MODELING THE INFLUENCE OF HYDROLOGICAL PROCESSES ON THE CARBON CYCLE OF A FOREST ECOSYSTEM

L. S. Kuchment and V. N. Demidov

A model of the impact of hydrological processes on the carbon cycle of a forest ecosystem is proposed. The model incorporates the description of vertical water transfer in the soil—vegetation—atmosphere system, the photosynthesis process, and dependence of this process on leaf temperature, stomatal conductance, and plant and soil respiration. The model is tested on data of special gradient observations of energy, moisture, and carbon dioxide fluxes carried out at a pine forest site in central Canada during the international BOREAS experiment. Most of the model parameters are assigned using the field measurements; four parameters are calibrated. A good consistency between the observed and model values of evapotranspiration and the net CO2 exchange between the forest ecosystem and the environment is achieved. Numerical experiments are performed with the model to obtain a qualitative estimate of the influence of variations in soil moisture on pine forest photosynthesis and respiration.

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