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首页> 外文期刊>Quaternary International >Paleoenvironments of the last 24,000 years on the extreme northern Rio Grande do Sul coastal plain, southern Brazil
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Paleoenvironments of the last 24,000 years on the extreme northern Rio Grande do Sul coastal plain, southern Brazil

机译：最后24,000年的古环境在极端北Rio Grande Do Sul沿海平原，巴西南部

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摘要

In the northernmost of Rio Grande do Sul coastal plain, southern Brazil, the first comparative palynological study of the sedimentary profiles of two present-day Atlantic rainforests was conducted in Torres municipality: Pirataba forest (29 degrees 15' S, 49 degrees 51' W), 17 km from the coastline, and Faxinal forest (29 degrees 21' S, 49 degrees 45' W), 2 km from the coastline. Ten radiocarbon dates and additional grain influx diagrams allowed for a more accurate analysis. The results suggested that regional and local events affected the northern coastal plain vegetation. The inner coastal plain of the Pirataba site was characterized by a cold, dry regional climate and a small number of pioneer forest species at the end of the last glacial stage (24,000-10,000 BP); a regionally variable temperature increase with slightly humid and dry phases in the early/mid-Holocene (10,000-6700 BP); and regional high temperature and humidity, and expanding Atlantic rainforests, in the mid-Holocene (6700 BP onwards). Near the coastline in the Faxinal site, the following were detected: marine transgression and damage to herbaceous marsh plants, and elevated temperature in the mid-Holocene (7000-6700 BP); regional marine regression, gradual soil desalination and scarce herbaceous marsh in the mid/late Holocene (6700-3500 BP); and regional high temperature and humidity, with forest expansion over the desalinated herbaceous marsh in the late Holocene (3500 BP onwards). The Pirataba and Faxinal forests expanded because of the high temperatures, an even greater increase in regional rainfall, and improved soil conditions at the end of the late Holocene (1500 BP onwards). The hydrosere occurring due to a water reservoir in Faxinal highlights the importance of preserving the lacustrine bodies of the region as generators of coastal forests.
机译：在Rio Grande的最北端，巴西南方苏沿海平原，这是托雷斯市（Torres Municipality）的第一个对比较的腭衰有的沉积曲线研究：Pirataba Forest（29度15'，49度51'W ），距离海岸线17公里，森林（29度21），49度45'W），距离海岸线2公里。十个无线电金日期和额外的谷物流入图允许更准确的分析。结果表明，区域和地方事件影响了北部沿海植被。 Pirataba网站的内部沿海平原在最后的冰川阶段（24,000-10,000 bp）结束时，寒冷，干旱的区域气候和少数先锋林种;在全新月/中旬/中旬/中旬（10,000-6700 bp）中，在区域可变温度升高，略微潮湿和干燥阶段;和区域高温和湿度，并在全新世中，在全新世（6700 BP）中扩大大西洋雨林。在Faxinal遗址的海岸线附近，检测到以下内容：海外违规和损坏草本沼泽植物，中全新世 - 全新世（7000-6700 BP）的高温;区域海洋回归，逐步的土壤脱盐和稀缺于全新世（6700-3500 BP）的草本植物沼泽;和区域高温和湿度，随着森林扩张在延迟全新世（3500 BP）中脱盐草本沼泽。由于气温高，Pirataba和Faxinal森林扩大，区域降雨量较大，延长全新世（1500英镑）的土壤条件提高了甚至更大的土壤条件。由于潮流水库因沿海森林的发电机而导致的流水库因水库而出现的潮湿突出了保护区域的湖泊体。

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