A Technological Model of Wood-Harvesting Systems in Poland Considering Changes in Stand Productivity affected by Industrial Air Pollution

Wiesik, J., Komorowski, J., Markowski, M., Suwala, M., & Wierzejski, J. (1989). A Technological Model of Wood-Harvesting Systems in Poland Considering Changes in Stand Productivity affected by Industrial Air Pollution. IIASA Working Paper. IIASA, Laxenburg, Austria: WP-89-081

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Abstract

We built a simulation model of the timber-harvesting system in Poland to enable estimation of costs and the number of machines necessary for accomplishment of tasks under conditions of changing stand productivity including effects by industrial air-pollutant emissions. Taking into account the purpose of modeling, the main production factors we included are: forest area, production of wood assortments, machines needed for the technological process, technological processes carried out by means of these machines, and timber receivers. To each of the factors, some characteristics are ascribed which influence the accomplishment of production. Changes in stand productivity resulting from industrial emissions are considered in the data base as being a set of characteristics of the forest areas.

The input-output model assumes the choice of machines (from the assumed set), cost estimates for the whole harvesting process, and determination of the number of machines by means of which production tasks would be performed at the lowest costs. Predicting the changes in stand characteristics for a given time interval, including the timber volume possible to obtain, the cost and structure of machines can be estimated. The calculations given in this study are based on data from 1986.

The results of our calculations indicate that, for better economic effect, the structure of machinery should be reviewed, especially in view of possible continued forest decline in Poland.

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