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首页> 外文期刊>Journal of quaternary science: JQS >Middle pleistocene variations in palaeoclimate, palaeoenvironment and vegetation of the las tablas de daimiel national park (Spain)
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Middle pleistocene variations in palaeoclimate, palaeoenvironment and vegetation of the las tablas de daimiel national park (Spain)

机译：拉斯塔布拉斯德戴米埃尔国家公园（西班牙）的古气候，古环境和植被的中更新世变化

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摘要

The Middle Pleistocene palaeoclimate and palaeoenvironment evolution of the Las Tablas de Daimiel wetlands is described using a combination of sedimentology, pollen and δ13C and δ18O isotopic records of Unit B of core LT-199906. This unit mostly contains fluvial and palustrine sediments. U/Th and amino acid racemization (AAR) dating and a comparison of the δ18O curve of Unit B with oceanic records suggests that Unit B spans the period from the end of Marine Isotope Stage (MIS) 10 (340 ka) to the first stages of MIS 7 (ca. 210 ka). MIS 9 was characterised by a regional vegetation dominated by Cupressaceae, with Pinus as a tree element. The water level was high and temperatures were very probably higher than during the Holocene. MIS 8 and the first substages of MIS 7 (7e, 7d and 7c) were dominated by xerophilous steppe vegetation in lowlands (elevations around 610m above sea level) near to the wetland. At higher altitudes, far away from the wetland, there were fewer Pinus than in MIS 9, and a greater presence of warm, temperate and cool climate tree elements. The aquatic system in MIS 9 became shallower, with eutrophication and the accumulation of organic matter occurring; temperatures were similar to or lower than those of the Holocene.
机译：使用沉积学，花粉和LT-199906核心B单元的δ13C和δ18O同位素记录相结合，描述了Las Tablas de Daimiel湿地的中更新世古气候和古环境演化。该单元主要包含河流和palustrine沉积物。 U / Th和氨基酸外消旋化（AAR）日期以及B单元的δ18O曲线与海洋记录的比较表明B单元跨越了从海洋同位素阶段（MIS）10结束（340 ka）到第一阶段的时间段MIS 7（约210 ka）。 MIS 9的特征是以柏科为主导的区域植被，以松属为树元素。水位高，温度很可能比全新世时期高。 MIS 8和MIS 7的第一个子阶段（7e，7d和7c）主要由湿地附近低地（海拔610m左右）的嗜旱草原植被控制。在海拔较高，远离湿地的地方，松树比MIS 9少，并且有更多的温暖，温带和凉爽的气候树元素。 MIS 9的水生系统变得更浅，发生了富营养化和有机物质的积累。温度等于或低于全新世。

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