作者简介:戴璐(1981-),男,黑龙江伊春人,副教授,主要从事孢粉学和海洋地质学研究.E-mail:dailu2288@163.com
收稿日期: 2017-09-06
修回日期: 2017-10-27
网络出版日期: 2018-01-10
基金资助
国家自然科学基金面上项目“基于海洋孢粉与植硅体证据的末次冰期以来南海南部的古气候演变研究”(编号:41776063)资助
版权
Was There Savanna Corridor on the Exposed Sunda Shelf During the Last Glacial Period?
First author:Dai Lu(1981-), male, Ningbo City, Zhejiang Province, Associate professor. Research areas include palynology and marine geology.E-mail:dailu2288@163.com
Received date: 2017-09-06
Revised date: 2017-10-27
Online published: 2018-01-10
Supported by
Project supported by the National Natural Science Foundation of China “Research of paleoclimatic evolution in the southern South China Sea since the last glacial period, based on the marine palynological and phytolith evidences”(No.41776063)
Copyright
迄今为止,末次冰期低海平面时南海南部暴露的巽他大陆架被稀树草原或是热带雨林覆盖的问题仍然存有争议。来自于东南亚的孢粉证据表明,末次冰期时南海南部没有出现持续而广泛的草本花粉增多现象,主要的孢粉成分仍为低地雨林和山地雨林。草本花粉占主导的证据多出现在澳大利亚北部,这可能指示了草本植物以现代稀树草原分布区为中心进行扩张。据此,可以认为,尽管末次冰期气候有所变干,但南海南部周边陆地以及暴露的巽他大陆架上可能仍然被热带森林所覆盖。这一推断不仅得到了该区域植被—古气候模拟的支持,也与热带南美洲的很多孢粉证据相对应。通过当前孢粉证据的总结,发现东南亚古植被重建工作存有一些不足,例如海洋孢粉记录数量稀少,缺乏对海洋孢粉组合与内陆植被关系的了解。
戴璐 . 末次冰期时暴露的巽他大陆架可能被热带稀树草原覆盖吗?[J]. 地球科学进展, 2017 , 32(11) : 1147 -1156 . DOI: 10.11867/j.issn.1001-8166.2017.11.1147
To date, it is still heatedly debated that whether the exposed Sunda Shelf was covered by savanna or rainforest in the Last Glacial Period (LGP). A lot of palynological evidences revealed that large increase of non-arboreal pollen did not occurred on the southern South China Sea (SCS), and lowland and montane rainforest pollen were still predominant. Most of the herb-predominated pollen records occurred on the northern Australia, possibly indicating dispersions of herbs from current distribution centers. As a result, we advocated that inland and connected exposed Sunda Shelf around the southern SCS were covered by tropical forests rather than savanna during the LGP, although climate was drier then. This conclusion is not only supported by palaeoclimate-vegetation modeling, but also corresponds with most of the palynological evidences from South America. Current palynological records also showed the lack of palaeoenviromental reconstruction in Southeast Asia, including less pollen records and ambiguous correlations between marine pollen assemblage and its catchment vegetation.
Key words： Last Glacial Period; Sunda shelf; Pollen; Savanna; Vegetation.
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