坦桑尼亚桑给巴尔Unguja Ukuu近5000年环境变化和人类活动的高分辨率多代理记录

IF 2.3 Q2 GEOSCIENCES, MULTIDISCIPLINARY
Quaternary Pub Date : 2023-03-13 DOI:10.3390/quat6010021
Apichaya Englong, Paramita Punwong, R. Marchant, T. Seelanan, S. Wynne-Jones, P. Chirawatkul
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引用次数: 2

摘要

利用高分辨率多代沉积记录,包括花粉、木炭、微量元素、地层和粒度数据,揭示了坦桑尼亚桑给巴尔Unguja Ukuu红树林生态系统在过去5000年里的环境变化。通过地层和考古数据的比较,探索了过去几千年历史上人类与环境的相互作用。该地区的特点是红树林和海滩的混合,表明至少在公元前3300年,潮汐淹没水平很低。从公元前2750年开始,红树林随着海平面的上升而扩张。根据花粉记录、粒度分析和贝壳碎片的存在,海平面在公元600年至1100年间进一步上升。公元1100年以后,红树林面积减少,背红树林种类增加,表明海平面下降。椰子树在公元1900年以后减少,这反映了最近海平面的上升和可能的开发阶段。谷类花粉在公元1500年左右大量存在,这与葡萄牙人到达桑给巴尔岛和向阿曼殖民过渡的时间一致。岩心顶部的沉积速率表明,Unguja Ukuu的红树林无法跟上目前海平面上升的速度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High-Resolution Multiproxy Record of Environmental Changes and Anthropogenic Activities at Unguja Ukuu, Zanzibar, Tanzania during the Last 5000 Years
A high-resolution multiproxy sedimentary record comprising pollen, charcoal, trace element, stratigraphy and particle size data is used to reveal environmental changes from the mangrove ecosystem at Unguja Ukuu, Zanzibar, Tanzania, over the last 5000 years. Historical human–environment interactions over the last millennia are explored by a comparison of the stratigraphic and archaeological data. The area was characterised by a mixture of mangrove forest and beaches, indicating a low level of tidal inundation to at least 3300 BCE. From 2750 BCE, mangrove forest expanded as the area experienced sea-level rise. Further sea-level rise is recorded between 600 and 1100 CE, indicated by the pollen record, particle size analysis and the presence of shell fragments. After 1100 CE, mangrove forest decreased with back mangrove species increasing, indicating a falling sea level. Cocos nucifera decreased after 1900 CE, which reflects a recent sea-level rise and possibly a phase of exploitation. Cereal pollen shows a high presence at around 1500 CE, which coincided with the arrival of the Portuguese on Zanzibar and the transition to Omani colonisation. The sedimentation rate in the core top indicates that mangroves in Unguja Ukuu cannot keep pace with the current rate of sea-level rise.
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来源期刊
Quaternary
Quaternary GEOSCIENCES, MULTIDISCIPLINARY-
CiteScore
3.30
自引率
4.30%
发文量
44
审稿时长
11 weeks
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