Lowland plant arrival in alpine ecosystems facilitates a decrease in soil carbon content under experimental climate warming - Archive ouverte HAL
Article Dans Une Revue eLife Année : 2022

Lowland plant arrival in alpine ecosystems facilitates a decrease in soil carbon content under experimental climate warming

Tom Walker
  • Fonction : Auteur
Konstantin Gavazov
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Thomas Guillaume
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Thibault Lambert
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Pierre Mariotte
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Devin Routh
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Constant Signarbieux
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Sebastiá Block
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Tamara Münkemüller
Hanna Nomoto
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Thomas W Crowther
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Andreas Richter
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Alexandre Buttler
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Jake Alexander
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Résumé

Climate warming is releasing carbon from soils around the world, constituting a positive climate feedback. Warming is also causing species to expand their ranges into new ecosystems. Yet, in most ecosystems, whether range expanding species will amplify or buffer expected soil carbon loss is unknown. 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% confidence intervals) 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 CO 2 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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Dates et versions

hal-03771643 , version 1 (16-09-2022)

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Tom Walker, Konstantin Gavazov, Thomas Guillaume, Thibault Lambert, Pierre Mariotte, et al.. Lowland plant arrival in alpine ecosystems facilitates a decrease in soil carbon content under experimental climate warming. eLife, 2022, 11, pp.e78555. ⟨10.7554/elife.78555⟩. ⟨hal-03771643⟩
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