J Integr Plant Biol. ›› 1991, Vol. 33 ›› Issue (6): -.
• Research Articles •
Wu Yu-shu, Chen Yin-shuo and Xiao Jia-yi
Abstract: This paper presents results of pollen analysis on sediments of core Cao 2 from Dianchi Lake. Four pollen zones are defined, namely zone I, which is further divided into four subzones, zone Ⅱ, zone Ⅲ and zone Ⅳ. Zone Ⅰ(ca. 47600–11800 yrs B. P.) is characterized by low land pollen sedimentation rates and constant presence of Abies pollen. In zone Ⅱ (ca. 11800–6900 yrs B. P.) broad-leaved tree pollen increases and Abies pollen gradually disappears. In zone Ⅲ (ca. 6900–3800 yrs B. P.) evergreen broad-leaved-tree pollen and total land pollen influx reach their maximum values while, Tsuga pollen decreases. Zone Ⅳ shows a great decreases in pollen influx of various pollen types and a increase in Monolete psilate spores. In the past 40000 years vegetation in this area trend changes from a dominantion of coniferous tree to an evergreen broad-leaved forest, co-existing or mixing deciduous broadleaved forest and coniferous forest. In the past 3800 years, due to climate changes and / or human activities, the vegetation cover in this area has been greatly reduced. The above vegetation changes indicate a climate change process from cool and humid, to warm and humid and finally to mild and dry.
Key words: Dianchi Lake, Late Pleistocene, Holocene, Pollen analysis
Wu Yu-shu, Chen Yin-shuo and Xiao Jia-yi. A Preliminary Study on Vegetation and Climate Changes in Dianchi Lake Area in the Last 40000 Years[J]. J Integr Plant Biol., 1991, 33(6): -.
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