On economic consequences of transformation of a spruce (Picea abies (L.) Karst.) dominated stand from regular into irregular age structure

[摘要] This paper compares a transformation strategy with an even-aged (EA) treatment (rotation period 98 years) that concludes in a clear-cut. Transformation began at a stand age of 41 years after which both strategies were considered for 77 years. In order to describe the treatments, data from a thinning trial and measurements from a two-aged stand (spruce 58 years, fir 15 years) in Freising (Upper Bavaria, Germany) were used. To project the data up to a stand age of 118 years simulations using the single tree, distance dependent growth model SILVA were carried out. The economic analysis showed a considerably lower amount on harvested timber and a considerably lower income earned for the transformation strategy. However, income from the transformation strategy occurred earlier and more uniformly distributed over time. Due to this fact, the net present value (NPV) of transformation exceeded that of EA management during a limited time period of 77 years given an interest rate of 2.6% (break-even interest). Assuming an infinite time horizon, the break-even interest rate was 1.9%. Changes in stumpage price or rotation length showed minor impact on the break-even interest of transformation. (C) 2001 Elsevier Science B.V. Ali rights reserved.

[发布日期] 2001-10-01

[效力级别]  Proceedings Paper

[关键词] uneven-aged;economics;continuous cover;growth