The effects of an enhanced UV-B radiation on a sub-arctic heath ecosystem

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Standard

The effects of an enhanced UV-B radiation on a sub-arctic heath ecosystem. / Johanson, U; Gehrke, C; Björn, Lars Olof; Callaghan, T V; Sonesson, Mats.

I: Ambio, Vol. 24, Nr. 2, 1995, s. 106-112.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Johanson, U, Gehrke, C, Björn, LO, Callaghan, TV & Sonesson, M 1995, 'The effects of an enhanced UV-B radiation on a sub-arctic heath ecosystem', Ambio, vol. 24, nr. 2, s. 106-112.

APA

CBE

MLA

Vancouver

Author

Johanson, U ; Gehrke, C ; Björn, Lars Olof ; Callaghan, T V ; Sonesson, Mats. / The effects of an enhanced UV-B radiation on a sub-arctic heath ecosystem. I: Ambio. 1995 ; Vol. 24, Nr. 2. s. 106-112.

RIS

TY - JOUR

T1 - The effects of an enhanced UV-B radiation on a sub-arctic heath ecosystem

AU - Johanson, U

AU - Gehrke, C

AU - Björn, Lars Olof

AU - Callaghan, T V

AU - Sonesson, Mats

PY - 1995

Y1 - 1995

N2 - To investigate the effects of increased UV-B radiation on a natural subarctic ecosystem a field irradiation experiment was established at Abisko, northern Sweden. The vegetation in the plots consists of a dwarf shrub layer with mosses and lichens beneath. Many response variables of the vegetation and soil are measured in these plots, e.g. photosynthesis, growth, phenology, changes in species composition and decomposition. This paper describes the methods used and some initial results. Decomposition was imparied by enhanced UV-B radiation. UV-B directly affected decomposition processes and also affected them indirectly by altering the tissue chemistry of leaves. The annual growth of the dwarf shrubs was lower under enhanced UV-B. This was more pronounced in evergreen than in deciduous species. Leaf thickness of the dwarf shrubs was changed by UV-B. The leaves of the evergreen Vaccinium vitis-idaea grew thicker, while those of the two deciduous species V. myrtillus and V. uliginosum grew thinner. In the moss Hylocomium splendens, the phenological development was accelerated under enhanced UV-B radiation. Its growth (number of primary branches, length and dry weight) also increased.

AB - To investigate the effects of increased UV-B radiation on a natural subarctic ecosystem a field irradiation experiment was established at Abisko, northern Sweden. The vegetation in the plots consists of a dwarf shrub layer with mosses and lichens beneath. Many response variables of the vegetation and soil are measured in these plots, e.g. photosynthesis, growth, phenology, changes in species composition and decomposition. This paper describes the methods used and some initial results. Decomposition was imparied by enhanced UV-B radiation. UV-B directly affected decomposition processes and also affected them indirectly by altering the tissue chemistry of leaves. The annual growth of the dwarf shrubs was lower under enhanced UV-B. This was more pronounced in evergreen than in deciduous species. Leaf thickness of the dwarf shrubs was changed by UV-B. The leaves of the evergreen Vaccinium vitis-idaea grew thicker, while those of the two deciduous species V. myrtillus and V. uliginosum grew thinner. In the moss Hylocomium splendens, the phenological development was accelerated under enhanced UV-B radiation. Its growth (number of primary branches, length and dry weight) also increased.

M3 - Article

VL - 24

SP - 106

EP - 112

JO - Ambio

JF - Ambio

SN - 0044-7447

IS - 2

ER -