Analysis of a Nelder trial in New Zealand and application to management of Pinus radiata D. Don stands in North-Western Spain

Abstract

Profitability of plantations, especially when dealing with exotic species, requires knowledge of how wood properties and growth can be manipulated by silvicultural management. The interactive effects of initial stand density and genotype on stiffness, stem form, branching and growth (height and diameter) was examined reviewing forestry expertise with Pinus radiata D. Don, and measurements recorded in 2009 from a sample of 177 radiata pine stems of a Nelder trial in New Zealand. Breeding programs, widespread in New Zealand stands, interact with management practices. The study shows a higher number of defects in an unthinned situation, and scarce influence of genetic provenance over the stem variables analysed compared to the influence of stocking. The stem variables recorded in New Zealand are easily measured in the field and supply useful information as regards profitability of the stands, including quality of the final product. The overall analysis of the interaction between genetics and silviculture enables sketching valuable guidelines for the establishment of the species in Spain, considering quality and form parameters in production objectives, frequently aimed exclusively at maximizing volume yields.