A HIGH-RESOLUTION PALYNOLOGICAL RECORD AND ITS PALEOENVIRONMENTAL INTERPRETATION IN THE LOW LATITUDE OF SOUTH CHINA SEA SINCE LAST DEGLACIATION
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摘要: 根据南海低纬地区SA09-090孔高分辨率的孢粉记录,从下至上划分了4个孢粉组合带,依据孢粉成分的变化,重建了15 000 aBP以来的植被和气候变化历史。研究结果发现:冰消期早期(15.0~12.5 kaBP)研究区花粉主要来自当地出露的陆架,揭示出出露的陆架植被以热带低山雨林和低地雨林为主。海滨地区生长着茂盛的红树林,当时气温比现在低一些,但无明显变干现象。冰消期后期(12.5~10 kaBP)植被中低山雨林花粉增多,红树植物花粉减少,这说明此时海平面上升,气温也回升,花粉源区变远。全新世时(10 kaBP至今),花粉主要来源于婆罗洲和周围岛屿,植被以低山雨林和海滨红树植物为主,但花粉浓度大幅降低,只有冰消期早期的几分之一和十几分之一,这种花粉浓度降低说明海平面继续上升,研究区距离花粉源区越来越远。全新世中期时为热、湿的气候环境,后期与现今相近。Abstract: In accordance with the high resolution pollen record of the Core SA09-090,which was located in the low latitude of the South China Sea,four pollen zones have been distinguished in an ascending order.Inferred from the pollen composition in each zone,the history of vegetation evolution and climate change since 15 000 aBP was reconstructed.The research result shows that at the early stage of Last deglaciation(15.0~12.5 kaBP),the pollen in the research area mainly came from the emerged continental shelf.The vegetation was mainly composed of tropical low-mountain and lowland rainforests.Mangroves bloomed on the coastal area.The temperature was a little lower than that of today,but there was no clear evidence of aridity. At the late stage of Last deglaciation(12.5~10 kaBP),the amount of pollen from lowland rainforest increased, and the amount of pollen from mangroves decreased.It indicates a sea level rise at that period,and the temperature rose too.The pollen source area was far away.At the Holocene(10 kaBP to present),the concentration of the pollen decreased significantly.They mainly came from the Borneo and the islands around. It means that the sea level kept rising then,and the researched area is even farther away from the pollen source area.It was hot and humid in the mid-Holocene.In the late period of the Holocene,the pollen composition was similar to that at present.
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Key words:
- the South China Sea /
- the low latitude area /
- Last deglaciation /
- sporopollen /
- paleoenvironment
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