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Poškodbe mladih sadik navadnega divjega kostanja (Aesculus hippocastanum L.) zaradi sončevega ožiga : diplomsko delo - univerzitetni študij
Žitnik, Denis (Author), Oven, Primož (Mentor) More about this mentor... This link opens in a new window

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Abstract
Pri pregledu zdravstvenega stanja drevoreda navadnih divjih kostanjev (Aesculus hippocastanum L.) na Cesti v mestni log v Mestni občini Ljubljana smo opazili številne neprerasle poškodbe na deblih dreves zaradi sončevega ožiga. Za potrebe nadaljnjih raziskav je bilo meseca aprila 2009 iz drevoreda odstranjenih sedem dreves. Drevesa so bila podrobno preiskana, nato pa smo jihrazžagali na kolute iz katerih smo pridobili posamezne vzorce za naše raziskave. Vlažnost lesa smo določili gravimetrično. Vitalnost parenhimskih celic smo dokazovali z jodovico. S pomočjo sistema za analizo slike smo na kolutih izvedli meritve površin živih oz. mrtvih tkiv. Raziskava je pokazala, da je v drevoredu zaradi sončevega ožiga poškodovanih 97 % dreves. Ugotovljenoje bilo, da se pri tovrstnih poškodbah na deblu drevesa pojavljata dva tipa poškodb. Prvi tip poškodbe predstavljajo odprte (neprerasle) rane na deblu, zaradi katerih je les neizogibno podvržen razkroju. Pri drugem tipu poškodbe pa se neprerasle rane pojavljajo v kombinaciji s poškodbami skorje. Poškodbe skorje je mogoče razdeliti na nekaj značilnih morfoloških tipov, ki najverjetneje predstavljajo tudi razvojne faze poškodbe skorje. Obseg poškodovanosti se stopnjuje od krošnje proti bazi drevesa. Delež mrtvega lesa na prečnem prerezu debla je znašal tudi do 60 %. Zaznali smo izjemno visoko variabilnost vlažnosti lesa pri poškodovanih tkivih.

Language:Slovenian
Keywords:sončev ožig, navadni divji kostanj (Aesculus hippocastanum L.), poškodbe dreves, drevo, skorja, les, simptomi
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2010
Publisher:[D. Žitnik]
Number of pages:XI, 55 f.
Place:Ljubljana
UDC:630*42(043.2)=163.6
COBISS.SI-ID:2989734 This link opens in a new window
Views:1079
Downloads:294
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Secondary language

Language:Unknown
Abstract:
When examining the health state of young horse chestnut (Aesculus hippocastanum L.) trees in Cesta v Mestni log street, Municipality of Ljubljana, open sunscorch wounds along the trunks were observed above the ground. In April, 2009 seven trees were cut and the detailed research on the symptoms was carried out to establish the intensity and importance of specificinjuries to the trees. Computer asisted image analysis was used for tree cross section area measurements of infected and non-infected wood tissuesin stem disks. Moisture content of infected and non-infected wood tissues was also measured. According to our observations 97 % of trees in Cesta v Mestni log is affected by sunscorch. Analysis revealed that two typical forms of wounds develop along the tree trunks. The first form developswhen bark and cambium dies and flakes away from wood so open wounds develop. The second form develops when the bark is still attached to the wood but is more or less damaged (cracked). Several different morphological types of bark develop on trunk which probably represents different development stages of bark injuries. Injuries are less common in the crown area but enchase going down the trunk. Infected discolored wood represents as high as 60 % of the cross section area. Extremely high variability is shown in moisture content of infected wood tissues.


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