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Kambijeve aktivnosti in nastanek lesa pri bukvi s Panške reke : diplomsko delo - visokošolski strokovni študij
Beber, Marko (Author), Čufar, Katarina (Mentor) More about this mentor... This link opens in a new window, Gričar, Jožica (Co-mentor)

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Abstract
V letu 2006 so bili tekom rastne sezone v tedenskih razmakih odvzeti vzorci lesa, kambija in skorje iz 6 odraslih bukev (Fagus sylvatica L.) s Panške reke pri Ljubljani. Na mikroskopskih preparatih prečnih prerezov tkiv so s pomočjo svetlobnega mikroskopa opazovali, kako se je od aprila do septembra 2006 spreminjala širina kambijeve cone in kako je nastajala branika v lesu in floemu v drevesih številka 5 in 6. Celice lesa so začele nastajati med 18. in 24. aprilom 2006. To je sovpadalo z olistanjem dreves. Prve zrele celice lesa,kjer je bila zaključena debelinska rast in lignifikacija celične stene, so opazili 8 tednov po njihovem nastanku v kambiju. Okoli 20. junija so v lesu lahko jasno razločili rani in kasni les. Nastajanje novih celic lesa se je zaključilo konec julija oz. v začetku avgusta. Konec avgusta je bil razvoj vseh celic popolnoma končan. V mirujoči kambijevi coni so v radialnem nizu zabeležili 3 do 5 celic, v kambijevi coni na višku aktivnosti (med 25. aprilomin 2. majem 2006) pa 10 do 13 celic. Na preparatih prečnih prerezov je bil viden tudi razvoj branike v floemu. V razpravi so ovrednotili pomen rezultatov za gozdarsko prakso.

Language:Slovenian
Keywords:Fagus sylvatica, bukev, nastanek lesa, kambij
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2012
Publisher:[M. Beber]
Number of pages:IX, 58 f.
Place:Ljubljana
UDC:630*81
COBISS.SI-ID:3400102 This link opens in a new window
Views:980
Downloads:342
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Secondary language

Language:Unknown
Abstract:
Samples of wood, bark and cambium from six adult beech trees (Fagus sylvatica L.) were collected at weekly intervals throughout the 2006 growing season. The selected sampling trees originated from the forest at Panška reka, near Ljubljana. The tissue cross-sections were observed under the light microscope.On the tissues taken from April until September 2006 the changing width of cambial zone and the formation of the tree ring in wood and in phloem were recorded. In the trees No. 5 and No. 6 the first formed cells occurred in the wood between 18 and 24 April 2006. This coincided with general leaf unfolding of the trees. First mature cells, with completed radial growth and cell wall lignification, were observed 8 weeks after their formation in the cambium. On 20 June it was possible to clearly differentiate early and late wood. Formation of new cells of wood ended in late July or in early August. The development of all cells was completed at the end of August.The dormant cambial zone contained 3 to 5 cells in a radial row. At thepeak of the cambial activity (between 25 April and 2 May 2006) the cambial zone consisted of 10 to 13 cells. The development of phloem ring could be observed on cross sections as well. Finally, the importance of the obtained results for forestry practice is presented.


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