Production economics: comparing hybrid tree-length with whole-tree harvesting methods

IF 3 2区 农林科学 Q1 FORESTRY
Forestry Pub Date : 2020-05-14 DOI:10.1093/forestry/cpz065
H. Soman, A. Kizha, Bethany L. Muñoz Delgado, L. Kenefic, K. Kanoti
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引用次数: 17

Abstract

Felled trees with tops and branches are transported to the landing with a grapple skidder in conventional groundbased whole-tree (WT) harvesting. This method has greater potential to damage advance regeneration than those in which trees are processed at-stump. Hybrid tree-length (Hyb TL) harvesting using an stroke-boom delimber for in-woods processing might be a feasible alternative, but little is known about the production economics of this method. An experimental strip-cutting study was conducted in central Maine, US in the winter of 2018 to: (1) evaluate and compare operational productivity and costs of ground-based Hyb TL and WT methods; (2) identify factors influencing productivity of at-stump and at-landing log processing; and (3) calculate best management practice (BMP) implementation costs in WT harvesting. Time-motion data were recorded for operational phases such as felling, extraction, processing, sorting and loading; machine rates were calculated to determine productivity and costs of operations. Total cost of Hyb TL (US $17.01 m−3) was lower than that of WT ($18.38m−3). Processing costwas lower at-stump than at-landing ($2.66 and $2.73m−3 for Hyb TL and WT, respectively). This is likely due to fewer logs handled per cycle at-landing (1.2 logs per turn) compared to the number handled per cycle at-stump (1.4 logs per turn). Sensitivity analysis showed that a 30-m increase in average in-woods distance travelled by the delimber would result in a 41 per cent increase in the processing cost. Cost of BMP implementation in WT was $2.25 m−3 or $59.2 per productive machine hour. Results suggest that it is feasible to apply Hyb TL method in an industrial harvesting operation, though distance of in-woods delimber movement influences processing costs. Insights from this study will help forest managers and loggers efficiently plan and execute harvesting operations.
生产经济学:比较杂交树长与全树采伐方法
在传统的地面全树(WT)采伐中,带顶和树枝的树木被用抓斗滑橇运送到着陆处。这种方法比在树桩处处理的方法有更大的破坏提前再生的潜力。混合树长(Hyb TL)采伐使用冲程-臂定界器进行林中加工可能是一种可行的替代方案,但对这种方法的生产经济学知之甚少。2018年冬季,在美国缅因州中部进行了一项条带切割实验研究,目的是:(1)评估和比较地面Hyb TL和WT方法的操作生产率和成本;(2)识别影响残桩和着陆测井处理生产率的因素;(3)计算最佳管理实践(BMP)在WT收获中的实施成本。记录操作阶段的时间运动数据,如砍伐、提取、加工、分类和装载;计算机器率以确定生产率和操作成本。Hyb TL的总成本(1701万- 3美元)低于WT(1838万- 3美元)。在树桩处的处理成本低于着陆时的处理成本(Hyb TL和WT分别为2.66美元和273万美元)。这可能是由于着陆时每个循环处理的日志(每转1.2条日志)少于树桩时每个循环处理的日志(每转1.4条日志)。敏感性分析表明,划界器在树林内移动的平均距离每增加30米,处理费用就会增加41%。在WT中实现BMP的成本为225万- 3美元,即每台生产机器小时59.2美元。结果表明,在工业采伐作业中应用Hyb TL方法是可行的,但林内划线器移动的距离会影响加工成本。这项研究的见解将有助于森林管理者和伐木者有效地规划和执行采伐作业。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Forestry
Forestry 农林科学-林学
CiteScore
6.70
自引率
7.10%
发文量
47
审稿时长
12-24 weeks
期刊介绍: The journal is inclusive of all subjects, geographical zones and study locations, including trees in urban environments, plantations and natural forests. We welcome papers that consider economic, environmental and social factors and, in particular, studies that take an integrated approach to sustainable management. In considering suitability for publication, attention is given to the originality of contributions and their likely impact on policy and practice, as well as their contribution to the development of knowledge. Special Issues - each year one edition of Forestry will be a Special Issue and will focus on one subject in detail; this will usually be by publication of the proceedings of an international meeting.
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