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The Holocene Cedrus pollen record from Sierra Nevada (S Spain), a proxy for climate change in N Africa
Quaternary Science Reviews ( IF 4 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.quascirev.2020.106468
Gonzalo Jiménez-Moreno , R. Scott Anderson , María J. Ramos-Román , Jon Camuera , Jose Manuel Mesa-Fernández , Antonio García-Alix , Francisco J. Jiménez-Espejo , José S. Carrión , Alejandro López-Avilés

Abstract Comprehending the effects of climate variability and disturbance on forested ecosystems is paramount to successfully managing forest environments under future climate scenarios (e.g., global warming, aridification increase). Changes in fossil pollen abundance in sedimentary archives record past vegetation dynamics at regional scales, mainly related to climate changes and, in the last few millennia, to human impact. Pollen records can thus provide long databases with information on how the environment reacted to climate change before the historical record. In this study, we synthesized fossil pollen data from seven sites from the Sierra Nevada in southern Spain to investigate the response of forests in the western Mediterranean area to millennial-scale climate changes and to human impact during the Holocene. In particular, here we focused on Cedrus pollen abundances, which most-likely originated from Northern Africa and were carried to Sierra Nevada by wind. Cedrus pollen has received little attention in the Iberian Peninsula palynological records, for it occurs in low concentrations and has an African source, and thus this article explores the potential to reconstruct its past history and climate. Although Cedrus abundances are generally lower than 1% in the studied pollen samples, a comparison with North African (Moroccan) Cedrus pollen records shows similar trends at long- and short-term time-scales. Therefore, this record could be used as a proxy for changes in this forest species in North Africa. As observed in the Sierra Nevada synthetic record, the increasing trend of Cedrus pollen during the Middle and Late Holocene closely correlates with decreasing summer insolation. This would have produced overall cooler annual temperatures in Northern Africa (Middle Atlas and Rif Mountains) as well as lower summer evaporation, benefiting the growth of this cool-adapted montane tree species while increasing available moisture during the summer, which is critical for this water-demanding species. Millennial-scale variability also characterizes the Sierra Nevada Cedrus synthetic pollen record. Cedrus abundance oscillations co-vary with well-known millennial-scale climatic variability that controlled cedar abundance and altitudinal distribution in montane areas of N Africa.

中文翻译:

内华达山脉(西班牙南部)的全新世雪松花粉记录,代表北非气候变化

摘要 理解气候变异和干扰对森林生态系统的影响对于在未来气候情景(例如全球变暖、干旱加剧)下成功管理森林环境至关重要。沉积档案中化石花粉丰度的变化记录了区域尺度上过去的植被动态,主要与气候变化有关,并且在过去的几千年中与人类的影响有关。因此,花粉记录可以为长数据库提供有关历史记录之前环境如何对气候变化做出反应的信息。在这项研究中,我们合成了来自西班牙南部内华达山脉的七个地点的化石花粉数据,以研究地中海西部地区的森林对千年尺度气候变化和全新世人类影响的反应。特别是,在这里,我们专注于雪松花粉的丰度,它们很可能来自北非,并被风带到内华达山脉。雪松花粉在伊比利亚半岛孢粉学记录中很少受到关注,因为它的浓度很低,并且来自非洲,因此本文探讨了重建其过去历史和气候的潜力。尽管在研究的花粉样本中雪松丰度通常低于 1%,但与北非(摩洛哥)雪松花粉记录的比较显示出长期和短期时间尺度上的相似趋势。因此,该记录可用作北非森林物种变化的代表。正如在内华达山脉的合成记录中所观察到的那样,全新世中晚期雪松花粉的增加趋势与夏季日照减少密切相关。这将使北非(中阿特拉斯山脉和里夫山脉)的全年气温总体较低,夏季蒸发量降低,有利于这种适应凉爽的山地树种的生长,同时增加夏季的可用水分,这对这种水至关重要- 要求苛刻的物种。千禧年尺度的变异性也是内华达山脉雪松合成花粉记录的特征。雪松丰度振荡与众所周知的千年尺度气候变化共同变化,后者控制着北非山地地区的雪松丰度和海拔分布。这将使北非(中阿特拉斯山脉和里夫山脉)的全年气温总体较低,夏季蒸发量降低,有利于这种适应凉爽的山地树种的生长,同时增加夏季的可用水分,这对这种水至关重要- 要求苛刻的物种。千禧年尺度的变异性也是内华达山脉雪松合成花粉记录的特征。雪松丰度振荡与众所周知的千年尺度气候变化共同变化,后者控制着北非山地地区的雪松丰度和海拔分布。这将使北非(中阿特拉斯山脉和里夫山脉)的全年气温总体较低,夏季蒸发量降低,有利于这种适应凉爽的山地树种的生长,同时增加夏季的可用水分,这对这种水至关重要- 要求苛刻的物种。千禧年尺度的变异性也是内华达山脉雪松合成花粉记录的特征。雪松丰度振荡与众所周知的千年尺度气候变化共同变化,后者控制着北非山地地区的雪松丰度和海拔分布。千禧年尺度的变异性也是内华达山脉雪松合成花粉记录的特征。雪松丰度振荡与众所周知的千年尺度气候变化共同变化,后者控制着北非山地地区的雪松丰度和海拔分布。千禧年尺度的变异性也是内华达山脉雪松合成花粉记录的特征。雪松丰度振荡与众所周知的千年尺度气候变化共同变化,后者控制着北非山地地区的雪松丰度和海拔分布。
更新日期:2020-08-01
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