Modern pollen assemblages from surface lake sediments and their environmental implications on the southwestern Tibetan Plateau

doi:10.1111/bor.12201

	Modern pollen assemblages from surface lake sediments and their environmental implications on the southwestern Tibetan Plateau
	Ma, QF ; Ma, QF (Ma, Qingfeng)1; Zhu, LP (Zhu, Liping)1,2; Lu, XM (Lu, Xinmiao)1,2; Wang, Y (Wang, Yong)1; Guo, Y (Guo, Yun)1; Wang, JB (Wang, Junbo)1,2; Ju, JT (Ju, Jianting)1; Peng, P (Peng, Ping)1; Tang, LY (Tang, Lingyu)3
刊名	BOREAS
	2017
卷号	46 期号:2 页码:242-253
关键词	QAIDAM BASIN QUANTITATIVE RECONSTRUCTION CLIMATE RECONSTRUCTIONS HOLOCENE VEGETATION ALPINE VEGETATION SOURCE AREA CHINA MOUNTAINS LAST MONGOLIA
DOI	10.1111/bor.12201
英文摘要	The relationships amongst modern pollen assemblages, vegetation, climate and human activity are the basis for reconstructing palaeoenvironmental changes using pollen records. It is important to determine these relationships at regional scales due to the development of vegetation under different climatic conditions and human activities. In this paper, we report on an analysis of modern pollen assemblages of 31 surface lake samples from 31 lakes (one sample per lake) on the southwestern Tibetan Plateau where the knowledge of modern pollen and their relationships with vegetation, climate and human activities is insufficient. The region includes five vegetation zones: sub- alpine shrub steppe, alpine steppe, alpine meadow and steppe ecotone, mountain desert and alpine desert. The lakes span a wide range of mean annual precipitation (50- 500 mm) and mean annual temperature (-8 to 6 degrees C). Modern pollen assemblages from our samples mainly consist of herb taxa (Artemisia, Cyperaceae, Poaceae, Chenopodiaceae, etc.) and some tree taxa (Pinus, Fagaceae, Alnus, etc.). The results indicate that modern pollen assemblages are able to reflect the main vegetation distribution. Redundancy analysis for the main pollen types and environmental variables shows that precipitation is the leading factor that influences the pollen distribution in the study area with the first axis capturing 13.7% of the variance in the pollen data set. The Artemisia/ Chenopodiaceae ratio is valid for separating the desert component (< 2) from the steppe and other vegetation zones (> 2) but is unable to distinguish moisture variations. The Artemisia/ Cyperaceae ratio is able to identify meadows (< 1) and steppes (> 1) and can be used as a moisture index on the southwestern Tibetan Plateau. Our results show that an appropriate range is needed for a modern pollen data set in order to perform pollen- based quantitative climate reconstructions in one region. It is essential to perform modern studies before using pollen ratios to reconstruct palaeovegetation and palaeoclimate at a regional scale.
学科主题	自然地理学
WOS研究方向	Physical Geography; Geology
语种	英语
WOS记录号	WOS:000398048200007
内容类型	期刊论文
源URL	[http://ir.itpcas.ac.cn/handle/131C11/8306]
专题	青藏高原研究所_图书馆
通讯作者	Ma, QF
作者单位	1.Chinese Acad Sci, Inst Tibetan Plateau Res ITP, Key Lab Tibetan Environm Changes & Land Surface P, TEL, Beijing 100101, Peoples R China. 2.CAS Ctr Excellence Tibetan Plateau Earth Syst, Beijing 100101, Peoples R China. 3.Chinese Acad Sci, Nanjing Inst Geol & Paleontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China.
推荐引用方式 GB/T 7714	Ma, QF,Ma, QF ,Zhu, LP ,et al. Modern pollen assemblages from surface lake sediments and their environmental implications on the southwestern Tibetan Plateau[J]. BOREAS,2017,46(2):242-253.
APA	Ma, QF.,Ma, QF .,Zhu, LP .,Lu, XM .,Wang, Y .,...&Tang, LY .(2017).Modern pollen assemblages from surface lake sediments and their environmental implications on the southwestern Tibetan Plateau.BOREAS,46(2),242-253.
MLA	Ma, QF,et al."Modern pollen assemblages from surface lake sediments and their environmental implications on the southwestern Tibetan Plateau".BOREAS 46.2(2017):242-253.