Ecotone Shift and Major Droughts During the Mid-late Holocene in the Central Tibetan Plateau

A well-dated pollen record from a large lake located on the meadow—steppe ecotone provides a history of ecotone shift in response to monsoonal climate changes over the last 6000 years in the central Tibetan Plateau. The pollen record indicates that the ecotone shifted eastward during 6000—4900, 4400...

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Published in:Ecology (Durham) 2008-04, Vol.89 (4), p.1079-1088
Main Authors: Shen, C, Liu, K.B, Morrill, C, Overpeck, J.T, Peng, J, Tang, L
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Climate
Climate change
Disasters
Drought
Ecosystem
ecotone
Ecotones
Fresh Water
Fresh water ecosystems
Fundamental and applied biological sciences. Psychology
General aspects
Geological time
Grasslands
history
Holocene
lake
meadow
Meadows
monsoon
Monsoons
Paleoclimatology
paleoecology
Paleontology
Pollen
precipitation
Sediments
steppe
Steppes
Synecology
Tibet
Tibetan Plateau
Time Factors
Vegetation
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container_end_page 1088
container_issue 4
container_start_page 1079
container_title Ecology (Durham)
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creator Shen, C
Liu, K.B
Morrill, C
Overpeck, J.T
Peng, J
Tang, L
description A well-dated pollen record from a large lake located on the meadow—steppe ecotone provides a history of ecotone shift in response to monsoonal climate changes over the last 6000 years in the central Tibetan Plateau. The pollen record indicates that the ecotone shifted eastward during 6000—4900, 4400—3900, and 2800—1600 cal. yr BP when steppes occupied this region, whereas it shifted westward during the other intervals when the steppes were replaced by meadows. The quantitative reconstruction of paleoclimate derived from the pollen record shows that monsoon precipitation fluctuated around the present level over the last 6000 years in the central Tibetan Plateau. Three major drought episodes of 5600—4900, 4400—3900, and 2800—2400 cal. yr BP are detected by pollen signals and lake sediments. Comparison of our record with other climatic proxy data from the Tibetan Plateau and other monsoonal regions shows that these episodes are three major centennial-scale monsoon weakening events.
doi_str_mv 10.1890/06-2016.1
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The pollen record indicates that the ecotone shifted eastward during 6000—4900, 4400—3900, and 2800—1600 cal. yr BP when steppes occupied this region, whereas it shifted westward during the other intervals when the steppes were replaced by meadows. The quantitative reconstruction of paleoclimate derived from the pollen record shows that monsoon precipitation fluctuated around the present level over the last 6000 years in the central Tibetan Plateau. Three major drought episodes of 5600—4900, 4400—3900, and 2800—2400 cal. yr BP are detected by pollen signals and lake sediments. Comparison of our record with other climatic proxy data from the Tibetan Plateau and other monsoonal regions shows that these episodes are three major centennial-scale monsoon weakening events.</abstract><cop>Washington, DC</cop><pub>Ecological Society of America</pub><pmid>18481532</pmid><doi>10.1890/06-2016.1</doi><tpages>10</tpages></addata></record>
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source Wiley; JSTOR Archival Journals and Primary Sources Collection
subjects Animal and plant ecology
Animal, plant and microbial ecology
Biological and medical sciences
Climate
Climate change
Disasters
Drought
Ecosystem
ecotone
Ecotones
Fresh Water
Fresh water ecosystems
Fundamental and applied biological sciences. Psychology
General aspects
Geological time
Grasslands
history
Holocene
lake
meadow
Meadows
monsoon
Monsoons
Paleoclimatology
paleoecology
Paleontology
Pollen
precipitation
Sediments
steppe
Steppes
Synecology
Tibet
Tibetan Plateau
Time Factors
Vegetation
title Ecotone Shift and Major Droughts During the Mid-late Holocene in the Central Tibetan Plateau
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