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- Title
Prediction of photosynthesis in Scots pine ecosystems across Europe by needle-level theory.
- Authors
Hari, Pertti; Noe, Steffen; Dengel, Sigrid; Elbers, Jan; Gielen, Bert; Grönholm, Tiia; Kerminen, Veli-Matti; Kruijt, Bart; Kulmala, Liisa; Launiainen, Samuli; Lindroth, Anders; Petäjä, Tuukka; Schurgers, Guy; Vanhatalo, Anni; Vesala, Timo; Kulmala, Markku; Bäck, Jaana
- Abstract
Photosynthesis provides carbon for the synthesis of macromolecules to construct cells during growth. This fact generates the key role of photosynthesis in the carbon dynamics of ecosystems (Taiz et al., 2015) and biogenic CO2 consumption. The development of eddy covariance measurements of ecosystem CO2 fluxes started a new era in the field studies of photosynthesis (Baldocchi et al., 2000). 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 with photosynthesis. We then show that these equations are able to predict quite precisely and accurately the photosynthetic CO2 flux between the atmosphere and different ecosystems in five Scots pine stands located from northern timberline to Central Europe. Our result has strong implications on the interpretation of the effects of the global change on the processes in boreal forests, especially of the changes in the metabolic annual cycle of photosynthesis.
- Subjects
SCOTS pine; CARBON fixation; PHOTOSYNTHESIS; ECOSYSTEMS; PHOTOBIOLOGY; BIOMES; CHLOROPHYLL
- Publication
Atmospheric Chemistry & Physics Discussions, 2017, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2017-533