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碳记录显示人类五万年前开始大规模用火
#科学

中科院海洋所研究团队与德法研究人员合作在 PNAS 期刊发表论文,基于海洋沉积物中的黑碳记录,重建了过去 30万 年以来东亚北部的古火演化历史,结合欧洲、东亚、东南亚及澳大利亚区域的记录以及考古遗址大数据,发现现代人类大规模用火始于约 5 万年前。考古学研究发现,人类最早的用火记录可追溯至约 170 万年前。但关于人类究竟何时开始大规模用火,目前仍难以给出确切的答案。黑碳是生物质及化石燃料燃烧过程中所生成的一系列含碳化合物的统称。鉴于其芳香族结构具备高度稳定性,黑碳能够在沉积环境中得以长期留存。以大河作为主要沉积物源区的边缘海,其沉积物中的黑碳很大程度上能够反映大陆尺度的火活动状况。研究认为,5 万年前的冰期,现代人类开启了第二次走出非洲的迁徙历程。冰期海平面下降,印太暖池区大面积的陆架出露为陆地,雨林屏障作用减弱,使得人类在不到一万年的时间里就迅速扩散至东亚、东南亚乃至澳大利亚。人口的急剧扩张极大地促进了用火频率的上升。此外,冰期气候寒冷,食物资源相对匮乏,人类对用火的需求也随之大幅增加。这些因素最终共同促成了 5 万年前成为人类开始大规模用火的关键时间节点。这也进一步表明,人类可能在末次冰期就已经通过用火在全球碳循环演变中留下了深刻印记。
中科院:研究发现现代人类大规模用火始于约5万年前
https://doi.org/10.1073/pnas.2500042122



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碳记录显示人类五万年前开始大规模用火
#科学

中科院海洋所研究团队与德法研究人员合作在 PNAS 期刊发表论文,基于海洋沉积物中的黑碳记录,重建了过去 30万 年以来东亚北部的古火演化历史,结合欧洲、东亚、东南亚及澳大利亚区域的记录以及考古遗址大数据,发现现代人类大规模用火始于约 5 万年前。考古学研究发现,人类最早的用火记录可追溯至约 170 万年前。但关于人类究竟何时开始大规模用火,目前仍难以给出确切的答案。黑碳是生物质及化石燃料燃烧过程中所生成的一系列含碳化合物的统称。鉴于其芳香族结构具备高度稳定性,黑碳能够在沉积环境中得以长期留存。以大河作为主要沉积物源区的边缘海,其沉积物中的黑碳很大程度上能够反映大陆尺度的火活动状况。研究认为,5 万年前的冰期,现代人类开启了第二次走出非洲的迁徙历程。冰期海平面下降,印太暖池区大面积的陆架出露为陆地,雨林屏障作用减弱,使得人类在不到一万年的时间里就迅速扩散至东亚、东南亚乃至澳大利亚。人口的急剧扩张极大地促进了用火频率的上升。此外,冰期气候寒冷,食物资源相对匮乏,人类对用火的需求也随之大幅增加。这些因素最终共同促成了 5 万年前成为人类开始大规模用火的关键时间节点。这也进一步表明,人类可能在末次冰期就已经通过用火在全球碳循环演变中留下了深刻印记。
中科院:研究发现现代人类大规模用火始于约5万年前
https://doi.org/10.1073/pnas.2500042122

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