Abstract
The model PERUN calculates daily CO 2 exchange per unit ground area in uniform forest stands. Driving variables are standard meteorological observations. The model takes into account plant processes such as net photosynthesis, dark respiration of leaves, and respiration of stems and branches of trees by suitable simplified submodels. The model assumes healthy plants, ample water supply and appropriate nutrition. Application of PERUN to the case of a willow ( Salix viminalis Clone 082) stand in southern Sweden is demonstrated. Simulated values of net assimilation were tested against measurements of above ground biomass production on a daily basis during the period 1 May-10 October 1981. Simulated cumulative values overestimated measured biomass production by 10% at the end of the growing season.
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