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Strategic forestry planning : evaluation of variable spatial aggregations and forest landscapes

Lind, Torgny (2000). Strategic forestry planning : evaluation of variable spatial aggregations and forest landscapes. Diss. (sammanfattning/summary) Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230
ISBN 91-576-5883-8
[Doctoral thesis]

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This thesis deals with strategic forestry planning. The outcomes from strategic planning, such as potential harvest volumes, growth, net revenues from harvesting, and areas clearcut, should provide ready guidelines for planners and managers and form a base for tactical and operational planning.
Methods estimating costs for regeneration, logging, and off-road extraction, and the distribution on assortments of felled volume based on data from Swedish National Forest inventory (NFI) sample plots in a system for long-term forecasts of timber yields and potential cut (the Hugin system) are developed and evaluated.
As a base for a forest management programme in the Hugin system, results from a questionnaire study of the public preferences concerning the forest environment in a northern Swedish county were used. The results were translated into forest data useful in the Hugin system for selection of appropriate NFI sample plots. A forest scenario with high consideration given to peoples’ preferences regarding different forest attributes was compared with a scenario with 1990s levels of cutting and use of silviculture methods. The management programmes differed substantially, with much more single tree selection, natural regeneration and higher shares of broad-leaved trees in the first scenario. In this scenario, which considered the people’s preferences, calculations indicated an approximately 20% reduction in logged timber volumes, which corresponds to a 10% loss of profit.
Generally, the basic unit in tactical and operational planning is predefined stands. With small homogeneous stands the opportunities to apply optimal management at the local level are better than with large heterogeneous stands, but the costs for inventories, planning, and harvesting single stands will be higher. The economic consequences of different stand delineation strategies were analysed on an area of 5900 ha having a continuous description of forest variables in raster elements estimated using field and satellite data combined by the k nearest neighbour (kNN) method. The results indicate that differences in net present values (NPVs) are small: 0.8 % and 2.0 % higher NPV for small stands than for medium and large stands (3.6, 7.8, and 21.2 ha), respectively. When including entry costs, that is, the cost of moving machines between treatment units, large stands have 2.1% and 3.2 % higher NPV than medium and small stands, respectively.
In the final study, the formation of treatment units was included as a part of the planning process. Dynamic treatment units were formed and selected for harvest such that NPVs were maximised for a forest area of 558 ha in Northern Sweden. The forest variables were described in raster elements (30 m x 30 m) estimated by the kNN method. The degree of clustering was controlled by an entry cost for logging. Simulated annealing was used as solution technique. The results show that the net present values are at least as high as forestry with predefined stands even if entry costs are included. The NPV from felling decreases by about 4% when the degree of clustering is increased to about the same level as with predefined stands.

Authors/Creators:Lind, Torgny
Title:Strategic forestry planning : evaluation of variable spatial aggregations and forest landscapes
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :2000
Number of Pages:28
Publisher:Swedish University of Agricultural Sciences
ISBN for printed version:91-576-5883-8
Publication Type:Doctoral thesis
Article category:Other scientific
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
Keywords:forest landscape, forest management, forest recreation, planning, simulated annealing, stands, strategic planning
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ID Code:17685
Faculty:S - Faculty of Forest Sciences
Department:(S) > Department of Forest Resource Management and Geomatics (until 061231)
Deposited By: SLUpub Connector
Deposited On:05 Oct 2020 10:51
Metadata Last Modified:08 Oct 2020 12:53

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