Vývoj růstu tisu červeného na výzkumné ploše Líska v severních Čechách do věku 19 let

The paper summarizes results of three periodic evaluations of growth characteristics of the European yew in the research plot established in 2006 at the locality Líska in the Lusatian Mountains. Biometric measurements (height, basal diameter, d.b.h.) and other assessments (sex, needle colour, and vitality) were performed with a 5-year period in 2008, 2013 and 2018. Additional research is focused on the possibility of increasing the quality of the yew trees through shaping cut. At the age of about 18–19 years, the losses in the site are minimal, the height of yews ranges on average from 2.5 to 3 m, the diameter at breast high of the yew trees ranges from 3 to 4 cm. Earlier, male individuals began to mature. Overall, 71% of yews have become sexually mature so far in a ratio of 1:1.3 in favour of males. Pruning demonstrably leads to an increased economic quality, while it seems that the season for its implementation is not so important.