Modeling CO2 Assimilation Patten within a Tall Forest Ecosystem over a Complex Terrain
Date Issued
2010
Date
2010
Author(s)
Su, Chun-Tai
Abstract
Undulating terrain will cause some impacts on the carbon exchange between the forest and the atmosphere, but only a few studies taken into account the fact of topography the exchange of vortex structure between above plants and within plants the influences of the photosynthesis in canopy and the net ecosystem carbon dioxide exchange. In order to quantify the topographic influence, in this study, we investigate the radiation exchange, the dynamic interaction between the fluid of neutral stratification and ecophysiological controls on carbon sources and sinks over an artificial cosine-shaped hill. In addition, the sensitivity analysis were conducted to explore the influences of different parameters, such as zenith angle, leaf-area-density and height of hill, on the model results.
The simulated CO2 concentration distribution within the canopy reasonably shows the strong correlations between concentration distribution within the canopy and the light environment over the hill (for sunlit and shaded sides). According to the simulation results of the carbon fluxes, the net photosynthesis assimilation rate is highest at top of the canopy which is close to 13.5μmolm^(-2) s^(-1). Finally, the results of sensitivity analysis showed that the most sensitive parameters to the CO2 concentrations was leaf area density(-2.02%), followed by solar zenith angle(+1.94%), height of the hill(+0.24%) and the illumination intensity(-0.17).
Subjects
canopy
light environment
perturbation velocity
eddy flux
photosynthesis
Type
thesis
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