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Iskalni niz: "ključne besede" (dendrochronology) .

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Examination of stable carbon and oxygen isotopic variability in the cellulose and wholewood of Castanea sativa Mill., Fagus sylvatica L., Pinus sylvestris L. and Quercus robur L.
D. McCarroll, G.H.F. Young, N.J. Loader, B. Sladden, 2018

Povzetek: This paper presents results from a comparison of wholewood and cellulose carbon and oxygen isotope ratios for four UK tree species. These species occur within the historic buildings archive as both primary and supplementary construction materials and have been used to reconstruct the climate of the past. New advances in the application of stable isotopes have widened the scope of the isotope approach, but require the time-consuming purification of cellulose. Comparison of the oxygen and carbon isotope signals preserved in the wood and cellulose components confirms and builds upon previous research in this field and provides additional insight into the covariance of these two sample types between species, an
Ključne besede: stable isotopes, tree ring, dendrochronology, dendroclimatology
DiRROS - Objavljeno: 04.02.2019; Ogledov: 1240; Prenosov: 738
.pdf Celotno besedilo (1,63 MB)

The chronology of the silver fir (Abies alba Mill.) from Pohorje, Slovenia
Tom Levanič, Katarina Čufar, 1998

Povzetek: Dendrochronological investigations were made in silver fir (Abies alba Mill.) from Lovrenc, Pohorje, in the NE Slovenia. Tree ring analyses were made in discs of 25 healthy, adult, dominant or co-dominant silver firs and in cores from roof construction of two older rustic buildings from the same region using a LINTAB measuring device nad a TSAP/X of F. Rinn. We constructed the chronology of trees spanning the period of 1785-1996. The chronology of the old house is spanning the period of 1713-1852 and the chronology of barn 1745-1887. It was shown that the last considerable reconstruction of the house roof took place after the end of the growing period of 1952. The dating of the cores containining the outer ring 1887 confirmed the dating based on the carved inscription "1888". The three chronologies were joined into 284 years long silver fir chronology for Pohorje spanning the period of 1713-1996. It was compared with the Slovene silver fir chronology of the Dinaric region. Despite distance and great differences between the two regions there was shown a statistically confirmed similarity of two chronologies with tBP=9.8, GLK=71% and CDI=398. The chronologies have 21 common negative, 21 positive signature years and one common signature interval. Based on this the constructed chronology may be considered as representative for the whole Pohorje. The two chronologies are expected to be a good base to construct a regional Slovene Silver-fir chronology for dating in whole Slovenia. Two Slovene chronologies were compared with the following European silver fir chronologies: South German, stand 1993 (Becker and Siebenlist 1970; Spurk and Friedrich , pers. com.), Bavarian Forest - Germany (Eckstein, Sass 1988), Abetone - Italy (Schweingruber, ITRDB), Bannwald - Switzerland (Schweingruber, ITRDB). Both Slovene chronologies proved to be statistically similar with the two German and the Italian silver fir chronology, but showed no similarity with the Swiss one. The Pohorje chronology correlates better with both German ones and the Dinaric chronology correlates better with the Italian one.
Ključne besede: jelka, Abies alba, datiranje objektov, dendrokronologija, Silver fir, Abies alba, dating of the object, dendrochronology, Slovenia
DiRROS - Objavljeno: 12.07.2017; Ogledov: 1338; Prenosov: 319
URL Celotno besedilo (0,00 KB)
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Green water reconstructed for Rižana watershed, SW Slovenia
Tom Levanič, Urša Vilhar, Simon Poljanšek

Povzetek: In this case study, set in south-west Slovenia, the feasibility of reconstructing green water (the combined amount of evaporated and transpired water in trees and available in the soil) was investigated. In a simplifed scheme, the amounts of green water were calculated as the diference between precipitation and discharge of the Rižana river. Based on the methods of dendroclimatology, the climate signal was tested on black pine (Pinus nigra Arnold) trees growing in the south-western part of the Rižana watershed near the Slovenian sea coast. Results showed that the measured tree-ring parameters of tree-ring width and density are strongly dependent on the amount of green water. The strongest correlation was between available green water in the period May-August and tree-ring width (r=0.61) and latewood width (r=%0.64) (both n=46, p<0.001). The climate signal is signifcant and stable through time, which enabled the reconstruction of green water data into the period before instrumentally measured data. Green water data from the May-August period were extended from 1966 back to 1937 using tree-ring width, and back to 1940 using latewood width. With additional coring of older trees and the extension of existing chronologies, even longer reconstructions could be developed.
Ključne besede: tree-ring width, tree-ring density, dendrochronology, dendroclimatology, reconstruction
DiRROS - Objavljeno: 18.04.2018; Ogledov: 1141; Prenosov: 469
.pdf Celotno besedilo (1003,43 KB)

Stable isotopes reveal climate signal hidden in tree rings of endemic Balkan Pines
Tom Levanič, Jernej Jevšenak, Polona Hafner, 2020

Povzetek: Studies report the good potential of Pinus heldreichii (PIHE) and Pinus peuce (PIPE) for developing long chronologies from living trees and warn that the climate signal is weak in tree-ring widths of PIHE, and particularly PIPE. The goals of the study were to develop long chronologies, and to analyze the climate-growth relationship and potential for long climate reconstructions using tree-ring widths (TRW) and stable carbon isotopes ratios ([delta]13C) in tree rings at the northern edge of species distribution in the eastern part of Montenegro. The PIHE TRW chronology covers the period 1571-2013 (443 years) and the PIPE TRW chronology 1521-2013 (493 years). The temperature signal in PIHE TRW is weak and the precipitation signal is non-existent. PIPE has no climate signal in TRW. Both studied species have very similar [delta]13C chronologies, which allows us to merge isotope chronologies into a single composite [delta]13C Pinus chronology. The composite chronology has a strong signal related to average monthly temperature in June, July, and August and monthly values for cloudiness in July and August, with r > 0.6 and r < -0.6 for individual months, respectively. The climate signal was enhanced when June, July, and August values were merged into seasonal variables. The temporal stability of temperature, precipitation and cloudiness signals is consistent. The spatial extent of the [delta]13C chronology extends over a very large region, including all surrounding countries.
Ključne besede: Pinus heldreichii, Pinus peuce, climate reconstruction, dendrochronology, dendroclimatology, Balkan Peninsula, Bosnian pine, Macedonian pine, Pinus heldreichii H. Christ., Pinus peuce Grisb.
DiRROS - Objavljeno: 20.02.2020; Ogledov: 241; Prenosov: 159
URL Celotno besedilo (0,00 KB)

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