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Tuesday, July 28, 2020 | History

2 edition of Optimal timber harvesting in uneven-aged forest stands found in the catalog.

Optimal timber harvesting in uneven-aged forest stands

Robert G. Haight

Optimal timber harvesting in uneven-aged forest stands

a discrete-time optimal-control approach

by Robert G. Haight

  • 291 Want to read
  • 34 Currently reading

Published .
Written in English

    Subjects:
  • Logging -- Economic aspects.

  • Edition Notes

    Statementby Robert Gordon Haight.
    The Physical Object
    Pagination[10], 115 leaves, bound :
    Number of Pages115
    ID Numbers
    Open LibraryOL14271511M

    Harvest Trends on National Forest System Lands. A report that displays acres of National Forest System lands (NFS) where commercial timber sales were accomplished by year, , and by harvest method. See the Harvest Trends Report (PDF, KB). These additional steps will only minimally impact timber income. Clearcut area immediately after the harvest and 4 months later. Seed-Tree Harvest. A seed-tree harvest leaves 6 to 12 mature, well-formed trees per acre to serve as a seed source for the next stand of trees. The seed trees can be harvested once the new stand is established.

      Harvest 2, acres of timber through even-aged management, acres through uneven-aged management, and 5, acres through thinning; Regenerate 8, acres naturally and acres by planting, including manual or mechanical site preparation; Impr acres of timber stands non-commercially. Even-aged and Uneven-aged Stands. Even-aged stands generally have one age class, although two age classes can be found in some two-layered natural or managed stands. These stands generally have a well-developed canopy with a regular top at a uniform height. Pure even-aged stands generally have a nearly bell-shaped diameter distribution.

    calculates the value of bare land in perpetual timber production and is often used to value even-aged pine plantations. However, it is also useful in the valuation of immature timber stands and uneven-aged timber stands cut periodically. These models have wide applicability in timberland appraisal situations.   Timber Harvesting Techniques. The main purpose of timber harvesting is to create conditions that will allow the forest to renew or reproduce itself. When trees are removed, the canopy is opened and new trees are allowed to regenerate. Also, removing trees creates more space for mast producing trees to grow.


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Optimal timber harvesting in uneven-aged forest stands by Robert G. Haight Download PDF EPUB FB2

Generate uneven-aged forests. The basic requirement of regeneration methods resulting in uneven-aged forests is the periodic harvest or natural death of a portion of the mature forest at regular intervals. To create the balanced uneven-aged distribution, harvest or natural death must be followed by successful regeneration.

The economic analysis of uneven-aged forest management with multiple product classes is an important and understudied topic.

Forest management impacts several types of economic value including the values of forestlands, timber products, and forest amenities such as outdoor recreation, carbon sequestration and biodiversity.

Each of these types of product or amenity values or changes in. Methods to Use When Uneven-Aged Management Is Preferred. The Selection Method - The selection harvest method is the removal of mature timber, usually the oldest or largest trees, either as single scattered individuals or in small groups.

Under this concept, the removal of these trees should never allow a stand to revert back to an even-age. However, with the interest rate greater than or equal to %, the optimal rotation period becomes infinite, i.e. it becomes optimal to apply uneven-aged forestry instead of even-aged forestry.

With a lower regeneration cost ( €), the rotation period is shorter and uneven-aged forestry becomes optimal when the interest rate exceeds %.Cited by: Keywords: uneven-aged forestry; optimal harvesting; single-species stand; transition matrix model; size-structured model; single-tree model Introduction Traditional forest industry and timber production are declining in Europe, Canada, and the USA, while paper and.

This study analyzes the optimal harvesting of uneven-aged Norway spruce (Picea abies (L.) Karst.), Scots pine (Pinus sylvestris L.), and birch (Betula pendula Roth. and B. pubescens Ehrh.) analysis is based on an economic description of uneven-aged forestry using a size-structured transition matrix model and a single-tree model.

7 Uneven-aged management entails: Maintaining trees of different age classes in the same area-Calls for more or less equal, periodic harvests-Under this practice, trees are removed on an individual basis to leave a desired number of trees in each size class-Variety of goals can be met-Each harvest stimulates reproduction of new trees and enhances the growth and yield of.

