Mid- to late Holocene vegetation response to relative sea-level fluctuations recorded by multi-proxy evidence in the Subei Plain, eastern China
Mid- to late Holocene vegetation response to relative sea-level fluctuations recorded by multi-proxy evidence in the Subei Plain, eastern China
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多代理证据记录的中国东部苏北平原全新世中晚期植被对相对海平面波动的响应
DOI：
10.1016/j.palaeo.2022.111327
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发表时间：
2022-11
期刊：
影响因子：
--
通讯作者：
Feng Yuan
中科院分区：
文献类型：
--
作者：
Yu Cheng;Junwu Shu;Shefeng Hao;Bingfei Gao;Xiangqian Li;Feng Yuan
重建全新世区域海平面的变化是有用的，了解未来的海平面情景。本文研究了苏北盆地近6.7ka的沉积学、孢粉、有孔虫和有机质特征。通过将我们的研究结果与考古记录相结合，我们研究了全新世中后期植被对相对海平面波动的反应，并考虑了气候变化对文化发展的影响。在中全新世，盐沼植被（藜科，莎草科和禾本科）的快速和突然的扩张表明海平面的相对上升。从5.7到4.2 cal ka BP，低地沼泽定居的新石器时代的社区，所示的峰值水平的微观木炭和草本花粉物种，如莎草科，香蒲属，狐尾藻，禾本科的显着上升。从4.2 ~ 3.7 cal ka BP，藜科丰度显著增加，δ 13 C值沿着升高，莎草科和禾本科丰度降低，表明4.2 ka气候事件后人类活动显著减少。证据表明，在调查的地区经历了一个相对较高的海平面之间的6.7和6.0 ka，海平面相对下降之间的6.0和5.7 ka，稳定的海平面条件之间的5.7和4.2 ka，并逐渐取代淡水沼泽之间的5.7和4.2 ka。孢粉和δ 13 C记录表明，相对海平面在4.2 ~ 3.7ka之间迅速上升，与4.2ka事件相对应。增强的厄尔尼诺-南方涛动（ENSO）方差和中国东部强烈的气候事件是中晚全新世相对海平面移动的驱动力。相对海平面的上升最终导致了苏北盆地青墩遗址和姜庄遗址的坍塌。我们的研究结果提供了独立的植被证据的相对海平面和气候变化的同时变化。
Reconstructing Holocene changes in regional sea level is useful for understanding future sea-level scenarios. In this paper we examined the sedimentology, pollen, foraminifera, and organic matter properties of a well-dated profile from the Subei Basin that spans the last 6.7 ka. By integrating our findings with the archaeological record, we investigated mid- to late Holocene vegetation responses to relative sea-level fluctuations and considered the impact of climatic variations on cultural development. In the middle Holocene, the rapid and abrupt expansion of salt marsh vegetation (Chenopodiaceae, Cyperaceae, and Poaceae) suggests a relative rise in sea level. From 5.7 to 4.2 cal ka BP, lowland swamps were settled by Neolithic communities, as indicated by peak levels of microscopic charcoal and a significant rise in herbaceous pollen species, such as Cyperaceae,Typha,Myriophyllum, and Poaceae. From 4.2 to 3.7 cal ka BP, a major increase in Chenopodiaceae abundance and a δ13C excursion were observed along with a decrease in Cyperaceae and Poaceae levels, which revealed that human activity significantly decreased following the 4.2 ka climate event. Evidence suggests that the area under investigation experienced a relatively high sea level between 6.7 and 6.0 ka, a relative decrease in sea level between 6.0 and 5.7 ka, a steady sea-level condition between 5.7 and 4.2 ka, and gradual replacement by a freshwater marsh between 5.7 and 4.2 ka. The pollen and δ13C records demonstrate that the relative sea level rose quickly from 4.2 to 3.7 ka, which could correspond to the 4.2 ka event. Enhanced El Niño-Southern Oscillation (ENSO) variance and intense climatic events in eastern China were the driving forces behind the mid-late Holocene relative sea-level shift. The rise in relative sea level eventually led to the collapse of the Qingdun and Jiangzhuang sites in the Subei Basin. Our results provide independent vegetation evidence of the simultaneous changes in relative sea level and variations in climate.
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发表时间：
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期刊：
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