Webbläsaren som du använder stöds inte av denna webbplats. Alla versioner av Internet Explorer stöds inte längre, av oss eller Microsoft (läs mer här: * https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Var god och använd en modern webbläsare för att ta del av denna webbplats, som t.ex. nyaste versioner av Edge, Chrome, Firefox eller Safari osv.

Climate change and Arctic ecosystems: 1. Vegetation changes north of 55 degrees N between the last glacial maximum, mid-Holocene, and present

Författare

  • NH Bigelow
  • LB Brubaker
  • ME Edwards
  • SP Harrison
  • IC Prentice
  • PM Anderson
  • AA Andreev
  • PJ Bartlein
  • Torben Christensen
  • W Cramer
  • JO Kaplan
  • AV Lozhkin
  • NV Matveyeva
  • DF Murray
  • AD McGuire
  • VY Razzhivin
  • JC Ritchie
  • Benjamin Smith
  • DA Walker
  • K Gajewski
  • V Wolf
  • Björn Holmqvist
  • Y Igarashi
  • K Kremenetskii
  • A Paus
  • MFJ Pisaric
  • VS Volkova

Summary, in English

[1] A unified scheme to assign pollen samples to vegetation types was used to reconstruct vegetation patterns north of 55degreesN at the last glacial maximum (LGM) and mid-Holocene (6000 years B. P.). The pollen data set assembled for this purpose represents a comprehensive compilation based on the work of many projects and research groups. Five tundra types (cushion forb tundra, graminoid and forb tundra, prostrate dwarf-shrub tundra, erect dwarf-shrub tundra, and low- and high-shrub tundra) were distinguished and mapped on the basis of modern pollen surface samples. The tundra-forest boundary and the distributions of boreal and temperate forest types today were realistically reconstructed. During the mid-Holocene the tundra-forest boundary was north of its present position in some regions, but the pattern of this shift was strongly asymmetrical around the pole, with the largest northward shift in central Siberia (similar to200 km), little change in Beringia, and a southward shift in Keewatin and Labrador (similar to200 km). Low- and high-shrub tundra extended farther north than today. At the LGM, forests were absent from high latitudes. Graminoid and forb tundra abutted on temperate steppe in northwestern Eurasia while prostrate dwarf-shrub, erect dwarf-shrub, and graminoid and forb tundra formed a mosaic in Beringia. Graminoid and forb tundra is restricted today and does not form a large continuous biome, but the pollen data show that it was far more extensive at the LGM, while low- and high-shrub tundra were greatly reduced, illustrating the potential for climate change to dramatically alter the relative areas occupied by different vegetation types.

Publiceringsår

2003

Språk

Engelska

Publikation/Tidskrift/Serie

Journal of Geophysical Research

Volym

108

Issue

D19

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Physical Geography
  • Geology

Nyckelord

  • biomization
  • mid-Holocene
  • vegetation maps
  • Arctic ecosystems
  • last glacial maximum
  • palaeoclimate

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 2156-2202