ABSTRACT

Forest fuel production from overgrowth brushwood is an option when regular clearing of forest roadsides or edges of arable land has been neglected for some reason. The basic economic advantages of recovery are that the cost of harvesting can be offset by the existing clearing costs and income from the harvested biomass. The objectives of this study were to: 1) produce a productivity model for a machine unit that can continuously cut and accumulate brushwood trees during linear crane movement; 2) determine the kind of cases when brushwood biomass should be recovered, when the harvesting is based on a one- or two-machine configuration. The cost analyses were performed as a spreadsheet-based simulated treatment, using existing or the productivity models produced herein, and cost parameters for brushwood clearing and harvesting. The Risupeto feller-buncher unit studied in this study was capable of cutting and accumulating trees with a continuous movement that enabled the efficient harvesting of roadside and field-edge brushwood for fuel. The economic result in the brushwood harvesting with the harwarder and Risupeto forwarder configuration was strongly affected by the average volume of the brushwood trees, as well as harvesting removal on the site. Correspondingly, the roadside price of whole trees had a great impact on the potential revenue of brushwood harvesting.

摘要

当由于某种原因忽视定期清理森林路边或耕地边缘时，从过度生长的灌木丛中生产森林燃料是一种选择。回收的基本经济优势是收获成本可以被现有的清理成本和收获的生物质收入抵消。本研究的目的是： 1) 为机器单元建立一个生产力模型，该模型可以在直线起重机运动期间连续砍伐和堆积灌木丛；2) 当采伐基于一台或两台机器配置时，确定应回收灌木生物质的情况。成本分析是作为基于电子表格的模拟处理进行的，使用现有的或此处生成的生产力模型，以及灌木丛清理和采伐的成本参数。本研究中研究的 Risupeto 伐木堆垛机能够通过连续运动切割和堆积树木，从而能够有效地收获路边和田边灌木作为燃料。使用粗伐木机和 Risupeto 集材机配置进行灌木丛采伐的经济结果受到灌木丛树木平均体积以及现场采伐量的强烈影响。相应地，整棵树的路边价格对灌木采伐的潜在收入影响很大。使用粗锯机和 Risupeto 集料机配置进行灌木丛采伐的经济结果受到灌木丛树木平均体积以及现场采伐量的强烈影响。相应地，整棵树的路边价格对灌木采伐的潜在收入影响很大。使用粗锯机和 Risupeto 集料机配置进行灌木丛采伐的经济结果受到灌木丛树木平均体积以及现场采伐量的强烈影响。相应地，整棵树的路边价格对灌木采伐的潜在收入影响很大。