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2.11～1.49Ma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.
Based on palynological records of the Qangze 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 busbveld 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.
出处
《地质力学学报》
CSCD
2005年第4期320-327,共8页
Journal of Geomechanics
基金
中国地质调查局"青藏高原第三纪重点古湖泊环境演变序列"(200313000066)
"青藏高原生态地质环境遥感调查与监测"(200315100002)项目的阶段性研究成果
关键词
西藏
札达盆地
植被
香孜剖面
孢粉分析
Tibet
Zanda basin
paleovegetation
Qangze section
environment
palynological records
