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Forside

Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Standard

Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum. / Albert, Kristian; Ro-Poulsen, Helge; Mikkelsen, Teis Nørgaard; Bredahl, L.; Haakansson, K.B.

I: Phyton, Bind 45, Nr. 4, 2005, s. 41-49.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

Harvard

Albert, K, Ro-Poulsen, H, Mikkelsen, TN, Bredahl, L & Haakansson, KB 2005, 'Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum.', Phyton, bind 45, nr. 4, s. 41-49.

APA

Albert, K., Ro-Poulsen, H., Mikkelsen, T. N., Bredahl, L., & Haakansson, K. B. (2005). Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum. Phyton, 45(4), 41-49.

Vancouver

Albert K, Ro-Poulsen H, Mikkelsen TN, Bredahl L, Haakansson KB. Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum. Phyton. 2005;45(4):41-49.

Author

Albert, Kristian ; Ro-Poulsen, Helge ; Mikkelsen, Teis Nørgaard ; Bredahl, L. ; Haakansson, K.B. / Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum. I: Phyton. 2005 ; Bind 45, Nr. 4. s. 41-49.

Bibtex

@article{1bf1d58074c311dbbee902004c4f4f50,
title = "Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum.",
abstract = "Effects of reducing the ambient UV-B radiation on gas exchange and chlorophyll fluores-cence of two dwarf shrub species, Salix arctica and Vaccinium uliginosum, was studied in a high arctic heath in North East Greenland during two growing seasons. Films (Mylar, transmitting ¿ > 320 nm, and Lexan, transmitting ¿ > 400 nm) were used to reduce UV-B radiation and UV-B+A respectively. A UV transparent film (Teflon, transmitting ¿ > 280 nm) and no film were used as controls. Field measurements showed that the plants under Teflon, Mylar and Lexan received app. 91{\%}, 39{\%} and 17{\%} of the ambient UV-B irradiance, respectively. UV radiation decreased the maximal photochemical efficiency (Fv/Fm) and other fast fluorescence transient derived parameters in both species, despite an increased level of leaf flavonoid content. The responses varied in signifi-cance according to species and site. The relation of these effects to a significantly decreased stomatal conductance (gs) and intercellular CO2 concentration (Ci) pointed to respiration as an im-portant factor in the interpretation of the observed unaffected net CO2 assimilation (Pn) in UV- re-duced treatments. It is concluded that the studied species have not fully acclimatized to the level of ambient UV-B radiation, and that ambient UV-B level is an important stress factor for the investi-gated plants in High Arctic.",
author = "Kristian Albert and Helge Ro-Poulsen and Mikkelsen, {Teis N{\o}rgaard} and L. Bredahl and K.B. Haakansson",
year = "2005",
language = "English",
volume = "45",
pages = "41--49",
journal = "Phyton. Annales Rei Botanicae",
issn = "0079-2047",
publisher = "Verlag Berger",
number = "4",

}

RIS

TY - JOUR

T1 - Effects of Reducing the Ambient UV-B Radiation in the High Arctic on Salix arctica and Vaccinium uliginosum.

AU - Albert, Kristian

AU - Ro-Poulsen, Helge

AU - Mikkelsen, Teis Nørgaard

AU - Bredahl, L.

AU - Haakansson, K.B.

PY - 2005

Y1 - 2005

N2 - Effects of reducing the ambient UV-B radiation on gas exchange and chlorophyll fluores-cence of two dwarf shrub species, Salix arctica and Vaccinium uliginosum, was studied in a high arctic heath in North East Greenland during two growing seasons. Films (Mylar, transmitting ¿ > 320 nm, and Lexan, transmitting ¿ > 400 nm) were used to reduce UV-B radiation and UV-B+A respectively. A UV transparent film (Teflon, transmitting ¿ > 280 nm) and no film were used as controls. Field measurements showed that the plants under Teflon, Mylar and Lexan received app. 91%, 39% and 17% of the ambient UV-B irradiance, respectively. UV radiation decreased the maximal photochemical efficiency (Fv/Fm) and other fast fluorescence transient derived parameters in both species, despite an increased level of leaf flavonoid content. The responses varied in signifi-cance according to species and site. The relation of these effects to a significantly decreased stomatal conductance (gs) and intercellular CO2 concentration (Ci) pointed to respiration as an im-portant factor in the interpretation of the observed unaffected net CO2 assimilation (Pn) in UV- re-duced treatments. It is concluded that the studied species have not fully acclimatized to the level of ambient UV-B radiation, and that ambient UV-B level is an important stress factor for the investi-gated plants in High Arctic.

AB - Effects of reducing the ambient UV-B radiation on gas exchange and chlorophyll fluores-cence of two dwarf shrub species, Salix arctica and Vaccinium uliginosum, was studied in a high arctic heath in North East Greenland during two growing seasons. Films (Mylar, transmitting ¿ > 320 nm, and Lexan, transmitting ¿ > 400 nm) were used to reduce UV-B radiation and UV-B+A respectively. A UV transparent film (Teflon, transmitting ¿ > 280 nm) and no film were used as controls. Field measurements showed that the plants under Teflon, Mylar and Lexan received app. 91%, 39% and 17% of the ambient UV-B irradiance, respectively. UV radiation decreased the maximal photochemical efficiency (Fv/Fm) and other fast fluorescence transient derived parameters in both species, despite an increased level of leaf flavonoid content. The responses varied in signifi-cance according to species and site. The relation of these effects to a significantly decreased stomatal conductance (gs) and intercellular CO2 concentration (Ci) pointed to respiration as an im-portant factor in the interpretation of the observed unaffected net CO2 assimilation (Pn) in UV- re-duced treatments. It is concluded that the studied species have not fully acclimatized to the level of ambient UV-B radiation, and that ambient UV-B level is an important stress factor for the investi-gated plants in High Arctic.

M3 - Journal article

VL - 45

SP - 41

EP - 49

JO - Phyton. Annales Rei Botanicae

JF - Phyton. Annales Rei Botanicae

SN - 0079-2047

IS - 4

ER -

ID: 86863