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Albert Brangarí

Forskare

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Shifts in Microbial Thermal Traits Mitigate Heat-Induced Carbon Losses in Soils

Författare

  • Albert C Brangarí
  • Melissa A Knorr
  • Serita D Frey
  • Johannes Rousk

Summary, in English

Global warming is expected to transfer carbon from soil organic matter to atmospheric CO
2, with microbial communities playing a crucial role in regulating this exchange. While the immediate impact of temperature on microbial functions is well understood and causes soil carbon losses, the long-term response remains unclear, with losses stabilising over time, reducing the overall effect of chronic warming on soil organic carbon (SOC) stocks. Here, we examined the temperature dependence of microbial respiration and growth after 9 years of +5°C warming in a temperate forest. Using these temperature dependences and field temperature data, we modelled in situ carbon fluxes and changes in SOC stocks. Results showed that the direct effect of temperature initially increased respiration and growth, projecting a potential 31% SOC stock loss if the trend had persisted. However, the gradual optimisation of microbial traits to warming balanced the direct temperature effects, enhanced carbon use efficiency and offset CO
2 emissions. Together, these microbial trait shifts limited the heat-induced SOC loss to 15%, closely aligning with empirical observations. These findings suggest that microbial trait optimisation can moderate carbon emissions, providing a parsimonious mechanistic explanation for observations worldwide and underscoring the need to integrate microbial dynamics into models.

Avdelning/ar

  • Institutionen för naturgeografi och ekosystemvetenskap
  • MERGE: ModElling the Regional and Global Earth system
  • Mikrobiell biogeokemi i Lund
  • Mikrobiologisk ekologi
  • BECC: Biodiversity and Ecosystem services in a Changing Climate
  • Funktionell ekologi

Publiceringsår

2025-11

Språk

Engelska

Publikation/Tidskrift/Serie

Global Change Biology

Volym

31

Avvikelse

11

Dokumenttyp

Artikel i tidskrift

Förlag

Wiley-Blackwell

Ämne

  • Soil Science
  • Physical Geography

Nyckelord

  • Soil Microbiology
  • Soil/chemistry
  • Hot Temperature
  • Carbon/metabolism
  • Global Warming
  • Carbon Cycle
  • Carbon Dioxide/metabolism
  • Forests

Aktiv

Published

Forskningsgrupp

  • Microbial Biogeochemistry in Lund
  • Microbial Ecology

ISBN/ISSN/Övrigt

  • ISSN: 1354-1013