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Iskalni niz: "ključne besede" (Pinus spp) .

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51.
Annual cambial rhythm in Pinus halepensis and Pinus sylvestris as indicator for climate adaptation
Peter Prislan, Jožica Gričar, Martin De Luis, Klemen Novak, Edurne Martinez Del Castillo, Uwe Schmitt, Gerald Koch, Jasna Štrus, Polona Mrak, Magda Tušek-Žnidarič, Katarina Čufar, 2016

Povzetek: To understand better the adaptation strategies of intra-annual radial growth in Pinus halepensis and Pinus sylvestris to local environmental conditions, we examined the seasonal rhythm of cambial activity and cell differentiation at tissue and cellular levels. Two contrasting sites differing in temperature and amount of precipitation were selected for each species, one typical for their growth and the other represented border climatic conditions, where the two species coexisted. Mature P. halepensis trees from Mediterranean (Spain) and sub-Mediterranean (Slovenia) sites, and P. sylvestris from sub-Mediterranean (Slovenia) and temperate (Slovenia) sites were selected. Repeated sampling was performed throughout the year and samples were prepared for examination with light and transmission electron microscopes. We hypothesized that cambial rhythm in trees growing at the sub-Mediterranean site where the two species co-exist will be similar as at typical sites for their growth. Cambium in P. halepensis at the Mediterranean site was active throughout the year and was never truly dormant, whereas at the sub-Mediterranean site it appeared to be dormant during the winter months. In contrast, cambium in P. sylvestris was clearly dormant at both sub-Mediterranean and temperate sites, although the dormant period seemed to be significantly longer at the temperate site. Thus, the hypothesis was only partly confirmed. Different cambial and cell differentiation rhythms of the two species at the site where both species co-exist and typical sites for their growth indicate their high but different adaptation strategies in terms of adjustment of radial growth to environmental heterogeneity, crucial for long-term tree performance and survival.
Ključne besede: Aleppo pine, Pinus halepensis, Scots pine, Pinus sylvestris, cambium, light microscopy, Mediterranean environment, temporate environment, transmission electron microscopy, xylem
DiRROS - Objavljeno: 12.07.2017; Ogledov: 755; Prenosov: 120
URL Celotno besedilo (0,00 KB)
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52.
Metoda preučevanja sledi iglic terminalnega poganjka
Simon Poljanšek, Primož Oven, Risto Jalkanen, Tom Levanič, 2011

Povzetek: Metoda preučevanja sledi iglic terminalnega poganjka, ali krajše metoda sledi iglic (ang.: needle trace method), retrospektivno beleži starost iglice v trenutku, ko odpade, ter preučuje vpliv okoljskih in biotskih dejavnikov na številne izpeljane podatke, ki temeljijo na ugotovljeni življenjski dobi iglice. Z izvedbo metode pridobimo podatke o dolžini višinskih prirastkov ter številu sledi iglic v posameznih branikah vseh višinskih prirastkov. Z izračunanimi kazalniki je mogoče oceniti fizično stanje krošnje preučevanega drevesa. Metoda je bila razvita na Finskem na rdečem boru (Pinus sylvestris L.), kmalu pa uporabljena tudi na drugih iglavcih. Uporablja se na področju dendrokronologije, gozdne ekologije, patologije in entomologije. V članku avtorji predstavljajo osnovno morfologijo sledi iglic, osnovno idejo metode in njeno uporabnost v okoljskih študijah ter izpeljane kazalnike, kot so relativno število sledi iglic ter zadrževanje, izguba, odmet, starost, dolgoživost, gostota, letni prirast števila in zaloga iglic.
Ključne besede: iglavci, iglice, rdeči bor, Pinus spp., listni aparat, kazalniki, okolje, onesnaževanje, defioliacija
DiRROS - Objavljeno: 12.07.2017; Ogledov: 678; Prenosov: 64
URL Celotno besedilo (0,00 KB)
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53.
Kakovost rdečega bora
Dušan Mlinšek, 1973

Ključne besede: rdeči bor, Pinus sylvestris L., kakovost lesa, Slovenija
DiRROS - Objavljeno: 12.07.2017; Ogledov: 612; Prenosov: 37
URL Celotno besedilo (0,00 KB)
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54.
O krhkosti krošnje pri rdečem boru (Pinus silvestris L.)
Dušan Mlinšek, 1973

Ključne besede: rdeči bor, Pinus sylvestris L., krošnja, trdota vej, kakovost lesa
DiRROS - Objavljeno: 12.07.2017; Ogledov: 704; Prenosov: 44
URL Celotno besedilo (0,00 KB)
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55.
Zveza med mladostno rastjo in obliko doraslega rdečega bora (Pinus silvestris L.)
Dušan Robič, 1973

Ključne besede: rdeči bor, Pinus sylvestris L., krošnja, rast, kakovost lesa
DiRROS - Objavljeno: 12.07.2017; Ogledov: 733; Prenosov: 42
URL Celotno besedilo (0,00 KB)
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56.
Širjenje črnega bora (Pinus nigra var. austriaca ARNOLD) na Krasu
Lojze Žgajnar, 1973

Ključne besede: črni bor, Pinus nigra, razširjenost, Kras
DiRROS - Objavljeno: 12.07.2017; Ogledov: 645; Prenosov: 45
URL Celotno besedilo (0,00 KB)
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Growth response of different tree species (oaks, beech and pine) from SE Europe to precipitation over time
Saša Orlović, Stefan Stjepanović, Bratislav Matović, Tom Levanič, Dejan Stojanović

Povzetek: Changing climatic conditions can have various consequences for forest ecosystems, from increasing frequencies of forest fires, ice and windstorm events to pathogen outbreaks and mass mortalities. The Standardized Precipitation Index (SPI) was chosen for the evaluation of drought impact on the radial growth of trees after extensive preliminary testing of various calculated monthly climate parameters from the CARPATCLIM database. SPI was calculated for periods between 3 and 36 months for different sites (lowland and mountainous parts of Serbia, Southeast Europe), from which Quercus robur, Q. cerris, Fagus sylvatica and Pinus sylvestris samples were acquired. Bootstrapped Pearson%s correlations between SPI monthly indices and radial growth of tree species were calculated. We found that 12-month SPI for summer months may be a good predictor of positive and negative growth of different species at different sites. The strongest positive correlations for five of six tree-ring width chronologies were between 12-month June and 14-month September SPI, which implies that high growth rates can be expected when the autumn of the previous year, and winter, spring and summer of the current year, are well supplied with precipitation, and vice versa (low precipitation in given period/low growth rates).
Ključne besede: standardized precipitation index, SPI, climate change, tree mortality, Quercus sp., Fagus sylvatica, Pinus sylvestris
DiRROS - Objavljeno: 18.04.2018; Ogledov: 703; Prenosov: 101
.pdf Celotno besedilo (2,91 MB)

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