Environmental evolution and fire history of Rebun Island (Northern Japan) during the past 17,000 years based on biomarkers and pyrogenic compound records from Lake Kushu
Environmental evolution and fire history of Rebun Island (Northern Japan) during the past 17,000 years based on biomarkers and pyrogenic compound records from Lake Kushu
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DOI：
10.1016/j.quaint.2021.09.015
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发表时间：
2021-09
影响因子：
2.2
通讯作者：
Masanobu Yamamoto;Fangxian Wang;T. Irino;Kazuyoshi Yamada;T. Haraguchi;Hideto Nakamura;K. Gotanda;H. Yonenobu;C. Leipe;Xuan‐Yu Chen;P. Tarasov
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作者：
Masanobu Yamamoto;Fangxian Wang;T. Irino;Kazuyoshi Yamada;T. Haraguchi;Hideto Nakamura;K. Gotanda;H. Yonenobu;C. Leipe;Xuan‐Yu Chen;P. Tarasov
雷本是位于北海道西北部的一个小岛，那里的狩猎-渔民-采集文化传统一直延续到19世纪公元。在这项研究中，我们量化了勒本岛北部库舒湖沉积物中的多环芳烃(PAHs)、五环三萜甲基醚(PTME)、正脂肪酸和甘油二烷基甘油四醚(GDGTs)，以重建过去17000年(即17ka)以来湖泊、当地环境和局部对区域火灾活动的变化。多环芳烃浓度从11千卡增加到10千卡。PAH和PTME的组成表明，这种变化与邻近地点(即库舒湖附近)的火灾活动增加和湖周围生长的草本植物的组成变化有关。多环芳烃浓度在6.6-6.0卡BP的峰值可能表明雷伯恩岛上有强烈的火灾活动。6ka BP以后的多环芳烃组成主要反映了湖泊附近针叶树的燃烧作用。与其余时期相比，GDGTS、n-脂肪酸、perene和PTME浓度在10ka BP左右和6ka BP之后较高，这表明这些化合物在以较低氧气浓度为标志的湖泊条件下保存得更好。
Rebun is a small island located northwest of Hokkaido Island where hunter-fisher-gatherer cultural traditions continued until the 19th century CE. In this study, we quantified polycyclic aromatic hydrocarbons (PAHs), pentacyclic triterpene methyl ethers (PTMEs),n-fatty acids, and glycerol dialkyl glycerol tetraethers (GDGTs) in sediments from Lake Kushu in northern Rebun Island to reconstruct changes in limnology, the local environment and local to regional fire activities during the past 17,000 years (i.e., 17 ka). The PAH concentration increased from 11 to 10 cal ka BP. PAH and PTME compositions indicate that this change was associated with an increase of fire activity at proximal locations (i.e., the vicinity of Lake Kushu) and a change in the composition of grasses growing around the lake. A peak in PAH concentrations at 6.6–6.0 cal ka BP likely indicates intensive fire activity on Rebun Island. The PAH composition after 6 cal ka BP mainly reflected the combustion of conifers near the lake. The GDGTs,n-fatty acids, perylene, and PTME concentrations were higher around 10 cal ka BP and after 6 cal ka BP compared to the remaining periods, suggesting better preservation of those compounds under lake conditions marked by lower oxygen concentrations.