Performance of a whole tree mechanised timber harvesting system when clear-felling a 32-year-old Pinus taeda L. stand

IF 1.5 4区 农林科学 Q2 FORESTRY
Natali De Oliveira Pitz, Jean Alberto Sampietro, Erasmo Luis Tonett, Luis Henrique Ferrari, Philipe Ricardo Casemiro Soares, M. Bonazza, Daiane Alves de Vargas, Marcos Felipe Nicolleti, Renato Cesar Gonçalves Robert
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引用次数: 0

Abstract

Background: Work studies are fundamental for the development and assessment of timber harvesting systems aimed at rationalising and improving forest management activities.   Methods: This study evaluated the operational performance of a mechanised whole-tree harvesting system in 32-year-old Pinus taeda L. stands producing multiple timber products. A time and motion study at the cycle element level was conducted to evaluate the operational performance of each component of the harvesting system. Equations were developed to estimate the productivity of tree extraction activity with a wheeled skidder and log loading with a mechanical loader. Results: Tree felling with an excavator-based harvester had the highest mean productivity (135 m3 per productive machine hour), followed by tree extraction with a wheeled skidder (117 m3 per productive machine hour), while manually processing larger logs with a chainsaw had the lowest productivity (25.7 m3 per productive machine hour). Operator, extraction distance and mean log volume had a significant effect on the performance of different activities and were included in productivity models. Conclusions: Operational performance of equipment was variable and dependent on the effect of the operator, extraction distance and log volume. Thus, the use of models to estimate productivity considering such factors, coupled with reduced delays to increase utilisation of equipment, will contribute to the better management and planning of forest harvesting operations under the evaluated conditions.
整树机械化木材采伐系统对32年生火炬松林分的采伐性能
背景:工作研究是制定和评估旨在合理化和改进森林管理活动的木材采伐系统的基础。方法:本研究在生产多种木材产品的32年生火炬松林分中评估了机械化整树采伐系统的操作性能。在循环元件水平上进行了时间和运动研究,以评估收割系统每个部件的操作性能。开发了估算轮式集材机采树活动和机械装载机装载原木活动生产力的方程。结果:使用挖掘机收割机砍伐树木的平均生产率最高(每生产机器小时135立方米),其次是使用轮式集材机采油(每生产机械小时117立方米),而使用链锯手动处理较大原木的生产率最低(每生产机时25.7立方米)。操作员、提取距离和平均原木体积对不同活动的性能有显著影响,并包含在生产力模型中。结论:设备的操作性能是可变的,取决于操作员的影响、提取距离和对数体积。因此,考虑到这些因素,使用模型来估计生产力,再加上减少延迟以提高设备利用率,将有助于在评估条件下更好地管理和规划森林采伐作业。
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来源期刊
CiteScore
2.20
自引率
13.30%
发文量
20
审稿时长
39 weeks
期刊介绍: The New Zealand Journal of Forestry Science is an international journal covering the breadth of forestry science. Planted forests are a particular focus but manuscripts on a wide range of forestry topics will also be considered. The journal''s scope covers forestry species, which are those capable of reaching at least five metres in height at maturity in the place they are located, but not grown or managed primarily for fruit or nut production.
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