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An economic model of soil compaction in forestry

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https://ir.library.oregonstate.edu/concern/graduate_projects/zp38wj39r

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  • A model is presented which predicts the net present value of a stand level multi-entry harvest plan. The model accounts for potential volume losses due to harvest-related soil compaction. The goal of this project was to answer five economic questions about the issue of soil compaction in forestry. The five questions tested the sensitivity of net present value to changes in skid trail spacing, to avoiding compaction altogether by the use of aerial yarding systems, to different assumptions about growth losses adjacent to the skid trails, to initial site quality (high vs. low), and to different discount rates used in the net present value calculations. Given the assumptions used in the applications of the model which are presented here, wider trail spacings were warranted while the use of aerial yarding systems to avoid compaction was not warranted. Net present value in this case was very sensitive to growth losses occurring in the area adjacent to the skid trails. Similar compaction ameliorization techniques were called for when high or low sites were considered and greater ameliorization costs were justified when low discount rates were used in the net present value calculations vs. when high discount rates were used. Forest managers can use this model to gain insight into similar issues about harvest-related soil compaction. The model was formulated as an electronic spreadsheet template that runs on IBM PC microcomputers or IBM PC compatible microcomputers.
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