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Background Molecular clocks drive oscillations in leaf photosynthesis, stomatal conductance, and other cell and leaf-level processes over ~24 h under controlled laboratory conditions. The influence of such circadian regulation over whole-canopy fluxes remains uncertain; diurnal CO2 and H2O vapor flux dynamics in the field are currently interpreted as resulting almost exclusively from direct physiological...
Abstract. Although the processes governing photosynthesis are well understood, scaling from shoot to canopy in coniferous forests is complex. Development of different sap-flow techniques has made it possible to measure transpiration of whole trees and thereby also of whole canopies. There is a strong link between photosynthesis and transpiration, for which reason it would be interesting to test whether...
The ecosystem process model, FOREST-BGC, was applied on a stand in the NOPEX region in central Sweden. It was compared with measured data of net ecosystem carbon flux (F n ) and transpiration (E Q ) on a daily basis. Using the parameterized model, yearly budgets of carbon and water were constructed. F n was obtained from eddy correlation measurements on a tower at heights of...
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