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Research Article

Assessment of timber faller working conditions in mixed hand and tethered-machine cut harvest units on steep slopes- A case study in western Oregon

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Pages 408-416 | Received 14 Sep 2022, Accepted 16 Jan 2023, Published online: 06 Feb 2023

Figures & data

Figure 1. Study area map showing new and previous harvest units.

Figure 1. Study area map showing new and previous harvest units.

Table 1. Summary statistics of measured characteristic variables (new and previous harvest units).

Figure 2. Mean (red dot) and median slope (black line inside box) for different falling methods for new harvest units. The dark blue dots represent outliers.

Figure 2. Mean (red dot) and median slope (black line inside box) for different falling methods for new harvest units. The dark blue dots represent outliers.

Table 2. Output statistics from logistic regression analysis (new and previous harvest units).

Figure 3. Boxplot showing mean (red dot) and median slope (black line inside box) for different falling methods for (top) aggregated data and (bottom) individual units [h: hand-felled & m: machine-felled] for previous harvest units. The dark blue dots represent outliers.

Figure 3. Boxplot showing mean (red dot) and median slope (black line inside box) for different falling methods for (top) aggregated data and (bottom) individual units [h: hand-felled & m: machine-felled] for previous harvest units. The dark blue dots represent outliers.

Figure 4. Timber-fallers perception about reasons for the need of hand falling in hand and machine mixed falling operations.

Figure 4. Timber-fallers perception about reasons for the need of hand falling in hand and machine mixed falling operations.

Table 3. Reasons for requiring hand falling for the study units.