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Träfflista för sökning "WFRF:(Gavazov Konstantin 1983 ) "

Sökning: WFRF:(Gavazov Konstantin 1983 )

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11.
  • Väisänen, Maria, et al. (författare)
  • The Legacy Effects of Winter Climate on Microbial Functioning After Snowmelt in a Subarctic Tundra
  • 2019
  • Ingår i: Microbial Ecology. - : Springer. - 0095-3628 .- 1432-184X. ; 77:1, s. 186-190
  • Tidskriftsartikel (refereegranskat)abstract
    • Warming-induced increases in microbial CO2 release in northern tundra may positively feedback to climate change. However, shifts in microbial extracellular enzyme activities (EEAs) may alter the impacts of warming over the longer term. We investigated the in situ effects of 3years of winter warming in combination with the in vitro effects of a rapid warming (6days) on microbial CO2 release and EEAs in a subarctic tundra heath after snowmelt in spring. Winter warming did not change microbial CO2 release at ambient (10 degrees C) or at rapidly increased temperatures, i.e., a warm spell (18 degrees C) but induced changes (P<0.1) in the Q(10) of microbial respiration and an oxidative EEA. Thus, although warmer winters may induce legacy effects in microbial temperature acclimation, we found no evidence for changes in potential carbon mineralization after spring thaw.
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12.
  • Walker, Tom W. N., et al. (författare)
  • Lowland plant arrival in alpine ecosystems facilitates a decrease in soil carbon content under experimental climate warming
  • 2022
  • Ingår i: eLIFE. - : eLife Sciences Publications, Ltd. - 2050-084X. ; 11
  • Tidskriftsartikel (refereegranskat)abstract
    • Climate warming is releasing carbon from soils around the world1–3, constituting a positive climate feedback. Warming is also causing species to expand their ranges into new ecosystems4–9. Yet, in most ecosystems, whether range expanding species will amplify or buffer expected soil carbon loss is unknown10. Here we used two whole-community transplant experiments and a follow-up glasshouse experiment to determine whether the establishment of herbaceous lowland plants in alpine ecosystems influences soil carbon content under warming. We found that warming (transplantation to low elevation) led to a negligible decrease in alpine soil carbon content, but its effects became significant and 52% ± 31% (mean ± 95% CIs) larger after lowland plants were introduced at low density into the ecosystem. We present evidence that decreases in soil carbon content likely occurred via lowland plants increasing rates of root exudation, soil microbial respiration and CO2 release under warming. Our findings suggest that warming-induced range expansions of herbaceous plants have the potential to alter climate feedbacks from this system, and that plant range expansions among herbaceous communities may be an overlooked mediator of warming effects on carbon dynamics.
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