首页|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?

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?

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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.
Was There Savanna Corridor on the Exposed Sunda Shelf During the Last Glacial Period?
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.

Last Glacial PeriodSunda shelfPollenSavannaVegetation

戴璐、Foong Swee Yeok

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宁波大学地理与空间信息技术系,浙江 宁波315211

School of Biological Sciences, Universiti Sains Malaysia, Malaysia Penang 11960

末次冰期 巽他大陆架 孢粉 热带稀树草原 植被

国家自然科学基金面上项目

41776063

2017

地球科学进展
中国科学院资源环境科学信息中心 国家自然科学基金委员会地球科学部 中国科学院资源环境科学与技术局

地球科学进展

CSTPCDCSCD北大核心
影响因子:2.045
ISSN:1001-8166
年,卷(期):2017.32(11)
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