Economic analysis and revenue optimization in management regimes of Pinus taeda

Abstract

Economic analysis and revenue optimization in management regimes of Pinus taeda 1The objective of this work was to select, using operational research techniques, management regimes of Pinus taeda L. that maximize the revenue generated by the wood, considering different attractiveness rates. The OpTimber-LP ® software, which performs the simulations using SisPinus ® software, was used for forest optimization. The regimes consisted of different combinations of forest sites, planting densities, thinning regimes and clearcutting ages, totaling 17,760 regimes per site. Wood production was quantified and evaluated by assortment classes. Planting, thinning and harvesting costs were considered. The Annualized Net Present Value (ANPV) and the Internal Rate of Return (IRR) of each management regime were calculated. As a result, the density of 1,600 plants per ha optimized ANPV for most cases. Optimized regimes included no or only one thinning and provided ANPV of 2,753 and 158 BRL per ha and IRR of 22.9% and 2.9% for sites I and IV, respectively. It was concluded that the optimal number of thinning is reduced in lower quality sites, and the less productive the site, the later the optimal year for clear cutting. The attractiveness rate is a parameter that contributes to the selection of thinning regimes, because the larger the rate, the larger the number of thinning and the earlier they should be carried out.Keywords: operational research; annualized net present value; attractiveness rate; forest site; log assortment. Análise econômica e otimização da receita em regimes de manejo de Pinus taeda L. HassanEste trabalho teve por objetivo selecionar, por meio de técnicas da pesquisa operacional, regimes de manejo de Pinus taeda L. que maximizem a receita com a madeira produzida, considerando diferentes taxas de atratividade. Foi utilizado o software OpTimber-LP ® para a otimização florestal, o qual realiza as simulações por meio do software SisPinus ® . Os regimes foram compostos por diferentes combinações de sítios florestais, densidades de plantio, regimes de desbaste e idades para corte raso, totalizando 17.760 regimes por sítio. A produção de madeira foi quantificada e valorada mediante classes de sortimento. Custos de plantio, desbaste e colheita foram considerados. O Valor Presente Líquido Anualizado (VPLA) e a Taxa Interna de Retorno (TIR) de cada regime de manejo foram calculados. Como resultado, a densidade de 1.600 plantas por ha otimizou o VPLA para a maioria dos casos. Os regimes otimizados incluíram nenhum ou apenas um desbaste e forneceram VPLA de 2.753 e 158 reais por ha e TIR de 22,9% e 2,9%, para os sítios I e IV, respectivamente. Concluiu-se que o número ideal de desbastes é reduzido em sítios com qualidade inferior, e quanto menos produtivo for o sítio, mais tardio será o ano ideal para o corte raso. A taxa de atratividade é um parâmetro que contribui para a determinação de regimes de desbaste, pois quanto maior for essa taxa, maior deve ser o número de desbastes, bem como mais precoces devem ser suas aplica...

Intensive Management for Optimizing the Production of High-Value Logs of Pine Forests in Southern Brazil

“…However, age of application showed to be more important in high-density regimes. It is important to highlight that despite thinnings stimulate the tree diameter to grow in faster rates, oftentimes thinnings should not be applied when a forest is managed aiming to maximize total timber volume, disregarding log diameters, such as addressed by David et al (2017a) and Elesbão and Schneider (2011). In addition, we point out that timber production is associated with soil nutrients, light and water available in medium-and high-quality sites (ACERBI JUNIOR et al, 2002), therefore, we must take into account that the behavior of regimes changes among sites of different qualities (GOMES; MAESTRI; SANQUETTA, 1997;SANQUETTA et al, 1998;DAVID et al, 2017b).…”

“…In addition to the modelling issues, simulating variations of interest rates to assess economically forest investments also contributes, among others, to define thinning regimes, once there is a trend in increasing the number of thinnings, when high interest rates and long rotation forests are considered (DAVID et al, 2017a). As our analysis involves only simulations with three thinnings, we cannot examine the need for thinnings as a response to the variation of interest rates, but in respect of planting density, interest rates had low impact, presenting generally an amplitude of ~500 R$/ha (Table 4).…”

Density optimisation of pine plantations in the Left-Bank Steppe in ukraine

“…These regimes, in particular, are continually improved regarding the intensity and frequency of thinning in stands of a certain age to find optimal stand parameters during their cultivation based on data obtained from permanent research objects. Therefore, numerous studies are devoted to the thinning influence on the stand growth and productivity (Savich et al 1978;Ryabokon 1991;Palahí and Pukkala 2003;Tkachuk et al 2003;Crecente-Campo et al 2009;Zhao et al 2011;Gadow and Kotze 2014;Tarnopilska 2014;Zhukovskyi 2015;David et al 2017;Węgiel et al 2018).…”

Accuracy of tree height estimation with model extracted from artificial neural network and new linear and nonlinear models

“…The forestry sector is constantly seeking techniques that facilitate successful timber production in a sustainable way, minimizing losses, optimizing processes and maximizing profits (David et al, 2017). In this context, the measurement procedures are essential elements and deserve attention because they are the basis for determining the volume in an area (Dantas & Oliveira, 2018).…”