Izvorni znanstveni članak
https://doi.org/10.5552/crojfe.2022.1691
Determining Harvester Productivity Curves of Thinning Operations in Birch Stands of Central Europe
Martyna Rosińska
; Poznań University of Life Sciences (PULS) Faculty of Forestry and Wood Technology Department of Forest Utilisation Wojska Polskiego 71A, 60-625 Poznań POLAND
Mariusz Bembenek
; Poznań University of Life Sciences (PULS) Faculty of Forestry and Wood Technology Department of Forest Utilisation Wojska Polskiego 71A, 60-625 Poznań POLAND
Rodolfo Picchio
; Tuscia University Department of Agriculture and Forest Sciences (DAFNE) Via S. Camillo de Lellis, 01100 Viterbo ITALY
Zbigniew Karaszewski
; Łukasiewicz Research Network – Wood Technology Institute Department of Wood Investigation and Application Winiarska 1, 60-654 Poznań POLAND
Andreja Đuka
; University of Zagreb Faculty of Forestry and Wood Technology Department of Forest Engineering Svetošimunska 23, 10002 Zagreb CROATIA
Piotr S. Mederski
; Poznań University of Life Sciences (PULS) Faculty of Forestry and Wood Technology Department of Forest Utilisation Wojska Polskiego 71A, 60-625 Poznań POLAND
Sažetak
Silver birch (Betula pendula Roth) is a popular tree species forming stands in nearly the whole of Europe. In Poland, birch is one of the most representative broadleaved species growing on rather poor soils, very often as a mix species with Scots pine (Pinus sylvestris L.). In Central Europe, birch forms trunk often with sweeps, and at the older age with thick branches. Due to that, a harvester thinning operation in birch stands can be challengeable when trying to process logs from the top part of trees, which can finally impact on productivity. The objective of this research was to determine harvester productivity for birch with particular attention to production of logs from the top part of a tree. The research was carried out in stands of North and North-West Poland. All together 21 tests were completed in 16 stands, in which 9 harvesters were used (8 different models). The mean diameter of harvested trees was 23.7 cm with the mean height of 21.7 m. Obtained productivity without delays was on average 21.98 m3 h-1 and varied from as low as 5.14 to maximum 44.66 m3 h-1, and depended mainly on harvested tree size. It was also confirmed that top diameter of the last log depended on diameter at breast height (DBH). The model developed based on that relationship can be used for prediction of biomass volume from birch stands when harvesters are used for thinning.
Ključne riječi
harvester head, tree trunk sweep, thick branches, top log diameter, Betula pendula Roth
Hrčak ID:
268010
URI
Datum izdavanja:
3.1.2022.
Posjeta: 682 *