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Dendrokronološke in lesno-anatomske posebnosti različno vitalnih dobov (Quercus robur L.) : magistrsko delo - magistrski študij - 2. stopnja
Jevšenak, Jernej (Author), Levanič, Tom (Mentor) More about this mentor... This link opens in a new window

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Abstract
Razlike med različno vitalnimi skupinami dobov (Quercus robur) so bile ovrednotene v debelinskem priraščanju ter lesno-anatomskih značilnostih. Kronologije širin branik in ranega lesa so bile standardizirane z modificirano negativno eksponentno funkcijo. Velikopovršinska sprememba vodnega režima leta 1982 je pri drevesih iz Cigonce najprej povzročila spremembe v širini branike, širini kasnega lesa ter tudi v parametru "vsota površin trahej". Šele leta 1995 so znaki propadanja vidni tudi v zmanjšanih dimenzijah prevodnih elementov. Skupina "močno propadajoči" iz Cigonce se odziva le na povprečne mesečne in sezonske temperature. Odvisnost je vselej negativna in velja tako za dendrokronološke kot tudi za lesno-anatomske parametre. Skupini "zdravi" in "propadajoči" iz Mlač se odzivajo tako na temperature kot tudi na količine padavin. Lesno-anatomski parametri pri skupini "zdravi" iz Mlač so pokazali večjo odvisnost od temperatur kot dendrokronološki, ki se bolje odzivajo predvsem na junijske padavine. Večje količine dežja pozimi ter spomladi pomenijo manjše prevodne elemente pri skupini "zdravi", a ne vplivajo na skupno površino prevodnega tkiva. Parameter" povprečna površina maksimalne traheje" se je pokazal kot potencialen parameter za rekonstrukcijo povprečnih temperatur od marca do junija.

Language:Slovenian
Keywords:dob, dendrokronologija, dendroklimatologija, Quercus robur, Cigonca, anatomija lesa, Mlače, rekonstrukcija klime, Querco-Carpinetum
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:BF - Biotechnical Faculty
Year:2014
Publisher:[J. Jevšenak]
Number of pages:XI, 65 str., 7 str. pril.
UDC:630*5
COBISS.SI-ID:3816614 Link is opened in a new window
Views:83
Downloads:23
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Secondary language

Language:English
Title:Dendrochronological and wood-anatomical features of differently vital pedunculate oaks (Quercus robur L.)
Abstract:
Differences between differently vital groups of pedunculate oaks (Quercus robur) were determined in diameter increment and wood-anatomical features. Ring-width and latewood chronologies were standardized using modified negative exponential curve. Large-scale drainage manipulation in 1982 in forest stand from Cigonca first caused changes in ring width, latewood and parameter "total vessel area". Not until the year 1995 signs of dieback are also visible in smaller sizes of conductive elements. "Strongly Declining" group from Cigonca is responsive only to the mean monthly and seasonal temperatures. Dependence is strictly negative - for dendrochronological and wood-anatomical parameters. "Vital" and "Declining" groups from Mlače are responsive to the mean temperatures and the sum of precipitations. Wood-anatomical parameters from "Vital" group from Mlače showed higher responsive rate to temperatures than dendrochronological parameters, which are mostly responding to June precipitation. Higher winter and spring precipitation cause smaller conductive elements but do not affect the "total vessel area". Parameter "maximal vessel area" was recognized as a potential parameter for reconstruction of mean temperatures from March to June.


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