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Variable influence of photosynthetic thermal acclimation on future carbon uptake in Australian wooded ecosystems under climate change.
Bennett, Alison C; Knauer, Jürgen; Bennett, Lauren T; Haverd, Vanessa; Arndt, Stefan K.
Afiliación
  • Bennett AC; School of Agriculture, Food and Ecosystem Sciences, University of Melbourne, Richmond, Victoria, Australia.
  • Knauer J; CSIRO, Environment, Aspendale, Victoria, Australia.
  • Bennett LT; CSIRO, Oceans and Atmosphere, Canberra, Australian Capital Territory, Australia.
  • Haverd V; Hawkesbury Institute for the Environment, Western Sydney University, Richmond, New South Wales, Australia.
  • Arndt SK; School of Agriculture, Food and Ecosystem Sciences, University of Melbourne, Creswick, Victoria, Australia.
Glob Chang Biol ; 30(1): e17021, 2024 Jan.
Article en En | MEDLINE | ID: mdl-37962105
Climate change will impact gross primary productivity (GPP), net primary productivity (NPP), and carbon storage in wooded ecosystems. The extent of change will be influenced by thermal acclimation of photosynthesis-the ability of plants to adjust net photosynthetic rates in response to growth temperatures-yet regional differences in acclimation effects among wooded ecosystems is currently unknown. We examined the effects of changing climate on 17 Australian wooded ecosystems with and without the effects of thermal acclimation of C3 photosynthesis. Ecosystems were drawn from five ecoregions (tropical savanna, tropical forest, Mediterranean woodlands, temperate woodlands, and temperate forests) that span Australia's climatic range. We used the CABLE-POP land surface model adapted with thermal acclimation functions and forced with HadGEM2-ES climate projections from RCP8.5. For each site and ecoregion we examined (a) effects of climate change on GPP, NPP, and live tree carbon storage; and (b) impacts of thermal acclimation of photosynthesis on simulated changes. Between the end of the historical (1976-2005) and projected (2070-2099) periods simulated annual carbon uptake increased in the majority of ecosystems by 26.1%-63.3% for GPP and 15%-61.5% for NPP. Thermal acclimation of photosynthesis further increased GPP and NPP in tropical savannas by 27.2% and 22.4% and by 11% and 10.1% in tropical forests with positive effects concentrated in the wet season (tropical savannas) and the warmer months (tropical forests). We predicted minimal effects of thermal acclimation of photosynthesis on GPP, NPP, and carbon storage in Mediterranean woodlands, temperate woodlands, and temperate forests. Overall, positive effects were strongly enhanced by increasing CO2 concentrations under RCP8.5. We conclude that the direct effects of climate change will enhance carbon uptake and storage in Australian wooded ecosystems (likely due to CO2 enrichment) and that benefits of thermal acclimation of photosynthesis will be restricted to tropical ecoregions.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Cambio Climático / Ecosistema País/Región como asunto: Oceania Idioma: En Revista: Glob Chang Biol Año: 2024 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Cambio Climático / Ecosistema País/Región como asunto: Oceania Idioma: En Revista: Glob Chang Biol Año: 2024 Tipo del documento: Article País de afiliación: Australia Pais de publicación: Reino Unido