Over the life of the forest, uneven-aged stands have potential for higher wildlife diversity than single age stands. This is achieved by having trees of various sizes across the landscape. Bobwhite quail, which requires an open, grassy understory for nesting, foraging, and raising young, benefit from uneven-aged forests.

Timber harvesting, skidding and hauling on forest roads and trails are potential causes of erosion, soil degradation and sedimentation. With the assistance of a professional forester, you can make a pre-harvest plan that will result in a good timber sale and harvest contract and adequate oversight of the process to minimize environmental impacts.

An illustration of the two forest management systems to be compared in this study: the even-aged (a) and uneven-aged (b) forest stand level, even-aged management comprises a clear and repetitive cycle of distinct phases, including the regeneration, growing, and thinning, and final harvesting where typically a low number of live retention trees are leaf on the clear.

Third, the value of timber depends heavily on how much timber is sold in one timber sale and what kind of harvesting is done. Often, the larger the sale, the higher the price per unit of wood that can be offered. It can be more costly per unit of wood removed to cut only a few, selected trees, rather than cut most or all trees in the stand.

Harvesting Forest Trees Unit B. Plant Wildlife Management Problem Area 3. Forest Management a forest. Conversely, the productivity of timber stands can be virtually destroyed by poorly planned or careless logging.

Even in forests managed primarily for purposes other than tim- maintain an uneven-aged stand. The goal of selection cutting. The average tree diameter in an uneven-aged stand will likely fluctuate over time with harvest removals, ingrowth, and mortality.

The diameter distribution of an uneven-aged stand, as we discussed in Chapter 2, Valuing and Characterizing Forest Conditions, should resemble a reverse J-shaped curve.

Although we present the reverse J-shaped. Have your trees and timber assessed. Assessments can be made on timber stands to determine overall age, health, past management, current and future value, and current and future products and/or benefits the stands provide.

An Example of Uneven-Aged Forest Management for Sustainable Timber Harvesting Article (PDF Available) in Sustainability 10(9) September with Reads How we measure 'reads'. An economic model for harvesting forest stands is presented and used to contrast the two major timber harvesting systems: even-aged and uneven-aged management.

In contrast to even-aged management, the value of uneven-aged stand harvesting cannot be separated into independent components for stand value and land value.

Traditional uneven-aged forest management seeks a balance between equilibrium stand structure and economic profitability, which often leads to harvesting strategies concentrated in the larger diameter classes. The sustainability (i.e., population persistence over time) and influence of such economically optimal strategies on the equilibrium position of a stand (given by the stable diameter.

Regeneration Harvest. Several systems are used to harvest and regenerate forest stands. Selection of the system influences the character of the “new” stand. Stands may develop that are even-aged (all trees are essentially the same age), or uneven-aged (trees are many ages, from young seedlings to mature trees and everything in between).

Forest Products Cut and Sold from the National Forests and Grasslands. FY National Summary Cut and Sold Data and Graph (PDF, KB). Cut and Sold reports show total volumes and values of all convertible forest products sold and harvested from the National Forest System lands and National Grasslands agency-wide, and by organizational unit.

Orou G. Gaoue, Calistus N. Ngonghala, Jiang Jiang, Maud Lelu, Towards a mechanistic understanding of the synergistic effects of harvesting timber and non‐timber forest products, Methods in Ecology and Evolution, /X, 7, 4, (), ().

Generally, NPV is the most useful and reliable method. You can use NPV to evaluate either an established or new timber stand. By considering the value of the current forest stand and estimating future value, growth, and costs, you can determine the stand’s optimum harvest age.Instead, we take the existing, potentially uneven, age distribution of timber as given and derive the optimal policy function|the optimal timber-harvesting proflle|in terms of this age distribution.

Fourth, we use best-practice biological methods to model the dynamics of uneven-aged forest growth and yield. Fifth, in the past.Understory--the smaller vegetation (shrubs, seedlings, saplings, small trees) within a forest stand, occupying the vertical zone between the over- story and the herbaceous plants of the forest floor.

Uneven-aged stand--a group of trees of a variety of ages and sizes growing together on a site. Case Study: Harvesting Timber to Improve Wildlife.