Prediction of photosynthesis in Scots pine ecosystems across Europe by a needle-level theory

Summary, in English

Photosynthesis provides carbon for the synthesis of macromolecules to construct cells during growth. This is the basis for the key role of photosynthesis in the carbon dynamics of ecosystems and in the biogenic CO2 assimilation. The development of eddy-covariance (EC) measurements for ecosystem CO2 fluxes started a new era in the field studies of photosynthesis. However, the interpretation of the very variable CO2 fluxes in evergreen forests has been problematic especially in transition times such as the spring and autumn. We apply two theoretical needle-level equations that connect the variation in the light intensity, stomatal action and the annual metabolic cycle of photosynthesis. We then use these equations to predict the photosynthetic CO2 flux in five Scots pine stands located from the northern timberline to Central Europe. Our result has strong implications for our conceptual understanding of the effects of the global change on the processes in boreal forests, especially of the changes in the metabolic annual cycle of photosynthesis.

• Författare: Pertti Hari; Steffen Noe; Sigrid Dengel; Jan Elbers; Bert Gielen; Veli Matti Kerminen; Bart Kruijt; Liisa Kulmala; Anders Lindroth; Ivan Mammarella; Tuukka Petäjä; Guy Schurgers; Anni Vanhatalo; Markku Kulmala; Jaana Bäck
• Avdelning/ar: Institutionen för naturgeografi och ekosystemvetenskap; BECC: Biodiversity and Ecosystem services in a Changing Climate
• Publiceringsår: 2018-09-18
• Språk: Engelska
• Sidor: 13321-13328
• Publikation/Tidskrift/Serie: Atmospheric Chemistry and Physics
• Volym: 18
• Issue: 18
• Länkar: http://dx.doi.org/10.5194/acp-18-13321-2018
• Dokumenttyp: Artikel i tidskrift
• Förlag: Copernicus GmbH
• Ämne: Meteorology and Atmospheric Sciences
• Aktiv: Published
• ISBN/ISSN/Övrigt: ISSN: 1680-7316