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Forest planning with consideration to spatial relationships

Öhman, Karin (2001). Forest planning with consideration to spatial relationships. Diss. (sammanfattning/summary) Umeå : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae. Silvestria, 1401-6230 ; 198
ISBN 91-576-6082-4
[Doctoral thesis]

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Abstract

This thesis deals with approaches that can be used to consider spatial relationships in long term forest planning. In the thesis the optimization approach is used, i.e. variables in some way describing the spatial relationships are processed by the solution algorithm, and the spatial layout of harvest activities or habitats is generated by the optimization. In the first part of the thesis, the core area was tested as a criterion for forming contiguous areas of old forest while maximizing the net present value of future forest management. The core area concept was applied in different case studies both to a simulated forest landscape and an actual one in northern Sweden. Because of the non-linear characteristics in the model formulations the problems were solved with a heuristic method, in this case simulated annealing. To increase the scope of the models to include the forest-wide constraints normally encountered in forest planning, a new approach that integrates linear programming with simulated annealing was also tested. The second part of the thesis deals with the aggregation of the harvests in time and space. A new criterion, based on the clustered volume of timber to be harvested, was developed to obtain aggregation of harvested areas. The criterion was in a case study applied to a landscape where high levels of consideration are also paid to biodiversity and recreation. Finally, a new model was developed that could be solved with exact solution techniques for clustering the harvest and the areas set aside as reserves. In contrast to the other models this was applied to a landscape where the decision units were pixels (20*20meters) instead of stands. The results show that it is possible to include considerations of spatial relationships in long-term forest planning, also when the problems are of a size found in real-world situations. For problems where the forest-wide constraints are few and only relate to the spatial aspects it seems that heuristics alone is adequate. When more forest-wide constraints are added to the problem, a suitable approach could be to combine two solution techniques into one integrated solution procedure. The experiments with exact solution techniques suggest that, at least when pixels are used as the primary decision unit, also relatively large problems can be solved exactly if proper formulations can be found. Finally, the results indicate that using effective methods for solving spatial problems will reduce the cost connected to taking spatial consideration

Authors/Creators:Öhman, Karin
Title:Forest planning with consideration to spatial relationships
Year of publishing :January 2001
Volume:198
Number of Pages:32
Papers/manuscripts:
NumberReferences
ALLI. Öhman, K. and Eriksson, L.O. 1998 1 . The core area concept in forming contiguous areas for long term forest planning. Canadian Journal of Forest Research 28:1032-1039. II. Öhman, K. 2000 1 . Creating continuous areas of old forest in long term forest planning. Canadian Journal of Forest Research 30:1817-1823. III. Öhman, K. and Eriksson, L.O. 2001 2 . Allowing for spatial consideration in long term forest planning by linking linear programming with simulated annealing, Forest Ecology and Management .In Press. IV. Öhman, K. and Lämås, T. 2001. Clustering of harvest activities in multi-objective long-term forest planning, submitted manuscript. V. Öhman, K. 2001. Clustering of harvest activities and nature reserves with mixed integer programming, submitted manuscrip
Place of Publication:Umeå
ISBN for printed version:91-576-6082-4
ISSN:1401-6230
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
X Agricola extesions > X10 Mathematics and statistics
Subjects:Not in use, please see Agris categories
Agrovoc terms:forestry, forest management, planning, linear programming, harvesting frequency, spatial distribution, nature conservation
Keywords:connectivity problems, fragmentation, harvest scheduling, mathematical programming, spatial structure, strategic planning
ID Code:31
Department:(S) > Dept. of Forest Resource Management
(NL, NJ) > Dept. of Forest Resource Management
Deposited By: Staff Epsilon
Deposited On:02 May 2002 00:00
Metadata Last Modified:02 Dec 2014 10:01

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