J Integr Plant Biol. ›› 1980, Vol. 22 ›› Issue (4): -.

• Research Articles •    

Vegetational and Climatic Changes in the Past 30,000-10,000 Years in Beijing

Kong Zhao-chen amd Du Nai-qin   

Abstract: This paper is based on the informations of the sporopollen assemblages of 52 samples obtained from the Fenzhuang field outcrop and its drilling core near Zhoukoudian in the vicinity of Beijing. About 30,000 years ago of the Dali glacial period, spruce-fir forests became predominant in the low land and the plain in Beijing. At that time the annual mean temperature was about 7 ℃ lower than that of the present. Based on the characteristics of Fenzbuang sporo-pollen assemblages four zones may be subdivided in ascending order as follows: 1. In the first zone (FⅠ), the herbaceous plants, such as Artemisia, Chenopodiaceae, Gramineae, etc., were predominant. The climate was rather dry and cold. 2. In the second zone (FⅡ), the vegetation during the past 22000–13000 years was dominate of a subalpine conifer forest, consisting of Picea, Abics, Larix, etc., Water plants Myriophyllum, Typha, Sparganium and some members of Cyperaeeae and Green algae, Mougeotia, Zygnema apparently increased. Annual mean temperature was lower than that of the present. The climate was wet with an annual precipitation about 800–1000 mm and cool. 3. In the third zone (FⅢ), the vegetation was represented by a warm temperate forest, predominant of Pinus, Tilia, Selaginella sinensis and Typha. The climate of Beijing was rather wet, with an annual mean precipitation more than that of the present, and warm. The Lakes and bogs were better developed. According to the temperature increasing at this zone, we think the Pleistocene-Holocene boundary should be maked at about 12000 B.P. 4. In the Zone Ⅳ (FⅣ), Tilia was still flourishing and the water plants were better developed at his initial stage but afterwards they were obviously reduced, since 10000 years ago.

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