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Holocene environmental changes in Bangong Co basin (western Tibet) .2. The pollen record
VanCampo, E; Cour, P; Hang, SX
1996-02-01
Source PublicationPALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
ISSN0031-0182
Volume120Issue:1-2Pages:49-63
Corresponding AuthorVanCampo, E()
AbstractA better knowledge of environmental variations in key regions such as the Tibetan plateau, which plays a fundamental role in the Indian monsoon dynamics and thus on the whole Northern Hemisphere atmospheric circulation, is of great importance. We present here a detailed paleoenvironmental study based on pollen analyses of a sediment core from Lake Bangong. Results on the modern pollen rain are also discussed as they give valuable information for the interpretation of the fossil pollen data. The pollen results of the Bangong sequence and their paleoclimatic interpretation are integrated into a chronological framework on the basis of palynostratigraphical methods. Because of dead carbon in the lake system, it has been difficult to establish a reliable chronology of the Bangong sequence. Using a geochemical model for correcting measured C-14 ages, the pollen record from Lake Bangong compares well with the record from Lake Sumxi in Western Tibet. Lake Bangong core provides a continuous Holocene pollen record. Before 9600 yr B.P., the dominance of desertic elements in the pollen record reflects an arid environment. At about 9600 yr B.P., an abrupt shift to steppe vegetation suggests the onset of moister conditions, and from approximate to 9500 to 6200 yr B.P., proxy data indicate conditions warmer and wetter than today. Proxy data also indicate short-term changes during this interval. Climate instability is suggested by the development of a local palustral flora, which peaks at 7700 yr B.P. and is interpreted as a lake regression, in phase with increase in the percentage of littoral and saline water diatom species between 8600 and 7700 yr B.P. The first humid pulse culminating at 9000-8500 yr B.P. is thus followed by drier conditions around 8000-7700 yr B.P. The interval between 7200 and 6500 yr B.P., regarded as optimal for vegetation growth from the pollen record, corresponds to a second humid pulse. A trend towards aridity is observed during the following period with dry events centered around 5500, 3900-3200 and 700 yr B.P.
Indexed BySCI
Language英语
WOS Research AreaPhysical Geography ; Geology ; Paleontology
WOS SubjectGeography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS IDWOS:A1996UA85400004
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/56672
Collection中国科学院地理科学与资源研究所
Corresponding AuthorVanCampo, E
Affiliation1.UNIV PARIS 11,LHGI,CNRS,GDR 970,F-91405 ORSAY,FRANCE
2.UNIV MONTPELLIER 2,LAB PALYNOL & PALEOENVIRONM,CNRS,URA 723,F-34095 MONTPELLIER 5,FRANCE
3.CHINESE ACAD SCI,INST GEOG,BEIJING 100012,PEOPLES R CHINA
Recommended Citation
GB/T 7714
VanCampo, E,Cour, P,Hang, SX. Holocene environmental changes in Bangong Co basin (western Tibet) .2. The pollen record[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,1996,120(1-2):49-63.
APA VanCampo, E,Cour, P,&Hang, SX.(1996).Holocene environmental changes in Bangong Co basin (western Tibet) .2. The pollen record.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,120(1-2),49-63.
MLA VanCampo, E,et al."Holocene environmental changes in Bangong Co basin (western Tibet) .2. The pollen record".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 120.1-2(1996):49-63.
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