Discussion: Road network designs in wood supply analysis

A system for designing timber management strategies which considers the location, construction timing, and standards of road networks is presented. The system allows the effects of alternative road networks on economic wood supplies and timber management strategies to be assessed. A geographic information system is used to update stand attributes in response to alternative road networks, prior to analysis using a linear-programming-based forest planning model. A case study illustrating the planning system is briefly reviewed and instructions for obtaining system software are provided. Key Words: timber management planning, geographic information system, spatial analysis, road network design, linear programming, wood supply analysis.

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Commercial thinning to provide harvest stability to forests with an unbalanced age class distribution

The Forestry Chronicle ◽

10.5558/tfc70299-3 ◽

1994 ◽

Vol 70 (3) ◽

pp. 299-303 ◽

Cited By ~ 3

Author(s):

Mark Jamnick ◽

Ted Needham ◽

Marshall Bateman

Keyword(s):

Stages Of Development ◽

Wood Supply ◽

Habitat Protection ◽

Class Distribution ◽

Age Class ◽

Commercial Thinning ◽

Supply Analysis ◽

Mature Stands

Maintaining harvest stability while minimizing volume losses to mortality is a challenge in forests characterized by an unbalanced age-class distribution with an overabundance of "over-mature" and too few 'mature' stands. In many areas with this situation, emphasis is on harvesting over-mature stands and regenerating them quickly at defined density and stocking levels to minimize the eventual wood supply downfall. However, silvicultural activities in stands at other stages of development are often neglected. Wood supply analysis of a spruce-fir forest with the above characteristics indicated that both harvest stability and maintenance of the total volume harvested could be obtained by commercial thinning in mature stands. In addition, the treatment may have other benefits such as habitat protection. Defining the specifics of the treatment is required to move from consideration at the strategic level to operational implementation.

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L'approvisionnement en bois brut dans un marché de concurrence imparfaite

Schweizerische Zeitschrift fur Forstwesen ◽

10.3188/szf.2015.0299 ◽

2015 ◽

Vol 166 (5) ◽

pp. 299-305 ◽

Cited By ~ 1

Author(s):

Mehdi Farsi ◽

Gèraud Krähenbühl

Keyword(s):

Imperfect Competition ◽

Behavioral Characteristics ◽

Firm Characteristics ◽

Wood Supply ◽

Econometric Methods ◽

Factors Influencing ◽

Target Revenue ◽

Price Negotiations ◽

Forest Enterprises ◽

Supply Analysis

Raw wood supply in a market with imperfect competition This contribution performs a supply analysis of the Swiss forest enterprises. It explores the factors influencing the quantity of supply, and determines the behavioral characteristics of the forestry firms. Based on econometric methods, the main characteristics of the firms in this strongly heterogeneous and changing sector are taken into account. Overall, the results suggest that Swiss forestry firms are not acting as profit maximizers. In fact, at least some of them, namely the smaller ones, seem to strive for a certain level of revenues, allowing them to cover their current costs (the so-called target revenue model), irrespective of their market position. Specifically, estimations indicate a negative price elasticity of supply, i.e., the quantity of wood supplied decreases with increasing prices. The intensity of this reaction depends on firm characteristics, such as type of ownership (private or public) and the size of the enterprise. Moreover, the results point to the existence of market power among larger forestry firms, which might be used in price negotiations with sawmills and other buyers.

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A case study in spatial wood supply analysis

The Forestry Chronicle ◽

10.5558/tfc68503-4 ◽

1992 ◽

Vol 68 (4) ◽

pp. 503-516 ◽

Cited By ~ 4

Author(s):

G. A. Jordan ◽

E. Z. Baskent

Keyword(s):

New Brunswick ◽

Developmental Stages ◽

Wildlife Habitat ◽

Harvest Scheduling ◽

Wood Supply ◽

Spatial Strategies ◽

Supply Model ◽

Supply Analysis ◽

The University

This paper shows the effects of extraction economics and wildlife habitat values on wood supply for a 9,640 stand forest in New Brunswick. Using a spatial wood supply model developed at the University of New Brunswick, the paper quantifies and explains wood supply effects of harvest blocking, road cost and harvest adjacency delay. Eight spatial strategies test harvest scheduling based on geographic forest structure (distribution of stand developmental types and stages). Given a forest of mostly regenerating and mature developmental stages, wood supply reductions vary from 4.9% to 19.2% when compared to a convention aspatial assessment. The paper presents and explains reductions for all eight spatial strategies; but concludes that all are explained by the impacts that harvest blocking, road cost, or harvest adjacency delay have, singly, or in combination, on either mortality losses or the rate at which harvesting recycles forest area. Key words: Forest management, forest dynamics, GIS, wildlife, simulation, wood supply, harvest scheduling

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