| Name of article: | Růst proveniencí borovice pokroucené v podmínkách acidofilní doubravy v západních Čechách ve věku 34 let |
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| Number: | 3 |
| Year: | 2017 |
| Author: | Petr Novotný, Martin Fulín, Jaroslav Dostál, Jiří Čáp, Josef Frýdl, Jan Liška, Jan Kaňák |
The aim of this paper is to evaluate 35 lodgepole pine provenances in a long-term research provenance plot in the Arboretum Sofronka in Plzeň–Bolevec. This provenance plot belongs to the research trial established in the Czech Republic in 1983, on three separate locations with different site conditions. At the age of 34 years, the plot was measured and evaluated both quantitatively (height, DBH, stem volume) and qualitatively (health status, stem form, branch thickness, bark type). In the case of height growth measurement, results were compared with previous results observed at the plot. In total 1,907 trees were evaluated. Differences in height and DBH growth characteristics of evaluated provenances were statistically significant. For height and DBH, the median values were 13.2 m and 12.5 cm respectively. In the case of volume production, a median value of 0.068 m3 was calculated. Average defoliation was 29%. Statistically significant differences of quantitative characteristics were found between subspecies. Low mortality was found in case of some P. c. subsp. latifolia provenances, while higher mortality was often identified for provenances of P. c. subsp. murrayana. Branches of pine trees were usually thinner, stem form was characterised mostly as one way curved, with scaly bark. Stem forking was registered in case of 668 trees.
