The Profitability of Cross-Cutting Practices in Butt-Rotten Picea abies Final-Felling Stands
| Autor: | Kalle Kärhä, Teijo Palander, Mikko Räsänen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Softwood productivity Heterobasidion annosum Felling 01 natural sciences decay heterobasidion annosum Mathematics 040101 forestry value recovery biology Pulpwood sawlog Forestry Picea abies 04 agricultural and veterinary sciences lcsh:QK900-989 biology.organism_classification Cross cut Time and motion Cross-cutting offcut lcsh:Plant ecology 0401 agriculture forestry and fisheries 010606 plant biology & botany |
| Zdroj: | Forests, Vol 10, Iss 10, p 874 (2019) Forests Volume 10 Issue 10 |
| ISSN: | 1999-4907 |
| Popis: | Research Highlights: This study offers new information on the cross cutting of decayed stems with the sounding of short (0.5 m) offcuts and the bucking of longer (3.0 m) butt-rotten poles. Background and Objectives: The root and butt-rot fungus Heterobasidion annosum sensu lato (Fr.) Bref. causes wood quality damage to trees in softwood forests. When timber is harvested in butt-rotten forests, it is essential that the decayed part of the tree is recognized and cut away from a stem, while the healthy and good quality log section of a stem is cross cut with precision sawlogs. The objective of the study was to investigate the impact of two off-cutting methods on stem processing time, cutting productivity, sawlog volume, and commercial value at the roadside landing when harvesting timber from the butt-rotten Norway spruce (Picea abies (L.) Karst.) final-felling forests. Materials and Methods: The length of the short offcuts used was 0.5 m. The results of the cross-cutting practices were compared to the decayed pulpwood poles of 3 m from the butt of the rotten stems. Time and motion studies were carried out in stands before the profitability calculations. The study data consisted of 1980 Norway spruce sawlog stems. Results: Sounding of the short offcuts added significantly to the stem processing time of butt-rotten stems, but the sawlog volume and the timber value recovery of the stems were higher than those of the decayed pulpwood poles of 3 m. Conclusions: The study concluded that sounding of butt-rotten Norway spruce stems with one to three offcuts is economically profitable if the diameter of the decayed column at the stem stump&rsquo s height is small (&le 5 cm). In contrast, when the width of the decay is larger (> 5 cm), it is more profitable to first cross cut the decayed pulpwood pole of 3 m and then to observe the height of the decayed part of the stem. |
| Databáze: | OpenAIRE |
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