Predicting the growth and yield of Pinus radiata in Bolivia

Guzmán, Gustavo; Pukkala, Timo; Palahí, Marc; de-Miguel, Sergio

doi:10.1007/s13595-011-0162-3

Cited by 16 publications

(10 citation statements)

References 19 publications

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“…Several growth and yield simulators are driven by a model that predicts dominant height as a function of stand age and site index (e.g., Shater et al 2011;Guzmán et al 2012). Use of the dominant height model assumes that dominant height is not reduced in thinning.…”

Section: Introductionmentioning

confidence: 99%

Stand management optimization – the role of simplifications

2014

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Background: Studies on optimal stand management often make simplifications or restrict the choice of treatments. Examples of simplifications are neglecting natural regeneration that appears on a plantation site, omitting advance regeneration in simulations, or restricting thinning treatments to low thinning (thinning from below). Methods: This study analyzed the impacts of simplifications on the optimization results for Fennoscandian boreal forests. Management of pine and spruce plantations was optimized by gradually reducing the number of simplifying assumptions. Results: Forced low thinning, cleaning the plantation from the natural regeneration of mixed species and ignoring advance regeneration all had a major impact on optimization results. High thinning (thinning from above) resulted in higher NPV and longer rotation length than thinning from below. It was profitable to leave a mixed stand in the tending treatment of young plantation. When advance regeneration was taken into account, it was profitable to increase the number of thinnings and postpone final felling. In the optimal management, both pine and spruce plantation was gradually converted into uneven-aged mixture of spruce and birch. Conclusions: The results suggest that, with the current management costs and timber price level, it may be profitable to switch to continuous cover management on medium growing sites of Fennoscandian boreal forests.

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Section: Introductionmentioning

confidence: 99%

Stand management optimization – the role of simplifications

2014

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“…Fixed-effects models are also inferior to mixed-effect models when the aim is to make inferences about the population. However, several studies have shown that a fixed-effects model results in a smaller root mean square error (RMSE) than using only the fixed part of a mixed-effects model (Temesgen, Monleon, & Hann, 2008;Garber, Temesgen, Monleon, & Hann, 2009;Pukkala et al, 2009;Shater, de-Miguel, Kraid, Pukkala, & Palahí, 2011;Groom, Hann, & Temesgen, 2012;Guzmán, Morales, Pukkala, & de-Miguel, 2012a, Guzmán, Pukkala, Palahí, & de-Miguel, 2012bHeiðarsson & Pukkala, 2012). De-Miguel, Guzmán, & Pukkala (2013) found that, in the absence of calibration data, mixed-effects models should be used with caution.…”

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Species Interactions in the Dynamics of Even- and Uneven-Aged Boreal Forests

Pukkala

Lähde²,

Laiho³

2013

Journal of Sustainable Forestry

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107

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Many boreal tree stands are neither clearly even-aged nor clearly uneven-aged. The stands may undergo a series of stages, during which an even-aged stand is transformed into two-storied mixed stand, and finally to multistoried or uneven-aged stand structure. The species composition often changes during the succession of stand stages. This study developed models for stand dynamics that can be used in different stand structures and species compositions. The model set consists of species-specific individual-tree diameter increment and survival models, and models for ingrowth. Separate models were developed for Scots pine, Norway spruce, and hardwood species. The models were used in a growth simulator, to give illustrative examples on species influences and stand dynamics. Methods to simulate residual variation around diameter increment and ingrowth models are also presented. The results suggest that mixed stands are more productive than one-species stands. Spruce in particular benefits from an admixture of other species. Mixed species improve diameter increment, decrease mortality, and increase ingrowth. Pine is a more beneficial admixture than birch. Simulations showed that uneven-aged management of spruce forests is sustainable and productive, and even-aged conifer stands growing on medium sites can be converted into uneven-aged mixed stands by a series of strong high thinnings.

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“…When comparing the productivity of E. globulus and P. radiata (the most planted exotic species in the study area) in Bolivia, eucalypts seem to be less productive since MAIs up to 25 m 3 ha -1 yr -1 have been observed in the most productive pine stands. The optimal rotation lengths for maximum wood production would be 5-10 years longer for the pines (Guzmán et al, 2012) on the best sites. To our knowledge, this is the first study in The relationship between stand mean diameter and maximum basal areas predicted by the adjusted model are biologically more consistent than those obtained directly from the fitted model, the latter overestimating tree mortality and, therefore, underestimating maximum stand basal area.…”

Section: Discussionmentioning

confidence: 99%

A model for predicting the growth of Eucalyptus globulus seedling stands in Bolivia

et al. 2012

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Eucalyptus globulus is one of the most planted species in the Inter-Andean Valleys of Bolivia, where growing conditions are different from most places where eucalypts have been studied. This prevents a straightforward utilization of models fitted elsewhere. In this study a distance-independent individual-tree growth model for E. globulus plantations in Bolivia was developed based on data from 67 permanent sample plots. The model consists of sub-models for dominant height, tree diameter increment, height-diameter relationship and survival. According to model-based simulations, the mean annual increment with the optimal rotation length is about 13 m 3 ha -1 yr -1 on medium-quality sites and 18 m 3 ha -1 yr -1 on the best sites. A suitable rotation length for maximizing wood production is approximately 30 years on medium sites and 20 years on the most productive sites. The developed models provide valuable information for further studies on optimizing the management and evaluating alternative management regimes for the species.Key words: plantations; individual-tree growth and yield; simulation; eucalypts; blue gum. Resumen Un modelo para predecir el crecimiento de Eucalyptus globulus procedente de semilla en BoliviaEucalyptus globulus es una de la especies más plantadas en los Valles Inter-Andinos de Bolivia, donde las condiciones ecológicas difieren de la mayor parte de zonas en que esta especie ha sido objeto de estudio. Por este motivo, no es aconsejable la aplicación directa de los modelos desarrollados para otras zonas. En este estudio se desarrolló un modelo de crecimiento de árbol individual independiente de la distancia para E. globulus en Bolivia a partir de los datos medidos en 67 parcelas permanentes. El modelo está formado por los siguientes submodelos: altura dominante, incremento en diámetro, relación altura-diámetro y supervivencia. Las simulaciones basadas en las ecuaciones del modelo arrojaron crecimientos medios anuales de 13 m 3 ha -1 año -1 en sitios de calidad media y de 18 m 3 ha -1 año -1 en los sitios de mayor calidad. La máxima renta en especie se alcanza a los 30 años en sitios de calidad media y a los 20 años en los mejores sitios. Los modelos desarrollados aportan información valiosa para futuros estudios de optimización de la gestión y de evaluación de alternativas de manejo para esta especie.

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Predicting the growth and yield of Pinus radiata in Bolivia

Abstract: International audienc

Cited by 16 publications

References 19 publications

Stand management optimization – the role of simplifications

Stand management optimization – the role of simplifications

Species Interactions in the Dynamics of Even- and Uneven-Aged Boreal Forests

A model for predicting the growth of Eucalyptus globulus seedling stands in Bolivia

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