11. Effects of climate on Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) growth Southeast of the European AlpsTom Levanič, Hana Štraus, 2022, izvirni znanstveni članek Povzetek: Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) is a non-native tree species in Slovenia with the potential to partially replace Norway spruce in our native forests. Compared to spruce, it has several advantages in terms of volume growth, wood quality and tolerance to drought. This is important given the changing climate in which spruce is confronted with serious problems caused by increasing temperatures and drought stress. At three sites (one on non-carbonate bedrock and deep soils, and two on limestone with soil layers of varying depths), 20 Douglas-fir and 20 spruce per site were sampled in order to compare their radial growth response to climate and drought events. The radial growth of Douglas-fir exceeds that of spruce by about 20% on comparable sites. It is more responsive to climate than spruce. Above-average temperatures in February and March have a significant positive effect on the radial growth of Douglas-fir. In recent decades, above-average summer precipitation has also had a positive influence on the radial growth of Douglas-fir. Compared to spruce, Douglas-fir is less sensitive to extreme drought events. Our results indicate that Douglas-fir may be a good substitute for spruce in semi-natural managed forest stands in Slovenia. The planting of Douglas-fir should be allowed in Slovenian forests, but the proportion of it in forest stands should be kept lower than is the case with spruce today.
Ključne besede: climate change, climate response, drought, radial increment, dendrochronology
Objavljeno v DiRROS: 15.06.2022; Ogledov: 544; Prenosov: 455
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12. Jet stream position explains regional anomalies in European beech forest productivity and tree growthIsabel Dorado Liñán, Blanca Ayarzagüena, Flurin Babst, Guobao Xu, Luis Gil, Giovanna Battipaglia, Allan Buras, Vojtěch Čada, Jesús J. Camarero, Liam Cavin, Tom Levanič, Peter Prislan, 2022, izvirni znanstveni članek Povzetek: The mechanistic pathways connecting ocean-atmosphere variability and terrestrial productivity are well-established theoretically, but remain challenging to quantify empirically. Such quantification will greatly improve the assessment and prediction of changes in terrestrial carbon sequestration in response to dynamically induced climatic extremes. The jet stream latitude (JSL) over the North Atlantic-European domain provides a synthetic and robust physical framework that integrates climate variability not accounted for by atmospheric circulation patterns alone. Surface climate impacts of north-south summer JSL displacements are not uniform across Europe, but rather create a northwestern-southeastern dipole in forest productivity and radial-growth anomalies. Summer JSL variability over the eastern North Atlantic-European domain (5-40E) exerts the strongest impact on European beech, inducing anomalies of up to 30% in modelled gross primary productivity and 50% in radial tree growth. The net effects of JSL movements on terrestrial carbon fluxes depend on forest density, carbon stocks, and productivity imbalances across biogeographic regions.
Ključne besede: atmospheric dynamics, climate-change ecology, climate-change impacts, environmental impact
Objavljeno v DiRROS: 20.04.2022; Ogledov: 725; Prenosov: 605
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13. Priraščanje navadne smreke (Picea abies (L.) Karst.) in evropskega macesna (Larix decidua Mill.) na nekdanjih novinah v Koprivni v KaravankahJanez Golob, Tom Levanič, David Hladnik, 2021, izvirni znanstveni članek Povzetek: Na podlagi meritev v obdobju 1962–2017 smo na raziskovalnih ploskvah na nekdanjih novinah v katastrski občini Koprivna izračunali debelinske, višinske in volumenske prirastke za najpomembnejši drevesni vrsti - smreko in macesen. Na raziskovalnih ploskvah, ki so bile prepuščene naravnemu razvoju, so srednjetemeljnični premeri manjši, število dreves pa večje od tistih v primerljivih gospodarskih gozdovih. V zadnjih tridesetih letih se je zaradi visokih sestojnih gostot zmanjšalo debelinsko priraščanje dreves smreke in macesna. Z dendrokronološko analizo smo ocenili vpliv klimatskih dejavnikov na priraščanje smreke in macesna. Na podlagi dendrokronološke analize smo ugotovili, da se leta z negativnim odzivom dreves v debelinskem prirastku od leta 1984 pojavljajo pogosteje.
Ključne besede: raziskovalne ploskve, smreka, macesen, debelinski prirastek, volumenski prirastek, indeks gostote SDI, dendrokronološka analiza
Objavljeno v DiRROS: 02.12.2021; Ogledov: 3150; Prenosov: 1899
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15. Stabilni izotopi v gozdnem ekosistemu - analizne metode in uporabaSaša Zavadlav, Grega E. Voglar, Polona Hafner, Mitja Ferlan, Tom Levanič, 2016, objavljeni povzetek znanstvenega prispevka na konferenci Ključne besede: stabilni izotopi, masna spektrometrija, laserska absorpcijska spektroskopija, EA-IRMS, OA-ICOS
Objavljeno v DiRROS: 03.11.2021; Ogledov: 748; Prenosov: 265
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16. SciVie - Sciences de le Vie from the past and for the future : [presented at European Forest Research and Innovation, 1st ex post evaluation programme, Ljubljana, 19. 1. 2016]Maja Peteh, Irena Rebov, Tina Drolc, Žiga Lipar, Tom Levanič, Hojka Kraigher, 2016, prispevek na konferenci brez natisa Objavljeno v DiRROS: 03.11.2021; Ogledov: 1153; Prenosov: 387
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