摘要:
通过对西藏阿里札达盆地香孜剖面的孢粉分析,初步定出该地区新近纪和第四纪的界线,并得到更新世晚期以来该地区植被与环境发展的历史.约在2.68~2.45Ma期间,植被以乔木为主,主要为松、藜、蒿,属山地寒温气候;约在2.45~2.11Ma期间,草本植物迅速上升,气候变得干旱寒冷,显示出灌木草原气候特征;在2.11~1.49 Ma期间,草本植物数量和种类达到之最,灌木相对增加,也显示气候进一步趋于干旱;在1.49~1.36Ma期间,草本植物有小幅下降,但蕨类植物增加幅度较大,显示了干冷草原气候特征.
关键词:
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西藏
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札达盆地
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植被
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香孜剖面
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孢粉分析
Abstract:
Based on palynological records of the Qangzê section in Zanda basin,Ngari,Tibet,the authors have preliminarily defined the Neogene-Quaternary boundary in the area and revealed the vegetational and environmental history of the area since the late Pleistocene.During~2.68-2.45 Ma,the vegetation was dominated by arbores,mainly Pinus,Chenopodiaceae and Artemisia,indicating a cold warm climate in the mountain region.During~2.45-2.11 Ma,herbs increased rapidly and the climate became dry-cold,indicating the characteristic of the bushveld climate.During 2.11-1.49 Ma,the quantity and species of the herbs reached the culmination and the bush increased accordingly,showing that the climate became more and more arid.During 1.49-1.36 Ma,herbs declined slightly but pteridophytes increased relatively greatly,revealing a dry-cold grassland climate.
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