Simulation and comparison of silvicultural alternatives for even-aged Pinus pinaster Ait stands in Galicia (Northwestern Spain)

Three silvicultural alternatives for pure, even-aged stands of maritime pin e (Pinus pinaster Ait) grown in Galicia (Northwestern Spain) are simulated and compared. First, each silvicultural alternative is described by a speci fic combination of initial stand-density, pre-commercial treatment, thinnin g pattern, and rotation age. The development of each silvicultural alternat ive is simulated using a regional growth and yield projection system based on a dynamic stand growth simulator and a size class model for representati ve trees. Different timber grades associated with each alternative are pred icted and estimates of costs and selling prices are used to predict a cash flow pattern for each of the simulated alternatives. Finally, the alternati ves are ranked using the criteria net present value of an infinite series o f like rotations and internal rate of return. For the present market condit ions, the most intensive silvicultural alternative is the most desirable on e if profit maximization is the objective of forest management.