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A 1.5 Ma sporopollen record of paleoecologic environment evolution in the central Chinese Loess Plateau

机译：黄土高原中部古生态环境演化的1.5 Ma孢粉记录

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摘要

A 1.5 Ma sporopollen record was obtained from a continuous loess-paleosol sequence at Chaona in the central Chinese Loess Plateau. It shows that (1) arid herbs of largely Artemisia and Chenopodiaceae and arbors of mainly Pinus, Betula and Qucrcus dominate loess and paleosol, respectively, reflecting cycles of cold-dry and warm-humid conditions of glaciation and interglaciation; (2) that similar vegetation pattern and cold-dry condition were found in times of unusual thick and coarse loesses L9 and L15, which have been regarded as two extremely cold and dry times as indicated by inorganic climatic proxies; and (3) that shifts of vegetations from earlier forest-steppe to open-forest and steppe and then to steppe were found at 0.95 and 0.5 Ma, implyinga stepwise of drying of the Loess Plateau in the Quaternary.
机译：在中国黄土高原中部的Chauna，从连续的黄土-古土壤序列获得了1.5 Ma的孢粉记录。结果表明：（1）主要是黄蒿和藜科的干旱草本以及主要是松属，桦属和栎属的乔木占主导地位的黄土和古土壤，反映了冰川和冰川间冷干和暖湿条件的循环; （2）在异常厚厚的黄土黄土L9和L15时期发现了相似的植被格局和冷干条件，根据无机气候代理，这被认为是两次极冷和干燥的时期; （3）发现植被从较早的森林草原向开阔的森林草原和草原转变为草原，然后在0.95和0.5 Ma处移动，这意味着第四纪黄土高原的逐步干燥。

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