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Modern pollen assemblages from surface lake sediments and their environmental implications on the southwestern Tibetan Plateau
Ma, QF; Zhu, LP; Lu, XM; Wang, Y; Guo, Y; Wang, JB; Ju, JT; Peng, P; Tang, LY (唐领余)
2017-04
Source PublicationBOREAS
ISSN0300-9483
Volume46Issue:2Pages:242-253
Abstract

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.

DOI10.1111/bor.12201
Indexed BySCI
Language英语
WOS Research AreaPhysical Geography ; Geology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary
WOS IDWOS:000398048200007
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/13667
Collection中国科学院南京地质古生物研究所
Affiliation1.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
Recommended Citation
GB/T 7714
Ma, QF,Zhu, LP,Lu, XM,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.,Zhu, LP.,Lu, XM.,Wang, Y.,Guo, 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.
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