Evidence of dry and cold climatic conditions at glacial times in tropical southeastern Brazil
Evidence of dry and cold climatic conditions at glacial times in tropical southeastern Brazil
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DOI：
10.1006/qres.1997.1932
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发表时间：
1997-11-01
影响因子：
2.3
通讯作者：
Lichte, M
中科院分区：
文献类型：
--
作者：
Behling, H;Lichte, M
末次冰期的古环境已经从有机沉积物中分析的花粉和木炭记录中重建出来，并定年在公元前200年至公元前200年之间。18.000和> 48，000 C-14 yr B. P.该遗址位于巴西东南部低高原地区的Catas Altas村附近，末次冰期景观被大面积的亚热带草原和河流沿着的小面积画廊森林覆盖，今天存在热带半落叶林和塞拉多生态系统。亚热带廊道林主要由南洋杉属乔木如狭叶南洋杉、竹柏、冬青、山矾等组成。古火频繁。记录表明，亚热带草原植被，今天在巴西南部的高地上发现的斑块，（特别是在圣卡塔里纳州），从巴西南部扩展到巴西东南部，超过750公里的距离，从南纬约28度到至少南纬20度，完全不同的末次冰期环境，与现在的环境相比反映了干燥寒冷的气候，冬季有强烈的霜冻，推断末次冰期的气温比现在低5 -7摄氏度。(C)1997年华盛顿大学。
Last-glacial paleoenvironments have been reconstructed from a pollen and charcoal record analyzed in organic sediments and dated between ca. 18.000 and >48,000 C-14 yr B.P. The site is located near the village Catas Altas in the lower highland region of southeastern Brazil, The last-glacial landscape was covered by extensive areas of subtropical grasslands and small areas of gallery forests along the rivers, where tropical semideciduous forests and cerrado ecosystems exist today. The subtropical gallery forests were composed of Araucaria forest trees such as Araucaria angustifolia, Podocarpus, Drimys, Ilex, and Symplocos. Paleofires were frequent. The record indicates that subtropical grassland vegetation, which today is found in patches on the highlands in southern Brazil (especially in the state of Santa Catarina), expanded from southern Brazil to southeastern Brazil, over a distance of more than 750 km, from latitudes of about 28 degrees S to at least 20 degrees S, The completely different last-glacial environment, in comparison to the present-day environment, reflects a dry and cold climate with strong frosts during the winter months, Temperatures of 5 degrees-7 degrees C below those of the present are inferred for the last glaciation. (C) 1997 University of Washington.