Operational Aspects of Row and Selective Thinning in the Establishing of a Shelterwood in a 50-Year-Old Norway Spruce Stand

Suadicani, Kjell; Nordfjell, Tomas

doi:10.1080/14942119.2003.10702467

Cited by 8 publications

(8 citation statements)

References 4 publications

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“…A possible cost-efficient alternative for the future could be to develop systematic thinning methods, where trees are harvested in corridors, lines, rows or strips (Rummer 1993;Suadicani and Nordfjell 2003). The boom-corridor thinning (BCT) method in young stands is one kind of mechanised systematic thinning method (Bergström 2009;Sängstuvall et al 2011;Jundén et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Comparing the characteristics of boom-corridor and selectively thinned stands of Scots pine and birch

Nuutinen¹,

Miina²,

Saksa³

et al. 2021

Silva Fenn.

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Young, dense forest in Finland and Sweden urgently need to receive first thinning. In such stands, conventional selective thinning methods make the harvester work time consuming and, thus, costly. To make small-sized trees economically competitive as raw material for bioenergy and biorefining, new harvesting technologies and/or thinning methods need to be developed. A potential solution is boom-corridor thinning (BCT), rendering effective cutting work. The aim of this study was to describe and compare the stand structure of two Scots pine stands ( L.) and one birch-dominated ( Roth with natural downy birch, Ehrh.) stand after BCT and selective thinning at the first thinning phase. Furthermore, simulations were conducted to predict the future stand development after the first thinning treatments. The density of the growing stock was 16â46% higher after BCT treatment than after selective thinning because BCT stands included more small and supressed trees with a dbh < 100 mm. However, the numbers of future crop trees with a dbh > 140 mm per hectare were at the same level in both treatments. The stem volume removal per hectare did not differ between treatments. However, simulation of stand development and intermediate thinning and clearcutting revealed that the total removal volume was 10â18% higher in BCT stands compared to selectively thinned ones. The saw log volumes harvested did, however, not differ between treatments. This study shows that BCT generates stands with higher biodiversity compared to conventional thinning as higher levels of biomass removal can be reached throughout stand rotations.Pinus sylvestrisBetula pendulaB. pubescens

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Section: Introductionmentioning

confidence: 99%

Comparing the characteristics of boom-corridor and selectively thinned stands of Scots pine and birch

Nuutinen¹,

Miina²,

Saksa³

et al. 2021

Silva Fenn.

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“…Asplund et al 1999, Brunberg et al 1998, Talbot and Suadicani 2005. This system has also been used sometimes when relatively largedimension trees have been thinned and the price ratio between energy-chips and pulpwood has exceeded a certain threshold (Suadicani and Nordfjell 2003). However, such chipping systems cause many logistic problems, and usually there are high costs when a machine in this chain is standing idle, and only small, low-productivity chippers can be used in the field.…”

Section: Introductionmentioning

confidence: 99%

Simulation of geometric thinning systems and their time requirements for young forests

Bergström¹,

Bergsten²,

Nordfjell³

et al. 2007

Silva Fenn.

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In Fennoscandia, large areas that have not been subjected to pre-commercial thinning (PCT), and thus support dense stands, are becoming suitable for harvesting biomass. However, efficient systems for harvesting biomass from young stands have not yet been developed. In order to optimise biomass harvesting it is here hypothesized that the handling unit should not be a single tree but a corridor area, i.e., all trees in a specific area should be harvested in the same crane movement cycle. Three types of corridor harvesting approaches (using accumulating felling heads for geometric harvesting in two different patterns) were compared in terms of time required to fell a corridor of standardised size. Corridors are defined as strips of harvested areas between conventional strip-roads. Harvests were simulated in two types of stands, first thinning (FT) and delayed PCT stands, in which the spatial positions of the trees had been mapped. The differences in simulated time consumption per corridor were minor when the only variable changed was the corridor pattern. However, there were ca. 2-fold and 3-fold differences in simulated time consumption per corridor between the harvesting approaches for the FT stand and the PCT-stand, respectively. Furthermore, area handling (felling head accumulating all trees corridor-wise, with no restrictions on the accumulated number of trees except for a certain load limit) was found to give up to 2.4-fold increases in productivity compared to a single-tree (reference) approach for the FT stand.In conclusion, the simulation results clearly show the benefits of applying area-harvesting systems in young, dense stands.

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“…Estos factores explicaron el 14,4% de la variabilidad observada. El registro independiente del Tbusq y el Tpos permitió determinar que el VmAP afectó únicamente al posicionamiento del cabezal alrededor del fuste, sin impactar en la búsqueda del árbol, tal como sugerían otros estudios que no diferenciaban estas actividades (HILDT et al, 2018;FJELD, 2001;NORDFJELL, 2003).…”

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“…Esto en parte es explicado por el menor volumen medio de los árboles (FULVIO;BERGSTRÖM, 2013). Por otra parte, los movimientos del harvester pueden verse limitados por los árboles circundantes que el operario debe evitar dañar (MEDERSKI et al, 2016;NORDFJELL, 2003).…”

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Efecto de la densidad de las forestaciones y la intensidad de cosecha em raleos mecanizados con harvester

Hildt¹,

Leszczuk²,

Schlichter³

et al. 2019

Sci. For.

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El objetivo de este estudio fue evaluar cómo la densidad de la forestación y la intensidad de los raleos afectan a la cosecha con harvester. Fueron evaluados siete harvesters diferentes, en nueve situaciones de segundo raleo de pino del noreste argentino. Los estudios de tiempos comprendieron el establecimiento de parcelas y la filmación de las operaciones. La densidad media de los rodales fue de 656 árboles.ha-1 , con un volumen medio de 0,53 m 3. El raleo extrajo en promedio el 45% de los árboles. Fueron ajustados modelos mixtos a nivel de parcela para la duración de cada actividad, considerando a las características de la forestación y la operación como factores fijos y al sitio como factor aleatorio. La productividad de la cosecha en las distintas situaciones estuvo comprendida entre 11 y 46 m 3 .h-1. El incremento en la densidad implicó una reducción en el tiempo de búsqueda de los árboles y un aumento en el tiempo de posicionamiento del cabezal, y de desrame y trozado. En cambio, el incremento de la intensidad de raleo redujo el tiempo de búsqueda de los árboles y favoreciendo la cosecha de árboles más grandes, aumentando la productividad. La elaboración de varios productos provocó una reducción del 21,6% en la productividad, respecto al trozado de un único producto triturable.

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Operational Aspects of Row and Selective Thinning in the Establishing of a Shelterwood in a 50-Year-Old Norway Spruce Stand

Cited by 8 publications

References 4 publications

Comparing the characteristics of boom-corridor and selectively thinned stands of Scots pine and birch

Comparing the characteristics of boom-corridor and selectively thinned stands of Scots pine and birch

Simulation of geometric thinning systems and their time requirements for young forests

Efecto de la densidad de las forestaciones y la intensidad de cosecha em raleos mecanizados con harvester

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