ABSTRACT Knowing credible records of harvested timber is in the interest of the forest owner, forest entrepreneur and timber-sector stakeholder. Therefore, the objective of the research was to determine the share of unrecorded Norway spruce timber volume in length allowance on the total timber volume produced by harvester technology in Czechia. We analyzed 176,980 merchantable logs (total volume of 10,333 m3) produced by 15 harvesters. Primary data were obtained from .stm files. Logs were categorized into five grades according to metric and qualitative requirements of the customers, also butt logs were distinguished. Statistical analysis were processed in the Statistica 13 package. Results showed that 1.99% of the volume of produced timber were excluded from the primary forestry records. Mean unrecorded volume of length allowance to assortments that contained both the cross-cut and cutting window allowances, varied from 2.99% up to 3.16%, while 0.27% to 0.46% of volume were unrecorded for those assortments that contained only the cutting window. In higher quality grades, we found shorter logs had a higher mean relative volume of length allowance than longer logs. The mean relative volumes of length allowances also varied between butt and other logs.

中文翻译：

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未记录的挪威云杉木材定尺采伐量

摘要了解采伐木材的可靠记录符合森林所有者、森林企业家和木材部门利益相关者的利益。因此，该研究的目的是确定未记录的挪威云杉木材长度在捷克采伐技术生产的木材总量中所占的份额。我们分析了 15 台收割机生产的 176,980 根可销售原木（总体积为 10,333 立方米）。主要数据来自 .stm 文件。原木根据客户的度量和质量要求分为五个等级，并区分了对接原木。统计分析在 Statistica 13 包中进行处理。结果表明，1.99% 的生产木材量被排除在初级林业记录之外。包含横切和切割窗口余量的分类的平均未记录长度余量从 2.99% 到 3.16% 不等，而对于那些只包含切割窗口的分类，未记录体积的 0.27% 到 0.46%。在更高的质量等级中，我们发现较短的原木比较长的原木具有更高的平均相对长度余量。对接原木和其他原木的长度容差的平均相对体积也有所不同。