青藏高原北部孢粉记录的全新世以来环境变化

doi:10.13826/j.cnki.cn65-1103/x.2007.03.013

Abstract

Abstract: Abstract Based on the contrastive analysis of spore-pollen data since Holocene recorded in the same latitude and vertical natural zones Yang Lake deposition Tibetan Autonomous Region Kunlun Rive deposition and Doucuo (Kuhai) Lake deposition Qinghai Province The results in these three regions have been given that (1) Ephedra as dry and desert vegetation the average percents are 7.7 in Yang Lake 4.2 in Kunlun Rive 7.5 in Doucuo (Kuhai) Lake and the datum in Yang Lake is higher than others; (2) Gramineae as humid vegetation the average percents are 1.2 in Yang Lake 4.9 in Kunlun Rive 12.0 in Kuhai Lake increasing gradually from west to east; (3) Artemisia as humid vegetation the average percents are 22.2 in Yang Lake 43.6 in Kunlun Rive 48.8 in Kuhai Lake increasing gradually from west to east; (4) Chenopodiaceae as dry vegetation the average percents are 52.1 in Yang Lake 42.4 in Kunlun Rive 11.5 in Kuhai Lake however decreasing gradually from west to east; (5) Artemisia/Chenopodiaceae(A/C), the average data as environmental changing index are 0.45 in Yang Lake 1.23 in Kunlun Rive 5.59 in Kuhai Lake increasing gradually from west to east and there is higher data scope during 3.0 $\sim 4.3$ ka BP in these two lake sediment profiles then decreasing; (6) Ephedra / Artemisia data are all increased, but the amplitude is different such as 0.45 in Yang Lake 0.34 in Kunlun Rive 0.28 in Kuhai Lake decreasing gradually from west to east These Characteristics have indicated that the dry level decreased gradually from west to east and its evolving tendency is still from west to east including a short wet period in the northern of Qinghai-Tibetan Plateau since Holocene after reconstructing from spore-pollen data of Paleovegetation and Paleoenvironment

Key words: northern of Qinghai-Tibetan Plateau, Holocene, pollen percents, Artemisia / Chenopodiaceae(A/C) data, Ephedra / Artemisia data, environmental changes

CLC Number:

Q914

ZHAO Zhenming, LIU Aimin, PENG Wei, JIWen-hua, LI Rong-she,WANG Yi-zhi, ZHU Ying-tang. Holocene environmental changes of northern Qinghai-Tibetan Plateau based on spore-pollen analysis[J].Arid Land Geography, 2007, 30(3): 381-391.

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Holocene environmental changes of northern Qinghai-Tibetan Plateau based on spore-pollen analysis

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