| Name of article: | Analýza neevidovaného objemu dříví v přídavcích k délce výřezů při výrobě smrkového dříví harvestorovou technologií |
|---|---|
| Number: | 4 |
| Year: | 2019 |
| Author: | Radim Löwe, Monika Sedmíková, Pavel Natov, Jiří Dvořák, Martin Jankovský |
The CTL logging method, linked to the harvester technology, has an increasing share on the total annual felling in the Czech Republic. The aim of our study was to determine the relative share of unrecorded volume in length allowances on the total volume of merchantable timber, as produced by harvesters. We also analyzed the volume differences in length allowances in assortment groups. Data were gathered from *.STM files, 221 235 spruce logs were evaluated. The total volume of unrecorded timber in length allowances of merchantable assortments represented 2.19% of the total recorded timber volume. After dividing the logs into individual assortment groups, we found that in the groups Roundwood and Aggregate, the average relative volume in length allowances ranged from 2.41% to 2.43%, while in the group Pulpwood was only 1.22%. Significant differences between the relative timber volumes in length allowances were also found in individual groups of assortments after categorization of logs according to their nominal length and midspan diameter. In the groups Roundwood and Pulpwood, we found significantly lower relative timber volumes in length allowances for butt logs compared to other logs. The results can be used for estimation of unrecorded timber volume in length allowances to supplement forest management records
