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首页> 外文期刊>Quaternary International >Mid- to late Holocene vegetation change recorded at a Neolithic site in the Yangtze coastal plain, East China
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Mid- to late Holocene vegetation change recorded at a Neolithic site in the Yangtze coastal plain, East China

机译：中国东部长江沿岸新石器时代遗址记录的中新世晚期植被变化

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There has been an ongoing debate about human impacts on the evolution of the vegetation cover on the Yangtze delta plain dating back to the Neolithic period. In this study, we carried out pollen identification and grain size analysis on two sediment profiles obtained from the Neolithic Guangfulin site in the Yangtze delta. Together with published results of radiocarbon ages, organic elemental chemistry and archaeological findings, we reconstructed the palaeoecological evolution and human activities at the site during the mid- to late Holocene and distinguished between the impacts on vegetation induced by human and hydrological processes. The results show three events of significant reduction in the abundance of arboreal pollen, which occurred at c. 4635, 2000, and 800 cal yr BP, respectively. The first two events were accompanied by an obvious increase in Poaceae pollen, whereas the last one occurred with a sharp increase in the abundance of Brassicaceae pollen. These findings suggest that the reductions in arboreal pollen resulted from deforestation for the expansion of rice cultivation at c. 4635 and 2000 cal yr BP, and expansion of Brassicaceous oil crops c. 800 years ago. The change in cultivation pattern c. 800 years ago was consistent with the increase in population migration from northern China caused by war at that time. The pollen of aquatic plants increased sharply at c. 4500 cal yr BP, which reflected the change in hydrological environment related to sea-level rise at the Yangtze River mouth.
机译：关于人类对新石器时代的长江三角洲植被覆盖演变的影响一直存在争论。在这项研究中，我们对长江三角洲新石器时代广富林遗址获得的两种沉积物剖面进行了花粉鉴定和粒度分析。结合已发表的放射性碳年龄，有机元素化学和考古发现的结果，我们在全新世中期至晚期重建了该地点的古生态演化和人类活动，并区分了人类和水文过程对植被的影响。结果表明，发生在c处的三倍花粉花粉大量减少的事件。 4635、2000和800 cal yr BP。前两个事件伴随着禾本科花粉的明显增加，而最后一个事件发生于十字花科花粉的数量急剧增加。这些发现表明树木的花粉减少是由于森林砍伐造成的。 BP 4635年和2000年，以及十字花科油料作物的扩张c。 800年前。栽培方式的变化c。 800年前与当时战争引起的中国北方人口迁移的增加是一致的。水生植物的花粉在c点急剧增加。 4500 cal BP，反映了与长江口海平面上升有关的水文环境变化。

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