A simple model is formulated in which the driving variabel for nutrition and growth of forest ecosystems is the nutrient flux density (amount of nutrients available per unit of time and unit of area). The flux is devided in two parts, one deliverd by mineralization and the other by fertilization. The model can therefore be used to analyze the dynamic effects of both nutrient asources as well as the natural nutrient fluxe density and thus on the fertility level of the ecosystem.
The model is tested by means of data from a Scots pine ecosystem with quite reasonable results even though the analysis indicates several parameters which are difficult to evaluate satisfactorily with present knowledge. Simulation of the dynamic development of the nutrient flux density under different fertilization regimes indicates large differences in the time required to reach saturation (optimum nutrition) and maximum production. It should therefore be of the utmost interest to study further the conditions for efficient fertilization, minimum losses of fertilizers, and the long-term development of increased nutrient flux densities.
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