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Comparison of production and quality of one-story and two-story pine stands on acid soils on 3rd vegetation belt
Sýkora, Jan ; Šálek, Lubomír (advisor) ; Martinisko, Jakub (referee)
The diploma thesis deals with comparison of production of one-story and two-story pine stands on acid soils on 3rd vegetation belt. The thesis provides comparison between two different silvicultural methods for Scotch pine (Pinus sylvestris L.).
The study area was located in central Bohemia, in the Forest Natural Area Křivoklátsko. Investigated forest stands belong to the military forests run by Vojenské lesy a statky, s.p., division Hořovice, forestry office Nouzov.
Using circular sample plots the stock volume and mensuration characteristics were measured and calculated in individual stands. Evaluated characteristics of one-story and two-story stands were compared.
The most important result of the research is the fact that Scotch pine (Pinus sylvestris L.) reaches higher production and higher timber quality in the two-story stands.
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@Potential of brassinosteroids for forest seed and nursery management and for forest regeneration@
Bach, Petr ; Kuneš, Ivan (advisor) ; Švec, Otakar (referee)
Brassinosteroids (BRs) are a class of polyhydroxysteroids that have been recognized as a sixth class of plant hormones. In specific conditions BRs can positively influence the plant growth and development. The first isolated brassinosteroid was natural Brassinolide from rapeseed (Brassica napus L.). Recently BRs are extracted primarily synthetically; they are effective even in very low concentrations. Several studies of different plant species show positive influence of BRs on growth, flowering, germination and resistance to stress factors. Existing scientific studies that deal with BRs impact on plants were predominantly applied on agricultural crops. Until presence, the similar research in forest seed treatment and forest nursery was almost missing. In the Czech Republic the Department of Silviculture of the Faculty of Forestry and Wood Sciences of the Czech University of Life Sciences Prague newly started to deal with the use of BRs in forestry. The aim of this master thesis is to elaborate literature review on BRs and to summarize existing research of their impact on plants. Second part of the thesis solves influence of BRs on Scots pine (Pinus silvestris) seeds germination. Tests are performed in normal and in stress conditions. Results of the practical part show that BRs affect positively seed germination in normal conditions; seeds treated with BRs show higher germination rate than control seeds. Positive impact was not registered when the seeds were exposed to stress factor -- heat. Any research paper showing significant positive influence on forest seedlings in Central European conditions was not published yet.
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Požadavky na dříví borovice při použití ve stavbách
Šimoník, Ladislav
The aim of thesis work was to evaluate the demands on the wood of pine (Pinus sylvetris) used in construction. The work is focused primarily on the use of domestic pine for various elements in the building. Part of the work is measurements that are focused on the influence of defects for subsequent use of pine lumber. For reasons detecting quality requirements have been addressed eleven companies, that are involved in processing of pine or selling of semi-finished pine products. Acquired requirements were used in the own measurement. Percentage of lumber yield without defects was established on their basis. Pine wood is used for production of windows, doors, floors and single-layer solid woods.
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Možnosti uplatnění modifikovaného dřeva ve stavbách
Peterková, Eva
The bachelor thesis summarizes modified wood and describes its use in buildings. The wood has changed physical and mechanical properties. It closer discusses about thermally modified wood because it is the most widespread in the world and also in Czech Republic. It has lower values of mechanical properties, but the thesis shows the possibility of using wood as a construction material in the areas with higher amount moisture content. Measurement confirms change of mechanical properties, especially bending strength, and the results of measurement compression strength show the possibility of use thermally modified wood in areas exposed to pressure.
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Analýza stavu stromů využívaných jako lanové centrum v Rožnově pod Radhoštěm ve srovnání s městským parkem
Dočkalová, Martina
There are many factors that have effect on woody species that grow in the urban area. The goal of this thesis was to find out, whether the rope centre installation has effect on the state of trees. Two locations in Rožnov pod Radhoštěm were selected for the evaluation -- first the rope centre and second the city park, which was used as a reference. 80 trees in total of various species were evaluated visually and 40 specimens of Pinus sylvestris L. were taken using Pressler's drill for the tree-ring analysis. Using this method it was tested, whether the tree used in the rope centre is stressed. Visually were evaluated following characteristics: age class, vitality, health state, stability and perspective of specimens. Using the tree-ring analysis and consecutive evaluation, it wasn't confirmed that installation of the rope centre has negative effect on the wood growth, which is the main indicator of health state and signs of stress.
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