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Root system morphology of bare root and containerized beech and oak plants
Becher, Vladimír ; Kupka, Ivo (advisor) ; Bílek, Lukáš (referee)
The thesis follows the bachelor thesis on comparison of morphological and economic parameters of various types of seedlings, which resulted in the planting of containerized and bare root seedlings of the European beech (Fagus sylvativa Linne) and the English oak (Quercus robur Linnaeus) in a forest regeneration in September 2011 and April 2012.
The measurement of the height and thickness of the root neck of the seedlings was carried out on designated plots in March 2015. I also investigated possible mortality from the afforestation inspection in July 2012. Furthermore, 154 seedlings, 84 containerized seedlings a 70 bare root seedlings, in order to evalutate the development of the root system, its possible deformation and subsequently detection of the volume by using xylometric method. The data collected in the field were processed into tables and compared with the results observed in the bachelor thesis.
The average figures for the height, the thickness of the root neck and the volume of the root system showed almost identical development of bare root and containerized seedlings in the forest cover, even though the figures of individual seedlings were highly variable. When reviewing the development of the root system, I found unacceptable deformation of the main taproot at 25% containerized seedlings and 20% bare root seedlings. The remaining seedlings were without deformation or with acceptable deformation of the taproot (wavy taproot, unbalanced taproot with the axis in the above-ground part, an outgrowth).
It was discovered that containerized seedlings were more easily removable from the ground, the seedlings were not sufficiently fixed in the ground and its root system was in some cases less developed than it was with bare root seedlings. This may be influenced by several factors, e.g. the influence of richness of the root system on fine roots, the obstruction of development of the root system by cementing the surrounding soil when using the slit method.
The bare root seedlings, the English oak in particular, showed root development to a greater depth, which is very important not only for sealing but also as an important factor in the drought season and extreme summer temperatures when there is rapid exhaustion of the moisture in the upper horizon of the soil due to the vapor.
Unfortunately, it was not possible to verify these findings in a larger sample size, as there had been major damage of the forest.
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