海南北部近2000年气候环境变化——来自双池玛珥湖高分辨率沉积记录
High Resolution Paleoenvironmental Evolution Revealed by a Lacustrine Sediment Sequence in Shuangchi Maar Lake during Past 2000 Years in North Hainan Island
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摘要: 利用海南双池玛珥湖沉积物的粒度、色度、磁化率及干密度等指标重建了该地区~2 007 cal a BP以来的环境和气候变化。在2 007~1 413 cal a BP期间，气候炎湿，植被覆盖度高，蒸发较强，湖盆近沼泽化；1 413~974 cal a BP期间，湖泊水位较高，气候温干，植被覆盖率较低，初级生产力降低；974~468 cal a BP期间，气候暖湿，降水渐增，湖区生产力增加，人类活动明显增强；468~184 cal a BP期间，气候相对湿热，湖深微有增加，人类活动在该阶段达到峰值；184cal a BP以来，气候相对温和，降水较上阶段减少，湖深不断下降，湖盆生产力不断降低。指标记录可识别出“中世纪暖期”（750~1 250 AD）和“小冰期”（1 250~1 750 AD），“小冰期”相对较湿润的气候条件与中国南方的湖泊记录具有一致性。Abstract: This study presents the record of paleoenvironmental evolution results from a radiocarbon-dated 565-cm-long lacustrine sediment sequence in Shuangchi Maar Lake. Measurements of grain size, magnetic susceptibility (MS), water content, dry density and color reflectance values have been carried out for reconstructing the climate since~2 007 cal a BP. Five distinct stages can be identified as follows. 2 007-1 413 cal a BP, the hot-humid climate was dominated this area and the lake level was shallow.The interval from 1 413-974 cal a BP was characterized by a relatively high lake level and mild climate. 974-468 cal a BP, it was a relatively humid climate with strong human activities. 468-184 cal a BP,this stage had the decreasing precipitation with increasing human activities. since 184 cal a BP, the climate was mild and the water depth was continuously reducing during this period. Relatively dryer MWP(750-1 250 AD) and wetter LIA(1 250-1 750 AD) could be detected in this sequence, which are consistent with the records of the lakes in South China.
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Key words:
- past 2000 years /
- Shuangchi Maar Lake /
- grain size /
- paleoenvironmental evolution
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