doktorska disertacija
Polona Hafner (Author), Aleš Kadunc (Reviewer), Tom Levanič (Mentor), Nives Ogrinc (Thesis defence commission member)

Abstract

Na območju jugozahodnih Alp so kronologije izotopskega razmerja ogljika, kisika in vodika v branikah macesna tesno povezane, v najmočnejši korelaciji sta kronologiji vodnih izotopov. Kronologije širin branik vsebujejo informacijo o klimatskih razmerah v obdobju od sredine maja do julija, kronologije izotopskega razmerja pa so v močni korelaciji s temperaturami in trajanjem sončnega obsevanja v juliju in avgustu. Prostorski vzorec korelacije med izmerjenimi temperaturami ter kronologijama izotopskega razmerja ogljika in širine branik se razteza čez širše območje Alp. Pri kronologijah vodnih izotopov vzorec prostorske korelacije pokriva območje južne Italije in zahodnega dela Balkana. Na podlagi kronologije izotopske sestave ogljika je bila izdelana 520 let dolga rekonstrukcija trajanja sončnega obsevanja. Njena primerjava z obstoječimi rekonstrukcijami temperatur razkriva obdobja sinhronega variiranja in razhodov krivulj trajanja sončnega obsevanja in temperatur. V Krakovskem gozdu so dobi s periodično poplavljenega mikrorastišča (W dobi) skozi celotno analizirano obdobje (1970-2008) rasli značilno bolje kot dobi iz bolj suhega mikrorastišča (D dobi). Pri D dobih je potencialna klimatska informacija shranjena v ranem lesu in se nanaša na klimatske razmere v preteklem letu. V kasnem lesu ni razvidnega odziva na okoljske dejavnike oziroma je le-ta zabrisan v odzivu dreves na dolgotrajne stresne razmere. Visoka pozitivna korelacija parametrov kasnega lesa W dobov s poletno količino padavin in poletnim pretokom Krke nakazuje potencial za njihovo uporabo v dendrohidroloških študijah.

Keywords

dob;macesen;Quercus robur;Larix decidua;dendroklimatologija;dendroekologija;rekonstrukcija;Krakovski gozd;Alpe;izotopska sestava;izotopi;trajanje sončnega obsevanja;rečni pretok;

Data

Language: Slovenian
Year of publishing:
Typology: 2.08 - Doctoral Dissertation
Organization: UL - University of Ljubljana
Publisher: [P. Hafner]
UDC: 630*18(497.4)(043.3)=111=163.6
COBISS: 842359 Link will open in a new window
Views: 343
Downloads: 66
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: ǂThe ǂinfluence of climatic parameters on the isotopic composition and structure of European larch (Larix decidua MIill.) and Penduculate oak (Quecus Robur L.) tree-rings
Secondary abstract: Carbon, oxygen and hydrogen isotope chronologies of tree-rings of larch growing in southeastern Alps are strongly correlated, with correlation between water isotopes being the strongest. Chronologies of tree-ring width contain information of climate conditions in the period between May and July, while isotope chronologies are strongly correlated with temperatures and sunshine duration in July and August. Spatial correlation pattern between carbon isotope chronology, tree-ring width chronology and measured temperatures spreads over wider area of Alps, while in case of water isotopes it covers the area of southern Italy and western Balkan. A 520 years long reconstruction of sunshine duration was constructed based on carbon isotope chronology. Its comparison with existent temperature reconstructions reveals period when temperature and sunshine duration covariate and when they diverge. In the Krakovo forest, pedunculated oaks from peridicaly flooded micro-location (W oaks) grew significantly better than oaks from the drier micro-location (D dobi) through the whole analysed period (1979-2008). In D oak, potential climate information is stored in earlywood and is correlated with climate conditions in the previous year. There was no clear response to environmental factors in the latewood and it appears to be blurred by the response of trees to long term stressed conditions. High positive correlation between summer precipitation amount, summer Krka River flow and latewood parameters of W oaks indicates their potential for use in dendrohydrological studies.
Secondary keywords: Quercus robur;Larix decidua;dendroclimatology;dendroecology;reconstruction;Krakovo forest;Alps;isotopic composition;isotopes;sunshine duration;river flow;
URN: URN:NBN:SI
Type (COBISS): Doctoral dissertation
Thesis comment: Univ. v Ljubljani, Biotehniška fak.
Pages: IX f., 120 f., [3] f. pril.
ID: 12317896