1999 Volume 81 Issue 3 Pages 245-249
Thresholds of criteria and indicators accepted in Montreal Process countries were estimated using a linear programming model. The concept of thresholds contains "allowable range" and "a target value", which mean range of indicators satisfying the conditions of sustainable forest management and optimum value of indicators in the allowable range respectively. First, four criteria were selected for the subject of this study and then tentative indicators were set for each criterion at the national level. Next, the thresholds of the indicators were estimated using a linear programming model. Constraints of the model mainly consist of the requirements for sustainable forest management that all of indicators are basically non-decline over planning horizon. Last, optimum solution was found and feasible region was sought by a method of parametric linear programming. Here feasible region can be regarded as the allowable range and optimum solution as the target value. The result was that the thresholds are proper to reflect the trade-off relation among criteria. It was concluded that the concept of threshold is efficient in judging the progress toward sustainable forest management.
