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Long-term changes in the daytime growing season carbon dioxide exchange following increased temperature and snow cover in arctic tundra.
Hermesdorf, Lena; Liu, Yijing; Michelsen, Anders; Westergaard-Nielsen, Andreas; Mortensen, Louise Hindborg; Jepsen, Malte Skov; Sigsgaard, Charlotte; Elberling, Bo.
Afiliación
  • Hermesdorf L; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
  • Liu Y; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
  • Michelsen A; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
  • Westergaard-Nielsen A; Department of Biology, University of Copenhagen, Copenhagen, Denmark.
  • Mortensen LH; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
  • Jepsen MS; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
  • Sigsgaard C; Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark.
  • Elberling B; National Museum of Denmark, Environmental Archaeology and Materials Science, Kongens Lyngby, Denmark.
Glob Chang Biol ; 30(1): e17087, 2024 Jan.
Article en En | MEDLINE | ID: mdl-38273494
ABSTRACT
Increasing temperatures and winter precipitation can influence the carbon (C) exchange rates in arctic ecosystems. Feedbacks can be both positive and negative, but the net effects are unclear and expected to vary strongly across the Arctic. There is a lack of understanding of the combined effects of increased summer warming and winter precipitation on the C balance in these ecosystems. Here we assess the short-term (1-3 years) and long-term (5-8 years) effects of increased snow depth (snow fences) (on average + 70 cm) and warming (open top chambers; 1-3°C increase) and the combination in a factorial design on all key components of the daytime carbon dioxide (CO2 ) fluxes in a wide-spread heath tundra ecosystem in West Greenland. The warming treatment increased ecosystem respiration (ER) on a short- and long-term basis, while gross ecosystem photosynthesis (GEP) was only increased in the long term. Despite the difference in the timing of responses of ER and GEP to the warming treatment, the net ecosystem exchange (NEE) of CO2 was unaffected in the short term and in the long term. Although the structural equation model (SEM) indicates a direct relationship between seasonal accumulated snow depth and ER and GEP, there were no significant effects of the snow addition treatment on ER or GEP measured over the summer period. The combination of warming and snow addition turned the plots into net daytime CO2 sources during the growing season. Interestingly, despite no significant changes in air temperature during the snow-free time during the experiment, control plots as well as warming plots revealed significantly higher ER and GEP in the long term compared to the short term. This was in line with the satellite-derived time-integrated normalized difference vegetation index of the study area, suggesting that more factors than air temperature are drivers for changes in arctic tundra ecosystems.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dióxido de Carbono / Ecosistema Tipo de estudio: Prognostic_studies Idioma: En Revista: Glob Chang Biol Año: 2024 Tipo del documento: Article País de afiliación: Dinamarca Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dióxido de Carbono / Ecosistema Tipo de estudio: Prognostic_studies Idioma: En Revista: Glob Chang Biol Año: 2024 Tipo del documento: Article País de afiliación: Dinamarca Pais de publicación: Reino Unido