The main objective of this study was to offer an alternative methodology for
forest sector modeling in developing economies. To this effect, a policy preference
function was developed and estimated using data from the forest sector of the Cote
d'Ivoire.
The justification for this alternative framework for forest sector analysis...
Procedures are developed for integrating short-term,
area-based plans with long-term, strata-based harvest
schedules. These procedures were tested on a 4000 hectare
tract of forest land in British Columbia. It is shown that
a combination of these two approaches to forest planning
provides a spatially feasible short-term solution that is
also...
As part of the effort to evaluate TRIM (Timber Resource Inventory
Model) for the next RPA National Assessment, a study was conducted
using natural pine stands in North Carolina. TRIM has been used for
regional timber supply studies in both the Pacific Northwest and the
South (Southern Timber Supply Study)....
A dynamic programming algorithm (MS PATH) was used to develop a stand level optimization model, FPS Optimizer. The model incorporates a late-seral constraint on the profit maximizing objective function utilizing a four-descriptor structural index as a proxy. This index, the 'Old-Growth Index', rates the late-seral structural quality of a given...
One traditional problem in forest management is to
find the optimal stand level management regime. Four
important silvicultural practices including precommercial
thinning, commercial thinning, fertilization and regeneration
harvest are considered jointly in this study. The
partial analyses, i.e. considering some of the silvicultural
practices, are also discussed.
The inability to...
The Elliott State Forest, located in the Coast Range of Oregon, is currently revising their Habitat Conservation Plan (HCP). Many of the constraints in the HCP are spatial, requiring identification of specific parcels in order to limit activity along habitat reserves, limit harvest opening size, and to coordinate activities within...
Lagrangean relaxation is presented as a solution
technique to solve flow constrained area-based harvest
scheduling problems. The best set of multipliers in the
Lagrangean approach is obtained through the subgradient
method. Guidelines to set some parameters to compute the
step size in the subgradient algorithm are provided. An
additional procedure...
A 20-year-old Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco] stand in the Oregon Coast Range was thinned from about 1,700 to about 350 trees/ac. Subsequent thinnings, under eight different regimes, occurred at ages 23, 27, 30, and 32. Average net periodic cubic-volume growth was strongly influenced by thinning regime, varying from about...
The Washington State Department of Natural Resources' Comprehensive Tree-Volume Tarif Tables are a set of preconstructed local volume tables. This can increase "on plot" efficiency since only diameters are necessary to obtain volumes after the proper table for the given diameter/height relationship is accessed. The tables are accessed and indexed...