孢粉指示鄂陵湖地区晚全新世以来植被与环境演化

Vegetation Indicated by Pollen Records and Climate Evolution in Source Region of the Yellow River since Late Holocene

中文关键词:  鄂陵湖  晚全新世  孢粉分析  植被和环境演变

英文关键词::Erling Lake  Late Holocene  Pollen analysis  Vegetation and environmental evolution

中文摘要:

      通过对黄河源地区鄂陵湖地层剖面的研究,综合分析同一地区不同植被带孢粉代用指标,获得了晚全新世以来鄂陵湖流域植被及气候演变记录。1)1.90~1.60 ka BP,植被类型以高寒草原为主,区域气候干旱寒冷； 2)1.60~0.80 ka BP,为高寒草甸景观,孢粉组合反映出次生植被具有垂直地带性,湖滨地区次生植被为十字花科及紫菀属,而阴坡和山顶区则为紫菀属及蒲公英属,干旱程度有所缓解； 3)0.80 ka BP~,整体景观为莎草、十字花科、蒿属为主的高寒草甸景观,气候转向暖湿,但整体仍较为干旱。其中,0.66~0.84 kaBP出现一次湿润时期,植被丰富。

英文摘要:

      :After studied the stratigraphy in the Erling Lake area and comprehensively analyzed the pollen spectra from different vegetation zone, we gained the vegetation and climate evolution sequence since late Holocene:(1)1.90~1.60 ka BP,the landscape in the area was covered by alpine steppe, regional climate was cold and arid; (2)1.60~0.80 ka BP, the landscape turned to alpine meadow and the pollen combination reflected that secondary vegetation composition appeared vertical vegetation zone, the secondary vegetation composition in lakeside was Brassicaceae and Aster, whereas in shady slopes and mountaintops they were Taraxacum and Aster; (3)0.80 ka BP-, it was Cyperaceae, Cruciferae and Artemisia dominated alpine meadow, as well as in 0.66~0.84 ka BP had appeared a humid period.