Herbivore-shrub interactions influence ecosystem respiration and biogenic volatile organic compound composition in the subarctic
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Herbivore-shrub interactions influence ecosystem respiration and biogenic volatile organic compound composition in the subarctic. / Brachmann, Cole G.; Vowles, Tage; Rinnan, Riikka; Björkman, Mats P.; Ekberg, Anna; Björk, Robert G.
I: Biogeosciences, Bind 20, Nr. 19, 2023, s. 4069-4086.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Herbivore-shrub interactions influence ecosystem respiration and biogenic volatile organic compound composition in the subarctic
AU - Brachmann, Cole G.
AU - Vowles, Tage
AU - Rinnan, Riikka
AU - Björkman, Mats P.
AU - Ekberg, Anna
AU - Björk, Robert G.
N1 - Publisher Copyright: © 2023 Cole G. Brachmann et al.
PY - 2023
Y1 - 2023
N2 - Arctic ecosystems are warming nearly 4 times faster than the global average, which is resulting in plant community shifts and subsequent changes in biogeochemical processes such as gaseous fluxes. Additionally, herbivores shape plant communities and thereby may alter the magnitude and composition of ecosystem respiration and biogenic volatile organic compound (BVOC) emissions. Here we determine the effect of large mammalian herbivores on ecosystem respiration and BVOC emissions in two southern and two northern sites in Swedish Scandes, encompassing mountain birch (LOMB) and shrub heath (LORI) communities in the south and low-herb meadow (RIGA) and shrub heath (RIRI) communities in the north. Herbivory significantly altered BVOC composition between sites and decreased ecosystem respiration at RIGA. The difference in graminoid cover was found to have a large effect on ecosystem respiration between sites as RIGA, with the highest cover, had 35 % higher emissions than the next highest-emitting site (LOMB). Additionally, LOMB had the highest emissions of terpenes, with the northern sites having significantly lower emissions. Differences between sites were primarily due to differences in exclosure effects and soil temperature and the prevalence of different shrub growth forms. Our results suggest that herbivory has a significant effect on trace gas fluxes in a productive meadow community and that differences between communities may be driven by differences in shrub composition.
AB - Arctic ecosystems are warming nearly 4 times faster than the global average, which is resulting in plant community shifts and subsequent changes in biogeochemical processes such as gaseous fluxes. Additionally, herbivores shape plant communities and thereby may alter the magnitude and composition of ecosystem respiration and biogenic volatile organic compound (BVOC) emissions. Here we determine the effect of large mammalian herbivores on ecosystem respiration and BVOC emissions in two southern and two northern sites in Swedish Scandes, encompassing mountain birch (LOMB) and shrub heath (LORI) communities in the south and low-herb meadow (RIGA) and shrub heath (RIRI) communities in the north. Herbivory significantly altered BVOC composition between sites and decreased ecosystem respiration at RIGA. The difference in graminoid cover was found to have a large effect on ecosystem respiration between sites as RIGA, with the highest cover, had 35 % higher emissions than the next highest-emitting site (LOMB). Additionally, LOMB had the highest emissions of terpenes, with the northern sites having significantly lower emissions. Differences between sites were primarily due to differences in exclosure effects and soil temperature and the prevalence of different shrub growth forms. Our results suggest that herbivory has a significant effect on trace gas fluxes in a productive meadow community and that differences between communities may be driven by differences in shrub composition.
U2 - 10.5194/bg-20-4069-2023
DO - 10.5194/bg-20-4069-2023
M3 - Journal article
AN - SCOPUS:85177754224
VL - 20
SP - 4069
EP - 4086
JO - Biogeosciences
JF - Biogeosciences
SN - 1726-4170
IS - 19
ER -
ID: 375059725