Evaluating standard treatment options for Pinus radiata plantations in Galicia (north-western Spain)

摘要

Standard treatment options for Pinus radiata plantations in north-western Spain are evaluated. The new options are compared with the usual regimes applied on communal forests and private land. Stand development was simulated for each regime using a dynamic stand growth model that includes diameter distributions, generalized height-diameter relationships and taper functions for estimating product yields. Four different timber grades were estimated for the different thinnings and clearfellings to predict the cash flows. The different standard options were ranked using the criteria net present value of an infinite series of rotations (NPVIS) and internal rate of return (IRR). The proposed management regime for communal forests, which is characterized by lower stand densities and an extended rotation, provides high quality products and could have additional advantages regarding biodiversity and other non-tangible benefits. However, in economic terms, this regime is not superior to the standard regime applied by the Forest Service. The Forest Service variant, which includes high pruning, gives the best economic results. The usual high-density regime encountered in private plantations is not optimal, either in economic or silvicultural terms. The proposed alternative would result in much better wood quality, greater stand stability and higher economic returns.