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Stratospheric ozone depletion: High arctic tundra plant growth on Svalbard is not affected by enhanced UV-B after 7 years of UV-B supplementation in the field

Författare:
  • Jelte Rozema
  • Peter Boelen
  • Bjorn Solheim
  • Matthias Zielke
  • Alwin Buskens
  • Marieke Doorenbosch
  • Ruben Fijn
  • Jelger Herder
  • Terry Callaghan
  • Lars Olof Björn (Professor emeritus)
  • Dylan Gwynn Jones
  • Rob Broekman
  • Peter Blokker
  • Willem van de Poll
Publiceringsår: 2006
Språk: Engelska
Sidor: 121-135
Publikation/Tidskrift/Serie: PLANT ECOLOGY
Volym: 182
Nummer: 1-2
Dokumenttyp: Artikel
Förlag: SPRINGER

Sammanfattning

The response of tundra plants to enhanced UV-B radiation simulating 15 and 30% ozone depletion was studied at two high arctic sites (Isdammen and Adventdalen, 78 degrees N, Svalbard).The set-up of the UV-B supplementation systems is described, consisting of large and small UV lamp arrays, installed in 1996 and 2002. After 7 years of exposure to enhanced UV-B radiation, plant cover, density, morphological (leaf fresh and dry weight, leaf thickness, leaf area, reproductive and ecophysiological parameters leaf UV-B absorbance, leaf phenolic content, leaf water content) were not affected by enhanced UV-B radiation. DNA damage in the leaves was not increased with enhanced UV-B in Salix polaris and Cassiope tetragona. DNA damage in Salix polaris leaves was higher than in leaves of C. tetragona. The length of male gametophyte moss plants of Polytrichum hyperboreum was reduced with elevated UV-B as well as the number of Pedicularis hirsuta plants per plot, but the inflorescence length of Bistorta vivipara was not significantly affected. We discuss the possible causes of tolerance of tundra plants to UV-B (absence of response to enhanced UV-B) in terms of methodology (supplementation versus exclusion), ecophysiological adaptations to UV-B and the biogeographical history of polar plants.

Disputation

Nyckelord

  • Earth and Environmental Sciences
  • gametophyte
  • inflorescence
  • leaf area
  • ozone depletion
  • Pedicularis hirsuta
  • plant density
  • Polytrichum hyperboreum
  • Salix
  • polaris
  • ultraviolet-b radiation
  • tundra
  • thickness
  • Sanionia uncinata
  • supplementation
  • Cassiope tetragona
  • Arctic
  • Bistorta vivipara
  • Dryas
  • DNA-damage
  • cover
  • octopetala

Övriga

Published
  • Photobiology
Yes
  • Photobiology
  • ISSN: 1385-0237

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