Late Pliocene vegetation and climate of Zhangcun region, Shanxi, North China
Late Pliocene vegetation and climate of Zhangcun region, Shanxi, North China
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山西张村地区晚上新世植被与气候
DOI：
10.1111/j.1365-2486.2010.02381.x
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发表时间：
2011-05-01
影响因子：
11.6
通讯作者：
Li, Chengsen
中科院分区：
文献类型：
--
作者：
Qin, Feng;Ferguson, David K.;Li, Chengsen
为了解东亚晚第三纪的气候变化，评价陆间气候差异，根据孢粉资料定量重建了张村地区上新世晚期的植被演替和气候变化，并探讨了中欧与东亚的区域气候差异。山西张村上新世晚期孢粉组合由50科63种孢粉组合组成，其中被子植物占90.2%，裸子植物占9.7%，蕨类植物占0.09%，其它成分占0.02%。四个时期的植被演替随着时间的推移被确认。在第1阶段，针阔混交林占主导地位，气候凉爽干燥。第二阶段的特点是森林扩张，气候温暖湿润。第3期针叶树数量增加，草本植物数量减少，气候变凉干燥。在第4期，森林以针叶树为主，反映了较冷的气候。用共生法估算的7个气候参数和4个时段的数据表明：（1）上新世晚期的气温和降水量都比今天高; (2)晚第三纪，中欧和华北地区的气候总体上呈现出变冷变干的趋势，但年平均气温下降了约10%。华北地区1°C，与约。中新世中期至上新世晚期，中欧气温为7°C。(3)月平均最大降水量的下降可能是夏季风减弱的信号。(4)最冷月平均气温和最低月平均降水量的下降可能与东亚冬季风的加强有关。(5)青藏高原的快速隆升加强了张村地区上新世晚期的气候变冷变干。
To understand the Neogene climatic changes in eastern Asia and evaluate the intercontinental climatic differences, we have quantitatively reconstructed the vegetation successions and climatic changes in the late Pliocene Zhangcun area based on the palynological data and explored the regional climatic differences between central Europe and eastern Asia. The late Pliocene palynological assemblage of Zhangcun, Shanxi was composed of 63 palynomorphs, belonging to 50 families, covering angiosperms (90.2%), gymnosperms (9.7%), ferns (0.09%), and other elements (0.02%). Four periods of vegetation succession over time were recognized. In period 1, a needle‐ and broad‐leaved mixed forest prevailed with a cool and dry climate. Period 2 was characterized by an expansion of forest with a warmer and wetter climate. The number of conifers increased and that of herbs decreased in period 3, and the climate became cool and dry. In period 4, the forest was dominated by conifers and reflecting a cooler climate. The data of seven climatic parameters in general and four periods estimated by the Coexistence Approach suggested that (1) The late Pliocene temperatures and precipitations were higher than today. (2) The Neogene climate of both Central Europe and North China exhibited a general cooling and drying trend although the mean annual temperature dropped by ca. 1 °C in North China, vs. ca. 7 °C in Central Europe from the middle Miocene to the late Pliocene. (3) The decline of the mean maximum monthly precipitation might signal a weakening of the summer monsoon. (4) The decline of both the mean coldest monthly temperature and the mean minimum monthly precipitation might be linked to the strengthening of the winter monsoon in eastern Asia. (5) The rapid uplift of the Tibetan Plateau strengthened the climatic cooling and drying during the late Pliocene of the Zhangcun region.