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Comparison of the productivity, cost and stem breakage of two- and three-machine harvest systems clearfelling a mature Pinus radiata stand
Australian Forestry ( IF 2.1 ) Pub Date : 2020-04-02 , DOI: 10.1080/00049158.2020.1775379
M. Strandgard 1 , R. Mitchell 1
Affiliation  

ABSTRACT Damage to trees and logs during harvest and transport can result in major losses of wood volume and value. The study compared a harvester/forwarder (two-machine) harvest system, which typically is used in Australia, with a feller-buncher/processor/forwarder (three-machine) harvest system in terms of productivity, cost and felling stem breakage when clearfelling a 29-year-old Pinus radiata plantation in eastern Victoria, Australia. The study aimed to determine whether the three-machine harvest system reduced felling tree breakage while maintaining or improving on the productivity and delivered cost of the two-machine harvest system. The harvest systems were compared on adjacent sites (~1 ha each) using an elemental time study. Machine productivity was derived from cycle times using StanForD stem files to obtain merchantable tree volumes and forwarder load weights from the forwarder’s onboard scales. The three-machine harvest system was more productive and resulted in considerably less felling stem breakage than the two-machine harvest system (two broken stems compared with 21 broken stems). However, it was approximately 41% more expensive than the two-machine harvest system in terms of cost per m3 of logs delivered to roadside. Because chiplogs were cut from broken stem sections where possible, and it was unlikely that sawlog volume was lost through stem breakage (based on the minimum sawlog specifications and the length and large-end diameter of the broken stem sections), any financial losses resulting from the additional breakage in the two-machine harvest system were insignificant compared with the extra cost per m3 of logs delivered for the three-machine harvest system.

中文翻译:

两机和三机采伐系统对成熟辐射松林分的生产力、成本和茎折率的比较

摘要 在采伐和运输过程中对树木和原木的损坏会导致木材体积和价值的重大损失。该研究比较了澳大利亚通常使用的收割机/运输机(两机)收获系统与伐木堆垛机/加工机/运输机(三机)收获系统的生产率、成本和伐木时的伐木断裂情况澳大利亚维多利亚州东部一个有 29 年历史的辐射松种植园。该研究旨在确定三机收割系统是否减少了砍伐树木的破损,同时保持或提高了两机收割系统的生产力和交付成本。使用元素时间研究在相邻地点(每个约 1 公顷)比较了收获系统。机器生产力来自使用 StanForD 茎文件的循环时间,从货运代理的车载秤获得可销售的树木体积和货运代理负载重量。三机收割系统的生产力更高,并且比两机收割系统(两个断茎与 21 个断茎相比)导致的伐木断茎少得多。然而,就每立方米输送到路边的原木成本而言,它比两机收割系统贵约 41%。因为木屑原木尽可能从断茎部分切下,并且不太可能因茎断裂而损失锯木体积(基于最小锯木规格和断茎部分的长度和大端直径),
更新日期:2020-04-02
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