Effects of Boom-Corridor and Selective Thinnings on Harvester Productivity in Dense Small Diameter Pyrenean Oak (Quercus pyrenaica Willd.) Coppices in Spain

IF 2.7 2区 农林科学 Q1 FORESTRY
Lucía Herguido-Sevillano, E. Tolosana, R. Laina, Teresa de la Fuente, Dan Bergström, Raul Fernandez-Lacruz, Thomas Nordfjell
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Abstract

Due to socioeconomic transformations in the 20th century, Quercus pyrenaica Willd. coppices in Spain, as well as other European coppices, have experimented an abandonment and lack of intervention leading to stagnant high density stands with fragile health due to competition. Thinnings are often required to ensure their stability and health, producing forest products such as firewood or biomass, which are key energy sources in a carbon-neutral economy. However, thinnings are seldom performed because they lack economic sustainability due to a low productivity, high costs and low biomass prices. In this study, two thinning methods, selective thinning (ST) and boom-corridor thinning (BCT), were tested carrying out a time study in a high-density small-diameter Q. pyrenaica stand in the León province (Castilla y León, Spain) with a forest harvester base machine, on which an accumulating felling head Bracke C16c was mounted. The residual stands were significantly different regarding the final density (greater in BCT) and the final average DBH (bigger in ST), while thinning intensity (odt·ha-1) was the same. In most work elements, time per tree was not significantly different. BCT showed a significant 48.6% increase in harvester productivity when compared to ST, with averaging 4.43 and 2.99 odt·pmh-1, respectively, due mainly to the average weight per extracted tree, 42% greater in BCT. When considering the common range of unit tree weight, the productivity was 16–23% greater for BCT, far less than observed in the trials. These results show the potential of BCT over ST in the studied conditions, although there is room for improvement. Further studies could include the future evolution of the treated stands and perform a cost analysis.
西班牙密集小径比利牛斯橡树(Quercus pyrenaica Willd.)
由于 20 世纪的社会经济转型,西班牙的栎树灌木林以及欧洲的其他灌木林都经历了被遗弃和缺乏干预的阶段,导致高密度林分停滞不前,健康状况因竞争而变得脆弱。为了确保林分的稳定和健康,通常需要进行间伐,以生产木柴或生物质等林产品,这些都是碳中和经济中的重要能源。然而,由于生产率低、成本高和生物质价格低,疏伐缺乏经济可持续性,因此很少进行。在这项研究中,对莱昂省(西班牙卡斯蒂利亚-莱昂)的高密度小径桉树林进行了时间研究,测试了两种间伐方法,即选择性间伐(ST)和围栏-走廊间伐(BCT)。残留林分在最终密度(BCT 较大)和最终平均 DBH(ST 较大)方面存在明显差异,而疏伐强度(odt-ha-1)则相同。在大多数工作要素中,每棵树的工作时间没有明显差异。与 ST 相比,BCT 显著提高了 48.6% 的采伐生产率,平均采伐量分别为 4.43 和 2.99odt-pmh-1,这主要归功于每棵采伐树的平均重量,BCT 高出 42%。如果考虑到常见的单位树重范围,BCT 的生产率要高出 16-23%,远低于试验中观察到的结果。这些结果表明,在所研究的条件下,BCT 比 ST 更具潜力,但仍有改进的余地。进一步的研究可以包括经处理林分的未来演变,并进行成本分析。
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来源期刊
CiteScore
5.20
自引率
12.50%
发文量
23
审稿时长
>12 weeks
期刊介绍: Croatian Journal of Forest Engineering (CROJFE) is a refereed journal distributed internationally, publishing original research articles concerning forest engineering, both theoretical and empirical. The journal covers all aspects of forest engineering research, ranging from basic to applied subjects. In addition to research articles, preliminary research notes and subject reviews are published. Journal Subjects and Fields: -Harvesting systems and technologies- Forest biomass and carbon sequestration- Forest road network planning, management and construction- System organization and forest operations- IT technologies and remote sensing- Engineering in urban forestry- Vehicle/machine design and evaluation- Modelling and sustainable management- Eco-efficient technologies in forestry- Ergonomics and work safety
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