New high-resolution pollen records from two lakes in Xizang (Tibet)

Ling Yu Tang, Cai Ming Shen, Kam Biu Liu, Jonathan Overpeck

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Studies on the pollen from cores of Lake Hidden (29°48.77' N, 92°22.37' E) and Ren Co (30°43.97' N, 96°40.97' E) in Southeast Xizang (Tibet) showed climatic changes and the evolution of vegetation since the Last Glacial Maximum (LGM). Before 16 ka BP pollen assemblages were dominated by Chenopodiaceae (20% ~ 50%) and Artemisia (10% ~ 30%) and pollen influx values were very low from Lake Ren Co in Basu county. The vegetation around the lake was probably a desert-steppe during the LGM. The data also suggest that the climate in the Basu area was cold and dry during the LGM and the last glacial time. The mean annual temperature was probably 4 ~ 6 °C colder than the present, and the mean annual precipitation was only 250 mm, about 40% of the present. The Southwest monsoon became stronger from 12 ka BP to 6 ka BP reaching its acme by 7 ka BP, but weakened gradually from 5 ka BP to the present. The paleovegetation was dominantly forest or forest-meadow around Lake Hidden and Ren Co during the 9.2 ~ 5 ka BP. The mean temperature in January was probably 2 ~ 3 °C higher than the present, and the mean annual precipitation was 100 mm more than the present. The timing of vegetational and climatic changes based on pollen records generally supports the results of global climatic-model experiments that predict a strengthened monsoon system during the early to middle Holocene followed by a weakened monsoon system.

Original languageEnglish (US)
Pages (from-to)896-902
Number of pages7
JournalActa Botanica Sinica
Volume41
Issue number8
StatePublished - Aug 1999
Externally publishedYes

Fingerprint

Tibet
Lakes
Pollen
pollen
lakes
China
Chenopodiaceae
climate change
Artemisia
vegetation
Temperature
Amaranthaceae
climate models
Climate
steppes
meadows
deserts
temperature
climate
Experiments

Keywords

  • Paleovegetation and paleoclimate
  • Pollen records
  • South Asia monsoon
  • Southeast Tibet

ASJC Scopus subject areas

  • Plant Science
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

New high-resolution pollen records from two lakes in Xizang (Tibet). / Tang, Ling Yu; Shen, Cai Ming; Liu, Kam Biu; Overpeck, Jonathan.

In: Acta Botanica Sinica, Vol. 41, No. 8, 08.1999, p. 896-902.

Research output: Contribution to journalArticle

Tang, LY, Shen, CM, Liu, KB & Overpeck, J 1999, 'New high-resolution pollen records from two lakes in Xizang (Tibet)', Acta Botanica Sinica, vol. 41, no. 8, pp. 896-902.
Tang, Ling Yu ; Shen, Cai Ming ; Liu, Kam Biu ; Overpeck, Jonathan. / New high-resolution pollen records from two lakes in Xizang (Tibet). In: Acta Botanica Sinica. 1999 ; Vol. 41, No. 8. pp. 896-902.
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