Site-specific responses of fungal and bacterial abundances to experimental warming in litter and soil across Arctic and alpine tundra
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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Site-specific responses of fungal and bacterial abundances to experimental warming in litter and soil across Arctic and alpine tundra. / Jeanbille, Mathilde; Clemmensen, Karina; Juhanson, Jaanis; Michelsen, Anders; Cooper, Elisabeth J.; Henry, Greg H.R.; Hofgaard, Annika; Hollister, Robert D.; Jónsdóttir, Ingibjörg S.; Klanderud, Kari; Tolvanen, Anne; Hallin, Sara.
I: Arctic Science, Bind 8, Nr. 3, 2022, s. 992-1005.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Site-specific responses of fungal and bacterial abundances to experimental warming in litter and soil across Arctic and alpine tundra
AU - Jeanbille, Mathilde
AU - Clemmensen, Karina
AU - Juhanson, Jaanis
AU - Michelsen, Anders
AU - Cooper, Elisabeth J.
AU - Henry, Greg H.R.
AU - Hofgaard, Annika
AU - Hollister, Robert D.
AU - Jónsdóttir, Ingibjörg S.
AU - Klanderud, Kari
AU - Tolvanen, Anne
AU - Hallin, Sara
N1 - Publisher Copyright: © Canadian Science Publishing.
PY - 2022
Y1 - 2022
N2 - Vegetation change of the Arctic tundra due to global warming is a well-known process, but the implication for the belowground microbial communities, key in nutrient cycling and decomposition, is poorly understood. We characterized the fungal and bacterial abundances in litter and soil layers across 16 warming experimental sites at 12 circumpolar locations. We investigated the relationship between microbial abundances and nitrogen (N) and carbon (C) isotopic signatures, indicating shifts in microbial processes with warming. Microbial abundances were 2–3 orders of magnitude larger in litter than in soil. Local, site-dependent responses of microbial abundances were variable, and no general effect of warming was detected. The only generalizable trend across sites was a dependence between the warming response ratios and C:N ratio in controls, highlighting a legacy of the vegetation on the microbial response to warming. We detected a positive effect of warming on the litter mass and δ15 N, which was linked to bacterial abundance under warmed condi-tions. This effect was stronger in experimental sites dominated by deciduous shrubs, sug-gesting an altered bacterial N-cycling with increased temperatures, mediated by the vegetation, and with possible consequences on ecosystem feedbacks to climate change.
AB - Vegetation change of the Arctic tundra due to global warming is a well-known process, but the implication for the belowground microbial communities, key in nutrient cycling and decomposition, is poorly understood. We characterized the fungal and bacterial abundances in litter and soil layers across 16 warming experimental sites at 12 circumpolar locations. We investigated the relationship between microbial abundances and nitrogen (N) and carbon (C) isotopic signatures, indicating shifts in microbial processes with warming. Microbial abundances were 2–3 orders of magnitude larger in litter than in soil. Local, site-dependent responses of microbial abundances were variable, and no general effect of warming was detected. The only generalizable trend across sites was a dependence between the warming response ratios and C:N ratio in controls, highlighting a legacy of the vegetation on the microbial response to warming. We detected a positive effect of warming on the litter mass and δ15 N, which was linked to bacterial abundance under warmed condi-tions. This effect was stronger in experimental sites dominated by deciduous shrubs, sug-gesting an altered bacterial N-cycling with increased temperatures, mediated by the vegetation, and with possible consequences on ecosystem feedbacks to climate change.
KW - litter
KW - microbial abundance
KW - soil
KW - stable isotopes
KW - tundra
KW - warming
U2 - 10.1139/as-2020-0053
DO - 10.1139/as-2020-0053
M3 - Journal article
AN - SCOPUS:85114422276
VL - 8
SP - 992
EP - 1005
JO - Arctic Science
JF - Arctic Science
SN - 2368-7460
IS - 3
ER -
ID: 330881061