The Productivity of One Continuous Clearcutting and Reforestation Operation with the Vehicle Logging System on Moderate Slopes in Nagano Prefecture

Oya, Shinjiro; Saito, Masashi; Shirota, Tetsuoh; Otsuka, Dai; Miyazaki, Takuro; Yanagisawa, Nobuyuki; Kobayashi, Naoki

doi:10.4005/jjfs.98.233

Cited by 5 publications

(4 citation statements)

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“…In contrast, medium and large amounts of retention increased felling and pre-hauling time. In Japan, felling cycle times with chainsaws were longer in thinning than in clearcutting because of the time needed to handle hung-up trees [21,22]. Similar to the thinning operation, dispersed retention may cause harvesting trees to hang up in retained trees.…”

Section: Discussionmentioning

confidence: 99%

“…The operation system used in the present study is one of the common ground-based logging methods implemented in Japan [23]. In this system, felling and pre-hauling account for 10%-40% of the total cost to roadside [22,24]. The remaining cost stems from operations conducted at strip roads or landings; thus, it is not affected by tree retention.…”

Section: Discussionmentioning

confidence: 99%

“…In the statistical analyses, we used analysis of covariance (ANCOVA) with time consumption per harvested volume (min/m 3 ) as a response variable (dependent variable) and harvest treatment (clearcutting, and three levels of dispersed retention), average stem volume of harvested fir and contractor as explanatory variables (independent variables). Stem volume was used as a covariate because harvesting productivity is most affected by tree size [20][21][22][23]. We also used contractors as an explanatory variable because time consumptions for felling and pre-hauling are known to differ between contractors [16,24].…”

Section: Harvesting Productivity and Costmentioning

confidence: 99%

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Productivity and Cost of Retention Harvesting Operation in Conifer Plantations

Tsushima

Watanabe

Akashi

2023

Forests

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Retention forestry is a harvesting system that intentionally retains important forest structures at harvest time. We examined the effect of dispersed retention on the productivity and cost of harvesting operations in a large-scale field experiment in conifer plantations in Hokkaido, Japan. For dispersed retention, we retained broad-leaved trees in three levels (10, 50, or 100 trees/ha). We used daily operator reports and investigated time consumption (h/m3) of felling and pre-hauling operations and the total cost to roadside. Compared with clearcutting, mean felling time was 7% and 17% longer, and mean pre-hauling time was 20% and 19% longer in 50 and 100 retained trees/ha, respectively. The other operations were not affected by tree retention because they were conducted at pre-existed strip roads or landings where no trees were retained. Increased time consumption caused an increased cost of felling and pre-hauling. Compared with clearcutting, the combined cost of felling and pre-hauling was 14% and 18% higher in 50 and 100 retained trees/ha, respectively. However, the total cost to roadside increased only by 3% compared with clearcutting because these two operations in total occupied 19% of the overall cost, and the cost of the other operations was not affected by tree retention. This suggests that the impact of tree retention on the total cost was small and that the harvesting system used in the present study can reduce cost increment due to tree retention unless trees are not retained on strip roads.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Harvesting Productivity and Costmentioning

confidence: 99%

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Productivity and Cost of Retention Harvesting Operation in Conifer Plantations

Tsushima

Watanabe

Akashi

2023

Forests

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“…Equation ( 12) can be applied to both serial and parallel models. In Japan the CLP is referred to as system labor productivity and it has been used in many studies there [10,12,[34][35][36][37][38][39][40][41][42][43][44]. As with the CMP, the PMH or PSH can be used as a unit of productivity instead of using the unit of m 3 /h.…”

Section: Combined Labor Productivitymentioning

confidence: 99%

Assessing the Productivity of Forest Harvesting Systems Using a Combination of Forestry Machines in Steep Terrain

Yoshimura

Suzuki

Sato

2023

Forests

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Despite similarly steep terrain, the productivity of forest harvesting operations in Japan is lower than in Central Europe. Harvesting systems in Japan are typically characterized by the four production processes of felling, yarding, processing, and forwarding, whereas in Central Europe they have mostly been reduced to just two through the use of a PTY (Processor Tower Yarder). This study investigated the number of production processes as a reason for the relatively lower productivity of forest harvesting in Japan using the Combined Machine Productivity (CMP) and Combined Labor Productivity (CLP) indices. The CMP and CLP were 1.81 m3/h and 0.45 m3/worker/h, respectively, for a parallel production model based on a typical Japanese forest harvesting system in Japan. The CMP and CLP values were improved to 2.51 m3/h and 0.63 m3/worker/h, respectively, when the forwarding process was removed from the model. The CMP and CLP values were further improved to 3.04 m3/h and 0.76 m3/worker/h, respectively, when yarding and processing were integrated into a single process. Reducing the number of the production processes can therefore improve the productivity of forest harvesting operations in Japan.

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