Dinámica de la vegetación andina del lago Argentino (50° S, 72° O) desde el retiro de los glaciares (ca. 12.000 años cal AP)

IF 0.9 4区 地球科学 Q3 GEOLOGY
G. D. Sottile, M. E. Echeverria, M. S. Tonello, M. A. Marcos, F. Bamonte, Cecilia Rayó, M. Mancini
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引用次数: 3

Abstract

Paleoecological studies in Patagonia provide information about vegetation and climate changes occurred during the Holocene. The climatic evolution of this region offers a unique opportunity to study the environmental variability as well as the ecosystem variations. The dynamic of the forest ecosystems is modulated by the occurrence of disturbances. Fires are one of the most important disturbances in temperate forest ecosystems, and its study allows contrasting independently about the changes experienced by ecosystems. In addition, in Patagonia, environmental and postglacial vegetation changes have been determined by variations in the temperature and westerlies winds. In order to reconstruct changes experienced by the forest ecosystem and patterns of plant diversity during the Holocene, in relation to Postglacial dynamics, natural and anthropic disturbances in the Lake Argentino, pollen and charcoal were studied in a sedimentary sequence at Peninsula Avellaneda. Pollen assemblages suggest non-cyclic changes in plant diversity during the Holocene. The highly diverse cold grass-shrub communities dominated the area up to the Early Holocene, when they were displaced upland by less diverse forest and steppes. Also, The Early and Midd-Holocene was characterized by opposite variations of hydric balance between Andean and extra-andean plant communities present between 48° and 50° S, whereas fire activity occurs synchronously between forest (Andean) and steppe communities (Extra-andean). Late Holocene is characterized by different proxy signals depending on the geographical location of the paleoecological records. To conclude, this work provides a better understanding of the fossil pollen record by its comparison with modern surface pollen samples along an altitudinal vegetation gradient.
自冰川消退(约12000年Cal AP)以来,阿根廷湖(50°S,72°W)的安第斯植被动态
巴塔哥尼亚的古生态研究提供了全新世植被和气候变化的信息。该地区的气候演变为研究环境变化和生态系统变化提供了独特的机会。森林生态系统的动态是由干扰的发生所调节的。火灾是温带森林生态系统中最重要的干扰之一,其研究允许独立对比生态系统所经历的变化。此外,在巴塔哥尼亚,环境和冰川后植被的变化是由温度和西风的变化决定的。为了重建全新世森林生态系统和植物多样性模式的变化,结合冰川后动力学、阿根廷湖的自然和人为干扰,在Avellaneda半岛的沉积序列中研究了花粉和木炭。花粉组合表明全新世植物多样性发生了非周期性变化。直到全新世早期,高度多样化的冷草灌木群落一直主导着该地区,当时它们被不太多样化的森林和草原取代了高地。此外,全新世早期和中期的特征是安第斯和安第斯外植物群落之间的水平衡在48°至50°S之间发生相反的变化,而森林(安第斯)和草原群落(安第斯外)之间的火灾活动同步发生。根据古生态记录的地理位置,晚全新世具有不同的代理信号特征。总之,这项工作通过与沿海拔植被梯度的现代地表花粉样本进行比较,更好地了解了花粉化石记录。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Andean Geology
Andean Geology 地学-地质学
CiteScore
3.90
自引率
0.00%
发文量
17
审稿时长
>12 weeks
期刊介绍: This journal publishes original and review articles on geology and related sciences, in Spanish or English, in three issues a year (January, May and September). Articles or notes on major topics of broad interest in Earth Sciences dealing with the geology of South and Central America and Antarctica, and particularly of the Andes, are welcomed. The journal is interested in publishing thematic sets of papers and accepts articles dealing with systematic Paleontology only if their main focus is the chronostratigraphical, paleoecological and/or paleogeographical importance of the taxa described therein.
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