期刊
EUROPEAN JOURNAL OF FOREST RESEARCH
卷 140, 期 2, 页码 345-354出版社
SPRINGER
DOI: 10.1007/s10342-020-01335-y
关键词
Multi-tree handling (MTH); Logging; Felling; Forwarding; Productivity; Cost efficiency
类别
资金
- Bio Based Industries Joint Undertaking under the European Union [745874]
- Polish Ministry of Science and Higher Education's programme: Regional Initiative Excellence [005/RID/2018/19]
- Ministry of Science and Higher Education
The study suggests that in European short-rotation plantations, using a multi-stem handling mode can increase harvesting productivity. The multi-stem handling system is capable of keeping harvesting costs below 15 euros per green ton, while meeting the requirements for value recovery and log quality specifications.
Small tree size represents the main challenge when designing a cost-effective harvesting system for European short-rotation plantations. This challenge is further complicated by the need to obtain 4-m logs for high-end products, which rules out the possibility of deploying whole-tree chipping. Both challenges can be met through mass or multi-tree handling (MTH), which must begin at the time of felling and continue uninterrupted along the whole supply chain. The objective was to: (1) gauge the productivity and the cost of CTL harvesting applied to these plantations; (2) assess log yield and capacity to match dimensional specifications; (3) determine if MTH applied to CTL technology offers a real benefit compared with conventional single-tree handling. The authors conducted a time study using a block design with a two-machine cut-to-length harvesting system (i.e. harvester and forwarder) in single- and multi-tree handling operations on the clear cutting of a hybrid poplar plantation in Poland, as well as we manually measured the produced volumes of the study. Higher productivity (+ 8%) was achieved under the multi-stem handling mode. The MTH system proved capable of containing harvesting costs below euro 15 per green ton, while fulfilling set timber quality requirements in terms of value recovery and log quality specifications. A new, software-based, MTH system is recommended to be used in short-rotation poplar plantation for logs and biomass harvesting. When the coppicing season is over, the system can be deployed for the conventional thinning operations.
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