现出不稳定的气候环境。战国时期,较西周时期气候适宜。前半期较暖湿,后期较冷干,但总的看来,气候属于人类适宜期。北朝时期,早期较暖湿,人类栽培作物花粉含量相对较高,晚期转凉干,有显著的冷干事件。宋朝时期总体看气候环境较适宜,但气候异常事件较多。明清时期孢粉浓度整体较高,但中期较低,木本百分含量也增加,体现出较好的气候条件,但也有波动。孢粉数据显示在本遗址地层中,人类大规模栽培植物可能是从西周开始的。

The environmental history of the Liangwangcheng Site is analyzed using sporopollen, magnetic susceptibility, grain-size, and Rb/Sr data. The results reveal that the climate was cool and dry before the Dawenkou Culture Period, but was slightly warm and humid, with greater variations, during the Dawenkou Culture. During the Western Zhou Culture, the climate was relatively warm and moist. But it was cool and dry in the middle part of the Western Zhou Culture, then turned to wet, and then cool and dry, reflecting variable climates. The climate was overall mild in the Warring States Period compared with the Western Zhou Period. It was warm and moist in the first half of this period, and then cool and dry in the second half. During the early Northern Dynasties Culture, the climate was warm and pollen data indicate that human cultivation of crops was active. It was dry and cool during the later part of this period, with significant draught and cool events. The climate was amicable during the Song Dynasty Culture, but abnormal climatic events occurred. The sporepollen concentration was generally high in the Ming and Qing Dynasties, but relatively low in the middle part of this interval. Woody vegetation increased in this interval, indicating generally good climate conditions. Sporopollen data show that human cultivation in this site may have started from the Western Zhou Dynasty.