Late Pleistocene to Holocene vegetation changes in southeastern Patagonia (49° S): landscape changes related to disturbances

IF 1.9 3区 地球科学 Q3 GEOGRAPHY, PHYSICAL
Víctor Merino-Campos, Gonzalo David Sottile, María Eugenia de Porras, Marcela Sandra Tonello
{"title":"Late Pleistocene to Holocene vegetation changes in southeastern Patagonia (49° S): landscape changes related to disturbances","authors":"Víctor Merino-Campos,&nbsp;Gonzalo David Sottile,&nbsp;María Eugenia de Porras,&nbsp;Marcela Sandra Tonello","doi":"10.1002/jqs.3638","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>Southeastern Patagonia's (49° S) post-glacial history inferred from high Andean lake sediments provides new insights regarding Late Pleistocene and Holocene vegetation dynamics at the eastern margin of the Southern Patagonian Icefield. The fossil records of pollen, charcoal and geochemical data from tephra layers from Laguna Chiquita and Laguna Gemelas Este were analysed to reveal past landscape dynamics related to vegetation changes, fire and volcanic events from <i>ca</i>. 15 200 cal a \n<span>bp</span> to the present. <i>Nothofagus</i> forest expanded over shrubland communities sometime between 15 200 and 4600 cal a \n<span>bp</span>, along with at least three disturbance sources related to the volcanic eruptions of Lautaro, Aguilera and Hudson, important local fire episodes, and neoglacial advances. Major charcoal deposition reveals moderate fire activity during the Late Pleistocene related to an open landscape characterised by a grass/shrub steppe. Local glacier advances may have affected the Laguna Gemelas Este sedimentation. Tephra deposition events do not correlate to vegetation changes inferred from the Laguna Gemelas Este and Laguna Chiquita pollen records. Late Holocene eastern Andean forest changes and fire activity at 49° S match other southern palaeoenvironmental records (50–52° S) suggesting that changes in the Southern Westerly Wind latitudinal position and intensity drove major palaeovegetation and fire dynamics before the European settlement. In the last centuries, fire and vegetation changes have been closely related to an increase in local ignition sources and the introduction of alien species.</p>\n </div>","PeriodicalId":16929,"journal":{"name":"Journal of Quaternary Science","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Quaternary Science","FirstCategoryId":"89","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/jqs.3638","RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOGRAPHY, PHYSICAL","Score":null,"Total":0}
引用次数: 0

Abstract

Southeastern Patagonia's (49° S) post-glacial history inferred from high Andean lake sediments provides new insights regarding Late Pleistocene and Holocene vegetation dynamics at the eastern margin of the Southern Patagonian Icefield. The fossil records of pollen, charcoal and geochemical data from tephra layers from Laguna Chiquita and Laguna Gemelas Este were analysed to reveal past landscape dynamics related to vegetation changes, fire and volcanic events from ca. 15 200 cal a bp to the present. Nothofagus forest expanded over shrubland communities sometime between 15 200 and 4600 cal a bp, along with at least three disturbance sources related to the volcanic eruptions of Lautaro, Aguilera and Hudson, important local fire episodes, and neoglacial advances. Major charcoal deposition reveals moderate fire activity during the Late Pleistocene related to an open landscape characterised by a grass/shrub steppe. Local glacier advances may have affected the Laguna Gemelas Este sedimentation. Tephra deposition events do not correlate to vegetation changes inferred from the Laguna Gemelas Este and Laguna Chiquita pollen records. Late Holocene eastern Andean forest changes and fire activity at 49° S match other southern palaeoenvironmental records (50–52° S) suggesting that changes in the Southern Westerly Wind latitudinal position and intensity drove major palaeovegetation and fire dynamics before the European settlement. In the last centuries, fire and vegetation changes have been closely related to an increase in local ignition sources and the introduction of alien species.

巴塔哥尼亚东南部(南纬 49°)晚更新世到全新世的植被变化:与扰动有关的地貌变化
从安第斯高山湖泊沉积物中推断出的巴塔哥尼亚东南部(南纬 49 度)冰川期后的历史,为了解南巴塔哥尼亚冰原东缘晚更新世和全新世植被动态提供了新的视角。通过分析奇基塔湖和埃斯特杰梅拉斯湖化石层的花粉、木炭化石记录和地球化学数据,揭示了从约 15200 卡前至今与植被变化、火灾和火山事件有关的景观动态。从公元前 15200 年到公元前 4600 年的某个时期,在灌木林群落的基础上扩大了胡桃夹竹桃林,同时出现了至少三种干扰源,分别与劳塔罗、阿吉莱拉和哈德逊火山爆发、当地重要的火灾事件以及新冰川期的推进有关。主要的木炭沉积显示,在晚更新世期间,与以草地/灌木草原为特征的开阔地相关的火灾活动较为频繁。当地的冰川运动可能对埃斯特湖沉积产生了影响。根据埃斯特湖和奇基塔湖的花粉记录推断,火山灰沉积事件与植被变化并不相关。南纬 49° 的全新世晚期安第斯东部森林变化和火灾活动与其他南部古环境记录(南纬 50-52°)相吻合,表明在欧洲人定居之前,南西风纬度位置和强度的变化推动了主要的古植被和火灾动态变化。在过去的几个世纪中,火灾和植被的变化与当地火源的增加和外来物种的引入密切相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Journal of Quaternary Science
Journal of Quaternary Science 地学-地球科学综合
CiteScore
4.70
自引率
8.70%
发文量
82
审稿时长
6-12 weeks
期刊介绍: The Journal of Quaternary Science publishes original papers on any field of Quaternary research, and aims to promote a wider appreciation and deeper understanding of the earth''s history during the last 2.58 million years. Papers from a wide range of disciplines appear in JQS including, for example, Archaeology, Botany, Climatology, Geochemistry, Geochronology, Geology, Geomorphology, Geophysics, Glaciology, Limnology, Oceanography, Palaeoceanography, Palaeoclimatology, Palaeoecology, Palaeontology, Soil Science and Zoology. The journal particularly welcomes papers reporting the results of interdisciplinary or multidisciplinary research which are of wide international interest to Quaternary scientists. Short communications and correspondence relating to views and information contained in JQS may also be considered for publication.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信